Buick Encore Owners & Service Manuals

Buick Encore: Diagnostic information and procedures

Buick Encore 2012-2019 Service Manual / HVAC & Restraints / Seat Belts / Diagnostic information and procedures

Seat belt system operational and functional checks

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

Fastener Tightening Specifications

Fastener Tightening Specifications

SCHEMATIC WIRING DIAGRAMS

SEAT BELT WIRING SCHEMATICS (ENCORE)

Switches and Indicator

Fig. 1: Switches and Indicator
Fig. 1: Switches and Indicator

SEAT BELT WIRING SCHEMATICS (Encore)

Switches, Sensor, and Indicator

Fig. 2: Switches, Sensor, and Indicator
Fig. 2: Switches, Sensor, and Indicator

DIAGNOSTIC INFORMATION AND PROCEDURES

SEAT BELT SYSTEM OPERATIONAL AND FUNCTIONAL CHECKS

NOTE: If the vehicle has been in a collision, refer to Repairs and Inspections Required After a Collision for additional information.

Perform the following inspection from the driver seat:

  1. Turn the ignition switch to the ON position. Verify proper operation of the seat belt reminder lamp with the belt buckled and with the belt unbuckled.
  2. Inspect the shoulder belt guide in order to ensure that the following conditions are met:
  • The shoulder belt guide swivels freely.
  • The seat belt webbing is seated flat in the guide slot.
  • The seat belt webbing does not bind.
  1. Verify that the seat belt buckle faces inboard and is accessible.
  2. Verify that the seat belt retractor units are securely attached.
  3. Verify that the seat belt anchor bolts are secure.
  4. Fully extend the seat belt webbing. Verify that the seat belt webbing does not have any twists or tears.
  5. Allow the seat belt webbing to retract. Verify that the seat belt webbing returns freely and completely back into the retractor. If the seat belt webbing will not retract, refer to Seat Belt Does Not Retract.
  6. Snap the seat belt latch plate into the buckle.
  7. Sharply tug on the seat belt latch plate and the buckle. Verify that the seat belt latch plate and the buckle remain locked when tugged.
  8. Push the button on the buckle:
  • Verify that the seat belt latch plate releases easily from the buckle.
  • Verify that the button returns to its original position.

Perform the following inspection procedure from the passenger seat.

  1. Verify the automatic locking retractor (ALR) feature operates properly by performing the following checks:

  1. Pull the seat belt all the way out of the retractor until it stops.
  2. Slowly allow the belt to retract partially, while listening for a ratcheting sound.
  3. Sharply tug on the belt ensuring that the retractor lock sets and does not allow the belt to be pulled from the retractor.
  4. After performing steps 1.1 through 1.3 ensure the belt fully retracts.
  1. Repeat the inspection procedure steps 2 through 10 from the passengers seat.

Perform the following steps in order to inspect the left and right rear seat belts:

  1. Inspect the shoulder belt guide in order to ensure that the following conditions are met:
  • The seat belt webbing is seated flat in the guide slot.
  • The seat belt webbing does not bind.
  1. Verify that the seat belt buckle is accessible.
  2. Verify that the seat belt retractor units are securely attached.
  3. Verify that the seat belt anchor bolts are secure.
  4. Fully extend the seat belt webbing. Verify that the seat belt webbing does not have any twists or tears.
  5. Allow the seat belt webbing to retract. Verify that the seat belt webbing returns freely and completely back into the retractor.
  6. Snap the seat belt latch plate into the buckle.
  7. Sharply tug on the seat belt latch plate and the buckle. Verify that the seat belt latch plate and the buckle remain locked when tugged.
  8. Push the button on the buckle:
  • Verify that the seat belt latch plate releases easily from the buckle.
  • Verify that the button returns to its original position.

Emergency Locking Retractors

WARNING: Perform this test in an area clear of other vehicles or obstructions. Do not conduct this test on the open road. A large, empty parking lot is suitable.

Failure to observe this precaution may result in damage to the vehicle and possible personal injury.

  1. Fasten the seat belts, an assistant is needed when the retractor under test is not part of the driver seat belt.
  2. Accelerate the vehicle slowly to 16 km/h (10 mph) and apply the brakes firmly.
  3. Verify that the seat belt locks when braking firmly.

