Diagnostic Test

CHECK FOR POWERTRAIN CONTROL MODULE (PCM) DTCS
1. With the scan tool, read Powertrain Control Module (PCM) DTCs and record on the repair order.
  Are there any PCM Charging or Battery DTCs present?
  
  Yes
  - Repair the PCM DTC(s). Refer to DTC INDEX .
  No
  - Go To 2
CHECK FOR AN ACTIVE DTC
1. With the scan tool, read Heated Seat Module (HSM) DTCs and record on the repair order.
2. With the scan tool, erase HSM DTCs.
3. Turn the ignition off.
4. Start the engine and let run for one minute.
5. With the scan tool, read HSM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 3
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE (F921) FUSED IGNITION RUN CIRCUIT VOLTAGE
1. Turn the ignition off.
2. Disconnect the HSM C1 harness connector.
3. Start the Engine.
4. Measure the voltage between ground and the (F921) Fused Ignition circuit in the HSM C1 harness connector and compare it to the voltage of the battery.
  Is the (F921) Fused Ignition circuit voltage the same as the voltage measured at the battery?
  
  Yes
  - Go To 4.
  No
  - Repair the (F921) Fused Ignition circuit for a high voltage condition at the HSM.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (F922) FUSED IGNITION RUN CIRCUIT VOLTAGE
1. Turn the ignition off.
2. Disconnect the HSM C3 harness connector.
3. Start the Engine.
4. Measure the voltage between ground and the (F922) Fused Ignition circuit in the HSM C3 harness connector and compare it to the voltage of the battery.
  Is the (F922) Fused Ignition circuit voltage the same as the voltage measured at the battery?
  
  Yes
  - Go To 5
  No
  - Repair the (F922) Fused Ignition circuit for a high voltage condition at the HSM.
  - 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 .