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 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.
5. Turn the Heated Seat on and operate in all modes.
6. With the scan tool, read HSM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Go To 6
CHECK THE (P188) RIGHT FRONT SEAT HEATER CONTROL CIRCUIT FOR HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the HSM C2 harness connector.
3. Disconnect the Right Seat Cushion Heater harness connector.
4. Disconnect the Right Seat Back Heater harness connector.
5. Disconnect the Passenger Seat Assembly harness connector.
6. Measure the resistance of the (P188) Right Front Seat Heater Control circuit between the HSM C2 harness connector and the Right Seat Cushion Heater harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 3
  No
  - Repair the (P188) Right Front Seat Heater Control circuit for high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (Z909) GROUND CIRCUIT FOR HIGH RESISTANCE
1. Measure the resistance of the (Z909) Ground circuit between ground and the Right Seat Cushion Heater harness connector.
2. Measure the resistance of the (Z909) Ground circuit between ground and the Passenger Seat Assembly harness connector.
  Is the resistance below 3.0 Ohms for both measurements?
  
  Yes
  - Go To 4
  No
  - Repair the (Z909) Ground circuit for high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE RIGHT SEAT CUSHION HEATER ELEMENT RESISTANCE
1. Measure the resistance between the (P188) Right Front Seat Heater Control circuit and the (Z909) Ground circuit at the Right Seat Cushion Heater connector (component side).
  Is the resistance above 4.8 Ohms?
  
  Yes
  - Replace the 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 5
CHECK THE PIGTAIL HARNESS AND RIGHT SEAT BACK HEATER ELEMENT RESISTANCE
1. Measure the resistance between the (P188) Right Front Seat Heater Control circuit and the (Z909) Ground circuit at the Right Seat Back Heater harness connector (seat back side).
  Is the resistance above 4.8 Ohms?
  
  Yes
  - Repair or replace the pigtail harness for a short to ground or replace the shorted Seat Back Heater Element in accordance with the Service Information. Refer to COVER, SEAT BACK, FRONT, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - 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 .
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. Check Service Bulletins for any possible causes that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Test complete.