Diagnostic Test

WARNING: This page is about a different car, the 2014 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.

TEST FOR INTERMITTENT CONDITION
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. Start the engine and let it run.
5. Turn the Heated Seat on and operate in all modes.
6. Using a scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - The conditions that caused this code to set are not present at this time. Verify seat harness is routed correctly to the HSM. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals. Attempt to reproduce condition by adjusting the seat.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK (P188) RIGHT FRONT SEAT HEATER CONTROL CIRCUIT FOR HIGH RESISTANCE

Fig 1: Checking Right Front Seat Heater Control Circuit For High Resistance
Courtesy of CHRYSLER GROUP, LLC
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.
  NOTE:
  Check connectors. Clean and repair as necessary.
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 5.0 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 STANDARD PROCEDURE .
CHECK (Z922) GROUND CIRCUIT FOR HIGH RESISTANCE
1. Measure the resistance of the (Z922) Ground circuit between ground and the Right Seat Cushion Heater harness connector.
2. Measure the resistance of the (Z922) Ground circuit between ground and the Passenger Seat Assembly harness connector.
  Is the resistance below 5.0 Ohms for both measurements?
  
  Yes
  - Go To 4
  No
  - Repair the (Z922) Ground circuit for high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK RIGHT SEAT CUSHION HEATER ELEMENT RESISTANCE

Fig 2: Checking Right Seat Cushion Heater Element For Resistance
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (P188) Right Front Seat Heater Control circuit and the (Z922) 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 STANDARD PROCEDURE .
  No
  - Go To 5
CHECK PIGTAIL HARNESS AND RIGHT SEAT BACK HEATER ELEMENT RESISTANCE
1. Measure the resistance between the (P188) Right Front Seat Heater Control circuit and the (Z922) 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, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  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 STANDARD PROCEDURE .