Buick Encore: Diagnostic information and procedures
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
Fastener Tightening Specifications
SCHEMATIC WIRING DIAGRAMS
STEERING WHEEL WIRING SCHEMATICS (ENCORE)
Heated Steering Wheel
Fig. 1: Heated Steering Wheel
DIAGNOSTIC INFORMATION AND PROCEDURES
SYMPTOMS - STEERING WHEEL AND COLUMN
Review the system description and operation in order to familiarize yourself
with the system functions. Refer to
Steering Wheel and Column Description and Operation.
Visual/Physical Inspection
- Inspect for aftermarket devices which could affect the operation of the
steering wheel and column.
- Inspect the easily accessible or visible system components for obvious
damage or conditions which could
cause the symptom.
Symptoms List
Refer to a symptom diagnostic procedure from the following list in order to
diagnose the symptom:
- High Telescoping Effort
- Noise in Steering Column
- Looseness in Steering Column
Heated steering wheel indicator malfunction
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.
Circuit/System Description
The heated steering wheel control module controls the heated steering wheel
and the heated steering wheel ON
indicator based on an input from the heated steering wheel switch. When the
heated steering wheel switch is
pressed, the switch signal circuit is pulled to ground. This indicates to the
heating steering wheel control module
that steering wheel heat is requested. When the request is seen, the heated
steering module supplies voltage to
the indicator lamp and supplies voltage to the heating elements, which are
internal to the steering wheel.
Reference Information
Schematic Reference
Steering Wheel 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
Steering Wheel and Column Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Circuit/System Verification
- Ignition ON.
- Press and release the S70L Steering Wheel Controls Switch - Left. The
steering wheel heater indicator
should illuminate and the left and right sides of the steering wheel should
become warm.
- The steering wheel does not become warm
Refer to Heated Steering Wheel Malfunction
- The steering wheel becomes warm and the heater indicator does not
illuminate
Refer to Circuit/System Testing
- The steering wheel becomes warm and the heater indicator illuminates
- All OK.
Circuit/System Testing
- Ignition OFF, disconnect the X2 harness connector at the K32 Heated
Steering Wheel Control Module.
- Test for less than 10 ohms between the ground terminal 2 and ground.
- Ignition OFF.
- 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
- Ignition ON.
- Verify a test lamp illuminates between the B+ terminal 1 and ground.
If the test lamp does not illuminate and the circuit fuse is good
- Ignition OFF, remove the test lamp.
- Test for less than 2 ohms in the ignition circuit end to end.
- If less than 2 ohms, verify the fuse is OK and there is voltage at the
fuse. Refer to Power
Mode Mismatch .
- If 2 ohms or greater
- Verify the in-line fuse is OK and there is voltage at the fuse.
- If the in-line fuse is blown, replace the K32 Steering Wheel Heating
Control Module.
- If the in-line fuse is OK, repair the open/high resistance in the
circuit.
If the test lamp does not illuminate and the circuit fuse is open
- Ignition OFF, remove the test lamp.
- Test for infinite resistance between the ignition circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the K32 Steering Wheel Heating Control
Module.
If the test lamp illuminates
- Ignition OFF, connect the X2 harness connector. Disconnect the X3
harness connector at the K32 heated
steering wheel control module.
- Ignition ON, test for less than 10 ohms between the ground circuit
terminal 1 and ground.
If 10 ohms or greater
- Ignition OFF.
- 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, replace the A26 HVAC Controls.
If less than 10 ohms
- Connect a test lamp between the control circuit terminal 2 and ground.
- Verify the test lamp does not illuminate with the heated steering wheel
control switch in the OFF
position.
If the test lamp illuminates
- Ignition OFF, remove the test lamp.
- Test for less than 1 V between the control circuit and ground
- If 1 V or greater, repair the short to voltage on the circuit
- If less than 1 V, replace the A26 HVAC Controls.
If the test lamp does not illuminate
- Place the heated steering wheel control switch in the ON position.
NOTE: The test lamp will illuminate very dim.
- Verify the test lamp illuminates.
If the test lamp does not illuminate
- Ignition OFF, remove the test lamp.
- Test for infinite resistance between the ignition circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance
- 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, replace the A26 HVAC Controls.
