Diagnostic Test

WARNING: This page is about a different car, the 2012 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

TEST FOR INTERMITTENT CONDITION
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. 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 front seat.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
CHECK FOR AN OPEN LEFT REAR SEAT CUSHION HEATER ELEMENT
1. Turn the ignition off.
2. Disconnect the Left Rear Seat Cushion Heater harness connector.
  NOTE:
  Check connectors. Clean and 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 .
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
  No
  - Go To 3.
CHECK (P177) LEFT REAR SEAT HEATER CONTROL CIRCUIT FOR AN OPEN IN BODY HARNESS
1. Disconnect the 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 an open.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
CHECK (Z922) GROUND CIRCUIT FOR AN OPEN
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 .
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.
  No
  - Repair the (Z922) Ground circuit for an open.
  - Refer to STANDARD PROCEDURE and perform the BODY VERIFICATION TEST.