Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. 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. Start the engine and let it run.
5. Using a scan tool, read HSM DTCs.
  Does the scan tool show this DTC as active?
  
  Yes
  - Go To 2
  No
  - Go To 6
CHECK THE (P177) LEFT REAR SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Heated Seat Module (HSM) C3 harness connector.
  NOTE:
  Check connectors - Clean/repair as necessary.
3. Ignition on, engine running.
4. Measure the voltage of the (P177) Left Rear Seat Heater Control circuit between the HSM C3 harness connector and ground.
  Is there any voltage present?
  
  Yes
  - Go To 3
  No
  - Go To 4
CHECK THE (P177) LEFT REAR SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO THE (F922) FUSED IGNITION RUN CONTROL OUTPUT CIRCUIT
1. Turn the ignition off.
2. Measure the resistance between the (P177) Left Rear Seat Heater Control circuit and the (F922) Fused Ignition Run Control Output circuit at HSM C3 harness connector.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the (P177) Left Rear Seat Heater Control circuit for a short to the (F922) Fused Ignition Run Control Output circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the (P177) Left Rear Seat Heater Control circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (P177) LEFT REAR SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO VOLTAGE DURING SEAT ADJUSTMENT
1. Measure the voltage of the (P177) Left Rear Seat Heater Control circuit between the HSM C3 harness connector and ground while adjusting the front seat.
  Is there any voltage present during the seat adjustment?
  
  Yes
  - Repair the (P177) Left Rear Seat Heater Control circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 5
CHECK THE (P177) LEFT REAR SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO THE (P178) RIGHT REAR SEAT HEATER CONTROL CIRCUIT
1. Turn the ignition off.
2. Disconnect the Left or Right Rear Seat Cushion Heater harness connector.
3. Measure the resistance between the (P177) Left Rear Seat Heater Control circuit and the (P178) Right Rear Seat Heater Control circuit at HSM C3 harness connector.
  Is the resistance below 10K Ohms?
  
  Yes
  - Repair the (P177) Left Rear Seat Heater Control circuit for a short to the (P178) Right Rear Seat Heater Control circuit.
  - 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 .
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 STANDARD PROCEDURE .
  No
  - Test complete.