If the test lamp illuminates
- Replace the K32 Steering Wheel Heat Control Module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for heated steering wheel control module and HVAC
controls replacement,
programming, and setup.
Heated steering wheel malfunction
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
Circuit/System Description
The heated steering wheel control module controls the heated steering wheel
and the heated steering wheel ON
indicator based on an input from the heated steering wheel switch. When the
heated steering wheel switch is
pressed, the switch signal circuit is pulled to ground. This indicates to the
heating steering wheel control module
that steering wheel heat is requested. When the request is seen, the heated
steering wheel control module
supplies voltage to the indicator lamp and supplies voltage to the heating
elements, which are internal to the
steering wheel.
Diagnostic Aids
- Before replacing the steering wheel for complaints of not getting hot
enough, a reliable infrared
temperature gun should be used to measure the temperature at various points
around the rim. The steering
wheel's normal operating temperature is 32ºC (89.6ºF) and takes
approximately 10 min to reach that
temperature. It may take up to 20 min for the normal operating temperature
to stabilize within the steering wheel rim. There may be
spike in temperature during the first 3-4 min before it stabilizes at normal
operating temperature. The steering wheel will take longer to heat up if the
vehicle temperature is below -
21ºC (-5.8ºF). The steering wheel heater will not operate when the steering
wheel temperature is above
32ºC (89.6ºF).
Fig. 2: Identifying Infrared Measurement Point
- The infrared measurements are made at the rim (1) at the 3 and 9 o'clock
positions of the steering wheel.
Fig. 3: Temperature Measurement Points
- The wood sections and the stitching are not heated. Temperature
measurements should not be made on
the face (1) to insure accurate temperature readings.
Reference Information
Schematic Reference
Steering Wheel 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
Steering Wheel and Column Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Circuit/System Verification
Using an Infrared Temperature Gun
- Engine running, all accessories OFF.
- Verify the steering wheel heater switch is OFF and the steering wheel
heater indicator should not be
illuminated.
- If the heater indicator is illuminated
Refer to Heated Steering Wheel Indicator Malfunction
- If the heater indicator is not illuminated
Fig. 4: Steering Wheel Rim Measurement Point
NOTE: The Infrared Temperature Gun should be within 50.8mm (2 in)
and parallel
to the steering wheel rim when taking temperature readings.
- Measure the temperature readings at the 3 and 9 o'clock positions on the
steering wheel rim (1).
- Verify that the steering wheel temperature is 25ºC (77ºF) or below.
- If the steering wheel temperature is greater than 25ºC (77ºF)
Allow the steering wheel to cool before proceeding to next step.
- If the steering wheel temperature is 25ºC (77ºF) or below
- Press and release the steering wheel heater switch. The steering wheel
heater indicator should illuminate.
Allow the steering wheel to heat for a minimum of 10 min so that the
temperature stabilizes.
- If the heater indicator does not illuminate
Refer to Heated Steering Wheel Indicator Malfunction
- If the heater indicator illuminates
Fig. 5: Steering Wheel Rim Measurement Point
NOTE: The Infrared Temperature Gun should be within 50.8mm (2 in)
and parallel
to the steering wheel rim when taking temperature readings.
- Measure the temperature readings at the 3 and 9 o'clock positions on the
steering wheel rim (1).
- Verify that the steering wheel temperature is greater than 28ºC (82.4ºF)
within 20 min.
- If after 20 minutes the measured temperature is less than 28ºC
(82.4ºF)
Refer to Circuit System Testing.
- If after 20 minutes the measured temperature is 28ºC (82.4ºF) or
greater
- All OK.
Circuit/System Testing
- Ignition OFF, disconnect the X2 harness connector at the K32 Heated
Steering Wheel Control Module.
- Test for less than 10 ohms between the ground terminal 2 and ground.
If 10 ohms or greater
- Ignition OFF.
- 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
- Ignition ON.
- Verify a test lamp illuminates between the B+ terminal 1 and ground.
If the test lamp does not illuminate and the circuit fuse is good
- Ignition OFF, remove the test lamp.
- Test for less than 2 ohms in the ignition circuit end to end.
- If less than 2 ohms, verify the fuse is OK and there is voltage at the
fuse. Refer to Power
Mode Mismatch .
- If 2 ohms or greater
- Verify the in-line fuse is OK and there is voltage at the fuse.
- If the in-line fuse is blown, replace the K32 Steering Wheel Heating
Control Module.
- If the in-line fuse is OK, repair the open/high resistance in the
circuit.
If the test lamp does not illuminate and the circuit fuse is open
- Ignition OFF, remove the test lamp.
- Test for infinite resistance between the ignition circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance, replace the K32 Steering Wheel Heating Control
Module.
If the test lamp illuminates
- Ignition OFF, connect the X2 harness connector. Disconnect the X3
harness connector at the K32 heated
steering wheel control module.
- Ignition ON, test for less than 10 ohms between the ground circuit
terminal 1 and ground.
If 10 ohms or greater
- Ignition OFF.
- 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, replace the A26 HVAC Controls.
If less than 10 ohms
- Connect a test lamp between the control circuit terminal 2 and ground.
- Verify the test lamp does not illuminate with the heated steering wheel
control switch in the OFF
position.
If the test lamp illuminates
- Ignition OFF, remove the test lamp.
- Test for less than 1 V between the control circuit and ground
- If 1 V or greater, repair the short to voltage on the circuit
- If less than 1 V, replace the A26 HVAC Controls.
If the test lamp does not illuminate
- Place the heated steering wheel control switch in the ON position.
NOTE: The test lamp will illuminate very dim.
- Verify the test lamp illuminates.
If the test lamp does not illuminate
- Ignition OFF, remove the test lamp.
- Test for infinite resistance between the ignition circuit and ground.
- If less than infinite resistance, repair the short to ground on the
circuit.
- If infinite resistance
- 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, replace the A26 HVAC Controls.
If the test lamp illuminates
- Ignition OFF, test for less than 10 ohms between the ground circuit
listed below and ground.
- Terminal B X1 on the module harness side
- Terminal D X1 on the module harness side
- Ignition OFF.
- 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
- Test for 6000-35000 ohms between the signal terminal A X1 and the ground
terminal B X1 on the heated
steering wheel harness side.
If not within the specified range
Replace the E15 Steering Wheel Heater.
If within the specified range
- Test for 1.5-3.0 ohms between the control circuit terminal C X1 and the
ground terminal D X1 on the
heated steering wheel harness side.
If not within the specified range
Replace the E15 Steering Wheel Heater.
If within the specified range
- Replace the K32 Steering Wheel Heat Control Module.
Component Testing
Heated Steering Wheel
- Ignition OFF, disconnect the X1 harness connector at the heated steering
wheel.
- Test for 6000-35000 ohms between the signal terminal A and the ground
terminal B.
If not within the specified range
Replace the E15 Steering Wheel Heater.
- Test for 1.5-3.0 ohms between the control circuit terminal C and the
ground terminal D.
If not within the specified range
Replace the E15 Steering Wheel Heater.
If within the specified range
- All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for heated steering wheel control module and HVAC
controls replacement,
programming, and setup.
HIGH TELESCOPING EFFORT
NOISE IN STEERING COLUMN
Noise in Steering Column
LOOSENESS IN STEERING COLUMN
Looseness in Steering Column
READ NEXT:
Intermediate steering shaft upper seal replacement
Fig. 6: Intermediate Steering Shaft Upper Seal
Intermediate Steering Shaft Upper Seal Replacement
INTERMEDIATE STEERING SHAFT REPLACEMENT (NJ1)
STEERING WHEEL AND COLUMN DESCRIPTION AND OPERATION
The steering wheel and column has 4 primary functions:
Vehicle steering
Vehicle security
Driver convenience
Driver safety
Vehicle Steering
The
SEE MORE:
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
Fastener Tightening Specifications
SCHEMATIC WIRING DIAGRAMS
ANTILOCK BRAKE SYSTEM WIRING SCHEMATICS (ENCORE)
Module Power, Ground and Subsystem References
Fig. 1: Module Power, Ground and Subsystem References
Wheel Speed Sensors
Fig. 2: Wheel
STRUCTURE IDENTIFICATION
Fig. 13: Front Structure
View Front
Fig. 14: Rear Structure
View Rear