NOTE: When performing this check, note the position that the retractors are mounted. Some retractors are not mounted at a zero degree inclination.

  1. If the belt does not lock, proceed with the following steps:
  1. Remove the seat belt retractor assembly.
  2. Tilt the seat belt retractor slowly.

Fig. 3: Checking Seat Belt Retractor Inclination
Fig. 3: Checking Seat Belt Retractor Inclination

  1. Ensure that the seat belt webbing can be pulled from the retractor at an inclination of 15 degrees forward or less, from the retractors mounted position.
  2. Ensure the retractor cannot be pulled from the retractor at an inclination of 45 degrees forward or more.
  3. If a seat belt retractor does not operate as described, replace the retractor assembly.

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

DTC B0072 OR B0073: Seat belt switch

Diagnostic Instructions

  • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
  • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
  • Diagnostic Procedure Instructions provides an overview of each diagnostic category

DTC Descriptors

DTC B0072

Driver Seat Belt Switch Circuit

DTC B0073

Passenger Seat Belt Switch Circuit

For symptom byte information refer to Symptom Byte List .

Diagnostic Fault Information

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

The inflatable restraint seat belt buckle switch is within the seat belt buckle and provides an input to the inflatable restraint sensing and diagnostic module (SDM). The inflatable restraint sensing and diagnostic module supplies a low reference circuit and a seat belt switch signal circuit to determine a buckled or unbuckled condition. The inflatable restraint sensing and diagnostic module monitors the seat belt switch circuits and if a fault is detected a DTC will be set.

Conditions for Running the DTC

Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

B0072 01 or B0073 01

The seat belt switch circuit is shorted to voltage.

B0072 02 or B0073 02

The seat belt switch circuit is shorted to ground.

B0072 04 or B0073 03

The seat belt switch circuit is open.

B0072 05 or B0073 05

The seat belt switch circuit is shorted to voltage or open.

B0072 06 or B0073 06

The seat belt switch circuit is shorted to ground or open.

B0072 08 or B0073 08

The seat belt switch signal is invalid.

B0072 0B or B0073 0B

The seat belt switch signal is above threshold.

B0072 0C or B0073 0C

The seat belt switch signal is below threshold

Action Taken When the DTC Sets

The inflatable restraint sensing and diagnostic module will store a DTC and illuminate the air bag indicator in the instrument cluster.

Conditions for Clearing the DTC

The condition for setting the DTC no longer exists.

Reference Information

Schematic Reference

Seat Belt Schematics (Encore), Seat Belt Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Supplemental Inflatable Restraint System Description and Operation

Electrical Information Reference

  • Circuit Testing
  • Testing for Intermittent Conditions and Poor Connections
  • Wiring Repairs
  • Connector Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Ignition ON.
  2. Verify the appropriate scan tool Seat Belt Status parameter changes between Buckled and Unbuckled when the seat belt is buckled and unbuckled.

If the parameter does not change

Refer to Circuit/System Testing.

If the parameter changes

  1. All OK.

Circuit/System Testing

NOTE: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

  • B153D Seat Belt Buckle-Driver
  • B153P Seat Belt Buckle-Passenger
  • K36 Inflatable Restraint Sensing and Diagnostic Module
  1. Ignition OFF. Scan tool disconnected. Disconnect the harness connector at the appropriate B153 Seat Belt Buckle. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 5 ohms between the low reference circuit terminal 2 and ground.

If 5 ohms or greater

  1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for less than 2 ohms in the low reference circuit end to end.
  • If 2 ohms or greater, repair the open/high resistance in the circuit.
  • If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If less than 5 ohms

  1. Ignition ON.
  2. Verify the appropriate scan tool Seat Belt Status parameter is Buckled.

If not Buckled

  1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for infinite resistance between the signal circuit terminal 1 and ground.
  • If less than infinite resistance, repair the short to ground on the circuit.
  • If infinite resistance, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If Buckled

  1. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
  2. Verify the appropriate scan tool Seat Belt Status parameter is Unbuckled.

