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:
Before proceeding, verify the battery is fully charged, the charging system is operating properly, no Battery or System voltage Diagnostic Trouble Codes (DTCs) are set and the HSM Power and Ground circuits are clean and tight.
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.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Go To 5
CHECK THE LEFT REAR SEAT CUSHION HEATER ELEMENT RESISTANCE
1. Turn the ignition off.
2. Disconnect the Left Rear Seat Cushion Heater harness connector.
  NOTE:
  Check connectors - Clean/repair as necessary.
3. Measure the resistance between the (P177) Left Rear Seat Heater Control circuit and the (Z922) Ground circuit at the Left Rear Seat Cushion Heater harness 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 (P177) LEFT REAR SEAT HEATER CONTROL CIRCUIT FOR HIGH RESISTANCE IN BODY HARNESS
1. Disconnect the Heated Seat Module (HSM) C3 harness connector.
  NOTE:
  Check connectors. Clean and repair as necessary.
2. Measure the resistance of the (P177) Left Rear Seat Heater Control circuit between the HSM C3 harness connector and the Left Rear Seat Cushion Heater harness connector (harness side).
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the (P177) Left Rear Seat Heater Control circuit for high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK (Z922) GROUND CIRCUIT FOR HIGH RESISTANCE
1. Measure the resistance of the (Z922) Ground circuit between ground and the Left Rear Seat Cushion Heater harness connector (harness side).
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Replace the Heated Seat Module (HSM) in accordance with the Service Information. Refer to MODULE, HEATED SEAT, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repair the (Z922) Ground circuit for 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.
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.