Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read Comfort Rear Seat Module (CRSM) DTCs and record on the repair order.
2. With the scan tool, erase CRSM DTCs.
3. Turn the ignition off for ten seconds.
4. Turn the ignition on.
5. Turn the Rear Left Seat Heater on.
6. With the scan tool, read CRSM 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 (P177) LEFT REAR SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the CRSM C1 connector.
3. Disconnect the Rear Left Seat Heater harness connector(s).
4. Check the continuity between ground and the (P177) Left Rear Seat Heater Control circuit.
  Is there continuity between ground and the (P177) Left Rear Seat Heater Control circuit?
  
  Yes
  - Repair the (P177) Left Rear Seat Heater Control circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK DTCS AFTER REPLACING THE REAR LEFT SEAT HEATER
1. Replace the Rear Left Seat Heater in accordance with the Service Information. Refer to PAD, HEATER, REMOVAL AND INSTALLATION .
2. Turn the ignition on.
3. With the scan tool, erase CRSM DTCs.
4. Turn the ignition off for ten seconds.
5. Turn the ignition on.
6. Turn the Rear Left Seat Heater on.
7. With the scan tool, read CRSM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 4
  No
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  - Test complete.
CHECK RELATED HARNESS CONNECTIONS
1. Turn the ignition off.
2. Check the related component and module power supply and ground circuits.
3. Disconnect all CRSM harness connectors.
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.
  - Check for spread terminals and 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, operate the vehicle within the conditions that set the DTC.
12. With the scan tool, read CRSM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Comfort Rear Seat Module (CRSM) 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.