Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read Heated Seat Module (HSM) DTC(s) and record on the work order.
2. With the scan tool, erase HSM DTCs.
3. Turn the ignition off.
4. Start the engine.
5. Turn the Heated Steering Wheel (HSW) on.
6. With the scan tool, read HSM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE (C91) HEATED STEERING WHEEL FEED CIRCUIT FOR AN OPEN OR HIGH RESISTANCE BETWEEN SCCM AND HSM
WARNING:
Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
1. Remove the Driver Airbag in accordance with the Service Information. Refer to AIR BAG, DRIVER, REMOVAL .
2. Disconnect the SCCM C1 harness connector.
3. Disconnect the HSM C4 harness connector.
4. Measure the resistance of the (C91) Heated Steering Wheel Feed circuit between the SCCM C1 harness connector and the HSM C4 harness connector.
  Is the resistance below 1.0 Ohm?
  
  Yes
  - Go To 3
  No
  - Repair the (C91) Heated Steering Wheel Feed circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (C986) HEATED STEERING WHEEL RETURN CIRCUIT FOR AN OPEN OR HIGH RESISTANCE BETWEEN SCCM AND HSM
1. Measure the resistance of the (C986) Heated Steering Wheel Return circuit between the SCCM C1 harness connector and the HSM C4 harness connector.
  Is the resistance below 1.0 Ohm?
  
  Yes
  - Go To 4
  No
  - Repair the (C986) Heated Steering Wheel Return circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE HEATED STEERING WHEEL ELEMENT RESISTANCE
1. Disconnect the SCCM C2 harness connector.
2. Thoroughly inspect the wiring harness and connectors between the HSW and the Steering Control Module. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals and repair as necessary.
3. Measure the resistance of the HSW between the (C91) Heated Steering Wheel Feed circuit and the (C986) Heated Steering Wheel Return circuit at the SCCM C2 harness connector.
  Is the resistance 1.85 ± 0.2 Ohms?
  
  Yes
  - Go To 5
  No
  - Replace the Heated Steering Wheel (HSW) in accordance with the Service Information. Refer to WHEEL, STEERING, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (C91) HEATED STEERING WHEEL FEED CIRCUIT FOR AN OPEN OR HIGH RESISTANCE IN THE SCCM
1. Reconnect the SCCM C1 harness connector.
2. Measure the resistance of the (C91) Heated Steering Wheel Feed circuit between the SCCM C2 component connector and the HSM C4 harness connector.
  Is the resistance below 1.0 Ohm?
  
  Yes
  - Go To 6
  No
  - Replace the Steering Column Control Module (SCCM) in accordance with the Service Information. Refer to MODULE, STEERING COLUMN CONTROL (SCCM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (C986) HEATED STEERING WHEEL RETURN CIRCUIT OPEN FOR AN OPEN OR HIGH RESISTANCE IN THE SCCM
1. Measure the resistance of the (C986) Heated Steering Wheel Return circuit between the SCCM C2 component connector and the HSM C4 harness connector.
  Is the resistance below 1.0 Ohm?
  
  Yes
  - Go To 7
  No
  - Replace the Steering Column Control Module (SCCM) in accordance with the Service Information. Refer to MODULE, STEERING COLUMN CONTROL (SCCM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all HSM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. 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.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
5. Connect all HSM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Connect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
10. With the scan tool, read HSM DTCs.
  Is the same DTC active?
  
  Yes
  - Replace the Heated Seat Module (HSM) in accordance with the Service Information. Refer to MODULE, HEATED SEAT (HSM), REMOVAL .
  - 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 .