If not Unbuckled

  1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON.
  2. Test for less than 1 V between the signal circuit and ground.
  • If 1 V or greater, repair the short to voltage on the circuit.
  • If less than 1 V
  1. Test for less than 2 ohms in the signal circuit end to end.
  • If 2 ohms or greater, repair the open/high resistance in the circuit.
  • If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If Unbuckled

  1. Test or replace the B153 Seat Belt Buckle.

Component Testing

  1. Ignition OFF. Scan tool disconnected. Disconnect the harness connector at the appropriate B153 Seat Belt Buckle. It may take up to 2 min for all vehicle systems to power down.
  2. Test for infinite resistance between the signal terminal 1 and the low reference terminal 2.

If less than infinite resistance

Replace the B153 Seat Belt Buckle.

If infinite resistance

  1. Insert the seat belt into the buckle.
  2. Test for less than 5 ohms between the signal terminal 1 and the low reference terminal 2.

If 5 ohms or greater

Replace the B153 Seat Belt Buckle.

If less than 5 ohms

  1. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

  • Front Seat Belt Buckle Replacement
  • Control Module References for inflatable restraint sensing and diagnostic module replacement, programming, and setup.

DTC B059A: Seat belt indicator circuit

Diagnostic Instructions

  • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure
  • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
  • Diagnostic Procedure Instructions provides an overview of each diagnostic category

DTC Descriptors

DTC B059A 01

Passenger Seat Belt Indicator Circuit Short to Battery

DTC B059A 02

Passenger Seat Belt Indicator Circuit Short to Ground

DTC B059A 04

Passenger Seat Belt Indicator Circuit Open

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

The Inflatable Restraint Sensing and Diagnostic Module (SDM) monitors the passenger seat status and the passenger seat belt buckle switch and provides an output to the passenger seat belt indicator. When the Inflatable Restraint Sensing and Diagnostic Module detects the passenger seat is occupied and the seat belt is not fastened, the Inflatable Restraint Sensing and Diagnostic Module supplies a pulse width modulated signal to control the passenger seat belt indicator circuit. The Inflatable Restraint Sensing and Diagnostic Module monitors the passenger seat belt indicator circuits and if a fault is detected a DTC will be set.

Conditions for Running the DTC

Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

B059A 01

The passenger seat belt indicator circuit is shorted to voltage.

B059A 02

The passenger seat belt indicator circuit is shorted to ground.

B059A 04

The passenger seat belt indicator circuit is open.

Action Taken When the DTC Sets

The Inflatable Restraint Sensing and Diagnostic Module will store the DTC.

Conditions for Clearing the DTC

The condition for setting the DTC no longer exists.

Reference Information

Schematic Reference

Seat Belt Schematics (Encore), Seat Belt Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Seat Belt System Description and Operation

Electrical Information Reference

  • Circuit Testing
  • Testing for Intermittent Conditions and Poor Connections
  • Wiring Repairs
  • Connector Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

NOTE: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

  • P14 Passenger Air Bag Disable Indicator
  • K36 Inflatable Restraint Sensing and Diagnostic Module
  1. Ignition OFF, disconnect the harness connector at the P14 Passenger Air Bag Disable Indicator.
  2. Test for less than 10 ohms between the ground circuit terminal 1 and ground.

If 10 ohms or greater

  1. Ignition OFF.
  2. Test for less than 2 ohms in the ground circuit end to end.
  • If 2 ohms or greater, repair the open/high resistance in the circuit.
  • If less than 2 ohms, repair the open/high resistance in the ground connection.

If less than 10 ohms

  1. Connect a test lamp between the control circuit terminal 4 and ground, ignition ON.
  2. Verify the test lamp turns OFF and ON when the passenger seat belt is buckled and unbuckled.

If the test lamp is always on

  1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON.
  2. Test for less than 1 V between the signal circuit and ground.
  • If 1V or greater, repair the short to voltage on the circuit.
  • If less than 1V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If the test lamp is always off

  1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for infinite resistance between the seat belt switch signal circuit terminal 45 and ground.
  • If less than infinite resistance, repair the short to ground on the circuit.
  • If infinite resistance
  1. Test for less than 2 ohms in each control circuit end to end.
  • If 2 ohms or greater, repair the open/high resistance in the circuit.
  • If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module

If test lamp turns on and off while changing between the commanded states

  1. Test or replace the P14 Passenger Air Bag Disable Indicator

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

  • Instrument Panel Airbag Arming Status Display Replacement (Encore) , Instrument Panel Airbag Arming Status Display Replacement (Encore) for passenger air bag disable indicator replacement
  • Control Module References for Inflatable Restraint Sensing and Diagnostic Module replacement, programming, and setup

Symptoms - seat belts

NOTE: Review the seat belt system description and operation in order to familiarize yourself with the system and how it functions. Refer to Seat Belt System Description and Operation.

Visual/Physical Inspection

  • Inspect for aftermarket devices which could affect the operation of the seat belt system. Refer to Checking Aftermarket Accessories .
  • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to the following symptom diagnostic procedure in order to diagnose the symptom

Seat Belt Indicator Malfunction - Driver

SEAT BELT DOES NOT RETRACT

  1. Grab the seat belt webbing and slowly and firmly extract 15-25 mm (5/8-1 in) of webbing from the seat belt.
  2. Release the seat belt and allow the webbing to slowly retract back into the retractor.
  3. Check to see if the seat belt is released. If the seat belt is not released, repeat steps 1 and 2, two times more.
  4. If the retractor does not release after repeating the steps, replace with a new retractor.

SEAT BELT INDICATOR MALFUNCTION - DRIVER

Diagnostic Instructions

  • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
  • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
  • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

The driver seat belt switch is a 2-wire switch wired to the Inflatable Restraint Sensing and Diagnostic Module (SDM) using a signal circuit and a low reference circuit. When the seat belt is unbuckled the switch is closed, and when the seat belt is buckled the switch is open. The Inflatable Restraint Sensing and Diagnostic Module sends the status of the driver seat belt via serial data to the instrument cluster. After receiving the message, the instrument cluster controls the illumination of the driver seat belt indicator.

Reference Information

Schematic Reference

Seat Belt Schematics (Encore), Seat Belt Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Seat Belt System Description and Operation

Electrical Information Reference

  • Circuit Testing
  • Connector Repairs
  • Testing for Intermittent Conditions and Poor Connections
  • Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Verify the driver seat belt indicator turns ON and OFF when commanding the instrument cluster all indicators ON and OFF with a scan tool.
  • If the driver seat belt indicator does not turn ON and OFF as commanded .

Replace the P16 Instrument Cluster.

  • If the driver seat belt indicator does turn ON and OFF as commanded
  1. Verify the scan tool Diver Seat Belt Switch parameter changes between Buckled and Unbuckled when buckling and unbuckling the driver seat belt.

If the parameter does not change

Refer to Circuit/System Testing.

If the parameter changes

  1. All OK.

Circuit/System Testing

NOTE: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

  • B153D Seat Belt Buckle-Driver
  • Seat belt switch harness connector
  • K36 Inflatable Restraint Sensing and Diagnostic Module
  • Inflatable Restraint Sensing and Diagnostic Module wiring harness connector
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B153D Seat Belt Buckle-Driver. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 ohms between the low reference circuit terminal 2 and ground.

If 5 ohms or greater

  1. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for less than 2 ohms in each low reference circuit end to end.
  • If 2 ohms or greater, repair the open/high resistance in the circuit.
  • If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If less than 5 ohms

  1. Ignition ON.
  2. Verify the scan tool Driver Seat Belt Status parameter is Buckled.

If not Buckled

  1. Ignition OFF, disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for infinite resistance between the seat belt switch signal circuit terminal 1 and ground.
  • If less than infinite resistance, repair the short to ground on the circuit.
  • If infinite resistance, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If Buckled

  1. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
  2. Verify the scan tool Driver Seat Belt Status parameter is Unbuckled.

If Unbuckled

  1. Ignition OFF, disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON.
  2. Test for less than 1 V between the signal circuit and ground.
  • If 1 V or greater, repair the short to voltage on the circuit.
  • If less than 1 V
  1. Test for less than 2 ohms in each circuit end to end.
  • If 2 ohms or greater, repair the open/high resistance in the circuit.
  • If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module

If Unbuckled

  1. Test or replace the B153D Seat Belt Buckle-Driver.

Component Testing

  1. Ignition OFF, disconnect the harness connector at the B153D Seat Belt Buckle-Driver, buckle the driver seat belt.
  2. Test for infinite resistance between the signal circuit terminal 1 and the low reference terminal 2.

If not infinite resistance

Replace the B153D Seat Belt Buckle-Driver.

If infinite resistance

  1. Unbuckle the driver seat belt.
  2. Test for less than 1 ohms between the signal circuit terminal 1 and the low reference terminal 2.

If 1 ohms or greater

Replace the B153D Seat Belt Buckle-Driver.

If less than 1 ohms

  1. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Front Seat Belt Buckle Replacement

  • Control Module References for Inflatable Restraint Sensing and Diagnostic Module or instrument cluster replacement, programming and setup

Seat belt indicator malfunction - passenger

Diagnostic Instructions

  • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
  • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
  • Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Diagnostic Fault Information

Circuit/System Description

When an individual is sitting in the passenger seat the passenger presence sensor detects the individual. A signal to the Inflatable Restraint Sensing and Diagnostic Module indicates a person is in the passenger seat. The Inflatable Restraint Sensing and Diagnostic Module will turn the passenger seat belt indicator. The passenger seat belt switch is a 2-wire switch wired to the Inflatable Restraint Sensing and Diagnostic Module using a signal circuit and a low reference circuit. When the seat belt is unbuckled the switch is closed, and when the seat belt is buckled the switch is open. The Inflatable Restraint Sensing and Diagnostic Module sends the status of the passenger seat belt via a hard wire to the passenger air bag disable indicator. After receiving the message, the passenger air bag disable indicator controls the illumination of the passenger seat belt indicator

Diagnostic Aids

Objects on the passenger seat can cause the passenger seat belt reminder to be commanded on. Depending on the sensing technology used, a conductive object (computers, MP3 players, cell phones, diagnostic scan tool, wires, a hand, etc.) placed on the passenger seat may cause the Passenger Presence Detection Module to command the passenger air bag indicator ON and/or command the passenger seat belt indicator ON. The fasten seat belt chime will also sound.

Reference Information

Schematic Reference

Seat Belt Schematics (Encore), Seat Belt Schematics (Encore)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - Encore

Description and Operation

Seat Belt System Description and Operation

Electrical Information Reference

  • Circuit Testing
  • Connector Repairs
  • Testing for Intermittent Conditions and Poor Connections
  • Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Ignition ON.
  2. Verify the passenger seat belt indicator turns ON and OFF when commanding the Passenger Seat Belt Reminder Indicator with a scan tool.

If the passenger seat belt indicator does not turn ON and OFF

Refer to Seat Belt Indicator Malfunction in Circuit/System Testing.

If the passenger seat belt indicator turns ON and OFF

  1. Verify the scan tool Passenger Seat Belt Status parameter changes between Buckled and Unbuckled when buckling and unbuckling the seat belt.

If the parameter does not change between Buckled and Unbuckled when buckling and unbuckling the seat belt

Refer to Seat Belt Switch Malfunction in Circuit/System Testing.

If the parameter changes between Buckled and Unbuckled when buckling and unbuckling the seat belt

  1. All OK.

Circuit/System Testing

Passenger Seat Belt Switch Malfunction

  1. Ignition OFF. Disconnect the harness connector at the B153P Seat Belt Buckle-Passenger.
  2. Test for less than 5 ohms between the low reference circuit terminal 2 and ground.

If 5 ohms or greater

  1. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for less than 2 ohms in each control circuit end to end.
  • If 2 ohms or greater, repair the open/high resistance in the circuit.
  • If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
  • If less than 5 ohms
  1. Ignition ON.
  2. Verify the scan tool Passenger Seat Belt Status parameter listed below is Buckled.

If not Buckled

  1. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for infinite resistance between the seat belt switch signal circuit terminal 1 and ground.
  • If less than infinite resistance, repair the short to ground on the circuit.
  • If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If Buckled

  1. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
  2. Verify the scan tool Passenger Seat Belt Status parameter is Unbuckled

If not Unbuckled

  1. Ignition OFF. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module. Ignition ON.
  2. Test for less than 1 V between the signal circuit and ground.

