Diagnostic Test

WARNING: This page is about a different car, the 2016 Dodge Durango. However, it is still accessible from the selected car via links, so may be relevant.

CHECK IF THE DTC IS ACTIVE
NOTE:
Make sure the battery is fully charged and the charging system is operating properly before proceeding.
1. Turn the ignition on.
2. Using a scan tool, record and erase Diagnostic Trouble Codes (DTCs).
3. Turn the ignition off.
4. Ignition on, engine running.
5. Turn the Heated Seat on and operate in all modes.
6. Using a scan tool, read HSM DTCs.
  Does the scan tool show this DTC as active?
  
  Yes
  - Go To 2
  No
  - Go To 5
CHECK THE RIGHT REAR SEAT CUSHION HEATER ELEMENT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Right Rear Seat Cushion Heater harness connector.
  NOTE:
  Check connectors - Clean/repair as necessary.
3. Measure the resistance between the (P178) Right Rear Seat Heater Control circuit and the (Z909) Ground circuit at the Right Rear Seat Cushion Heater connector (seat side).
  Is the resistance above 4.8 Ohms?
  
  Yes
  - Replace the Rear Seat Cushion Heater Element in accordance with the Service Information. Refer to PAD, HEATER, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (P178) RIGHT REAR SEAT HEATER CONTROL CIRCUIT FOR AN OPEN
1. Turn the ignition on.
2. Using the scan tool, actuate the rear heated seats.
3. Using a 12-volt test light connected to ground, check the (P178) Right Rear Seat Heater Control circuit at the Right Rear Seat Cushion Heater harness connector (harness side).
  NOTE:
  The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (P178) Right Rear Seat Heater Control circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z909) GROUND CIRCUIT FOR AN OPEN
1. Using a 12-volt test light connected to 12-volts, check the (Z909) Ground circuit at the Right Rear Seat Cushion Heater harness connector (harness side).
  Does the test light illuminate brightly?
  
  Yes
  - Replace the Heated Seat Module (HSM) in accordance with the Service Information. Refer to PAD, HEATER, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repair the (Z909) Ground circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors while checking for shorted and open circuits. Attempt to reproduce the condition by adjusting the seat(s).
3. Check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Verify the seat wiring harness is routed correctly to the Heated Seat Module (HSM).
4. With the scan tool, check for any Environmental Data to help identify the conditions in which the DTC was set.
5. Check Service Bulletins for any possible causes that may apply.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Test complete.