Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read Comfort Seat Wheel Module (CSWM) DTCs and record on the repair order.
2. With the scan tool, erase CSWM Module DTCs.
3. Turn the ignition off for ten seconds.
4. Turn the ignition on.
5. Turn the Steering Wheel Heater on.
6. With the scan tool, read CSWM 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 BCM COMMUNICATION DTCS IN THE CSWM
Are any BCM SIGNAL INVALID or MISSING MESSAGE DTCs set in the CSWM?

Yes
- Repair the Communication DTC(s) and retest.
- Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
No
- Go To 3
CHECK THE BCM FOR LIN BUS COMMUNICATION DTCS
1. With the scan tool, read Body Control Module (BCM) DTCs and record on the repair order.
  Are there any LIN communication DTCs set in the BCM?
  
  Yes
  - Repair the DTC(s) in the BCM and retest. Refer to DIAGNOSIS AND TESTING .
  No
  - Go To 4
CHECK THE (D594) LIN BUS CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Turn the ignition off.
2. Remove the Right Steering Wheel Switch. Refer to POD, SWITCH, REMOVAL AND INSTALLATION .
3. Disconnect the Steering Column Module harness connector.
4. Measure the resistance of the (D594) LIN Bus circuit between the Right Steering Wheel Switch connector and the Steering Column Module connector.
  Is the resistance above 2.0 Ohms?
  
  Yes
  - Repair the (D594) LIN Bus circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (D594) LIN BUS CIRCUIT FOR A SHORT TO GROUND
1. Check the continuity between ground and the (D594) LIN Bus circuit.
  Is there continuity between ground and the (D594) LIN Bus circuit?
  
  Yes
  - Repair the (D594) LIN Bus for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 6
CHECK THE (D594) LIN BUS CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition on.
2. Measure the voltage on the (D594) LIN Bus circuit.
  Is there any voltage present?
  
  Yes
  - Repair the (D594) LIN Bus circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 7
CHECK DTCS AFTER REPLACING THE STEERING WHEEL
1. Turn the ignition off.
2. Replace the Steering Wheel in accordance with the Service Information. Refer to WHEEL, HEATED STEERING, REMOVAL AND INSTALLATION .
3. Turn the ignition on.
4. With the scan tool, erase CSWM DTCs.
5. Turn the ignition off for ten seconds.
6. Turn the ignition on.
7. Turn the Steering Wheel Heater on.
8. With the scan tool, read CSWM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 8
  No
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  - Test complete.
CHECK RELATED WIRING AND HARNESS CONNECTIONS
1. Turn the ignition off.
2. Check the related component and module power supply and ground circuits.
3. Disconnect the CSWM harness connector(s).
4. Disconnect all related in-line harness connections (if equipped).
5. Disconnect the related component harness connectors.
6. 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.
7. Reconnect all harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
10. With the scan tool, erase DTCs.
11. Using the recorded information along with the When Monitored and Set Conditions above, operate the vehicle within the conditions that set the DTC.
12. With the scan tool, read CSWM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the CSWM Module 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
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  - Test complete.