If 1 V or greater, repair the short to voltage on the circuit.

  1. Test for less than 2 ohms in each circuit end to end.
  • If 2 ohms or greater, repair the open/high resistance in the circuit.
  • If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module

If Unbuckled

  1. Test or replace the B153P Seat Belt Buckle-Passenger.

Passenger Seat Belt Indicator Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the P14 Passenger Air Bag Disable Indicator.
  2. Test for less than 10 ohms between the ground circuit terminal 4 and ground.

If 10 ohms or greater

  1. Ignition OFF.
  2. Test for less than 2 ohms in the ground circuit end to end.
  • If 2 ohms or greater, repair the open/high resistance in the circuit.
  • If less than 2 ohms, repair the open/high resistance in the ground connection.

If less than 10 ohms

  1. Ignition ON. With a scan tool, command the Passenger Seat Belt Reminder Indicator OFF.
  2. Test for less than 11 V between the control circuit terminal 6 and ground.

If 11 V or greater

  1. Ignition OFF. Disconnect the X1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module. Ignition ON.
  2. Test for less than 1 V between the control circuit terminal 6 and ground.
  • If 1 V or greater, repair the short to voltage on the circuit.
  • If less than 1 V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If less than 11 V

  1. With a scan tool, command the Passenger Seat Belt Reminder Indicator ON.
  2. Test for greater than 4 V between the control circuit terminal 6 and ground.

If 4 V or less

  1. Ignition OFF. Disconnect the X 1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  2. Test for infinite resistance between the control circuit terminal 6 and ground.
  • If less than infinite resistance, repair the short to ground on the circuit.
  1. Test for less than 2 ohms between the control circuit terminal 6 and ground.
  • If 2 ohms or greater repair the open/high resistance in the circuit.
  • If less than 2 ohms replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If greater than 4 V

  1. Replace the P14 Passenger Air Bag Disable Indicator.

Component Testing

  1. Ignition OFF. Disconnect the harness connector at the B153P Seat Belt Buckle-Passenger. Buckle the B153P Seat Belt Buckle-Passenger.
  2. Test for infinite resistance between the signal circuit terminal 1 and the low reference terminal 2 at the B153P Seat Belt Buckle-Passenger.

If less than infinite resistance

Replace the B153P Seat Belt Buckle-Passenger

If infinite resistance

  1. Unbuckle the B153P Seat Belt Buckle-Passenger.
  2. Test for less than 1 ohms between the signal circuit terminal 1 and the low reference terminal 2 at the B153P Seat Belt Buckle-Passenger.

If 1 ohms or greater

Replace the B153P Seat Belt Buckle-Passenger.

If less than 1 ohms

  1. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

  • Front Seat Belt Buckle Replacement
  • Instrument Panel Airbag Arming Status Display Replacement (Encore) , Instrument Panel Airbag Arming Status Display Replacement (Encore)
  • Control Module References for Inflatable Restraint Sensing and Diagnostic Module and Instrument Cluster replacement, programming and setup

SEAT BELT SERVICE PRECAUTIONS

NOTE: If the vehicle has been in a collision, refer to Repairs and Inspections Required After a Collision for additional information.

Do not bleach or dye the seat belt webbing. Use only the following items in order to clean the seat belt webbing:

  • A mild soap and water solution
  • A soft brush or cloth
  • Keep sharp edges and damaging objects away from the seat belts. Avoid bending or damaging any part of the seat belt buckle or the latch plate. Replace any seat belts which are cut or damaged in any way.
  • Use only the correct seat belt anchor bolts/screws and tighten the anchor bolts/screws to the correct torque value. Refer to Fastener Tightening Specifications. When installing seat belt anchor bolts, start the bolt by hand to ensure that the bolt is threaded straight.
  • Some seat belts and retractors require service as a set, with service replacement parts only. Do not attempt to repair to individual components that require service as a set.
  • Verify that the replacement part number is correct for the vehicle at that seating position. Do not substitute a seat belt from a different seating position.

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