Diagnostic Test

1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
2. With the scan tool, run a vehicle Scan Report, or record the Environmental Data related to the DTCs.
3. With the scan tool, erase all DTCs.
4. Turn the ignition off for a minimum of 10 seconds.
5. Start the Engine.
6. Using the recorded Environmental Data and the When Monitored Conditions, operate the vehicle in the conditions that set the DTC.
7. With the scan tool, read CSWM DTCs.

Is the same DTC active?

Yes 

• Go To  2

No 

• Perform the appropriate INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .

1. Turn the ignition off.
2. Disconnect the CSWM C4 harness connector.
3. Start the engine.
4. Measure the voltage of the (C91) Heated Steering Wheel Feed circuit at the CSWM C4 harness connector.
5. Measure the voltage of the (C986) Heated Steering Wheel Return circuit at the CSWM C4 harness connector.

Is there voltage present on either circuit?

Yes 

• Go To  3

No 

• Go To  6

1. Remove the Driver Airbag in accordance with the Service Information. Refer to AIR BAG, DRIVER, REMOVAL AND INSTALLATION .
2. Disconnect the SCCM C1 harness connector.
   WARNING:

   Turn the ignition on, then reconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

3. Start the engine.
4. Measure the voltage of the (C91) Heated Steering Wheel Feed circuit at the SCCM C1 harness connector.
5. Measure the voltage of the (C986) Heated Steering Wheel Return circuit at the SCCM C1 harness connector.
   NOTE:

   When probing a circuit at an Electronic Control Unit (ECU) connector, always use an appropriate probing tool to prevent any possible damage to the ECU terminals.

   Is there voltage present on either circuit?

   Yes 

   • Repair the circuit(s) for a short to voltage.
   • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

   No 

   • Go To  4

1. Turn the ignition off.
2. Disconnect the SCCM C4 harness connector.
3. Start the engine.
4. Measure the voltage of the (C91) Heated Steering Wheel Feed circuit at either SCCM component connector.
5. Measure the voltage of the (C986) Heated Steering Wheel Return circuit at either SCCM component connector.

Is there voltage present on either circuit?

Yes 

• Replace the Steering Column Control Module (SCCM) in accordance with the Service Information. Refer to MODULE, STEERING COLUMN CONTROL (SCCM), REMOVAL AND INSTALLATION .
• Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

No 

• Go To  5

1. Turn the ignition off.
2. Disconnect the HSW harness connector.
3. Start the engine.
4. Measure the voltage of the (C91) Heated Steering Wheel Feed circuit at the HSW harness connector.
5. Measure the voltage of the (C986) Heated Steering Wheel Return circuit at the HSW harness connector.

Is there voltage present on either circuit?

Yes 

• Repair the circuit(s) for a short to voltage.
• Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

No 

• Replace the Heated Steering Wheel (HSW) in accordance with the Service Information. Refer to WHEEL, STEERING, REMOVAL AND INSTALLATION .
• Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

1. Turn the ignition off.
2. Disconnect all CSWM harness connectors.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
   • Proper connector installation.
   • Damaged connector locks.
   • Corrosion.
   • Other signs of water intrusion.
   • Weather seal damage (if equipped).
   • Bent terminals.
   • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
   • Terminals that have been pushed back into the connector cavity.
   • Perform a terminal drag test on each connector terminal to verify proper terminal tension.

   Repair any conditions that are found.

6. Reconnect all CSWM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase DTCs.
10. Turn the ignition off for a minimum of 10 seconds.
11. Start the Engine.
12. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
13. With the scan tool, read CSWM DTCs.
    NOTE:

    The HSW must be turned off when checking for this short to voltage DTC.

    Is the same DTC active?

    Yes 

    • Replace the Comfort Seat Wheel Module (CSWM) in accordance with the Service Information. Refer to MODULE, COMFORT SEAT AND WHEEL (CSWM), REMOVAL AND INSTALLATION .
    • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

    No 

    • Repairing the wiring harness or connections corrected the problem.
    • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .