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Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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 seat.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  2. CHECK (P187) LEFT FRONT SEAT HEATER CONTROL CIRCUIT IN BODY HARNESS FOR A SHORT TO GROUND 
    Fig 1: Check Left Front Seat Heater Control Circuit In Body Harness For A Short To Ground
    GC0148670Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Left Seat Back Heater harness connector.
    3. Disconnect the Left Seat Cushion Heater harness connector.
      NOTE:

      Check connectors. Clean and repair as necessary.

    4. Turn the ignition on.
    5. Using a scan tool, erase DTCs.
    6. Turn the ignition off.
    7. Start the engine and let it run.
    8. Turn the Heated Seat on and operate in all modes.
    9. Using a scan tool, read DTCs.

      Is the same DTC active?

      Yes 

      • Go To  3.

      No 

      • Go To  5.
  3. CHECK (P187) LEFT FRONT SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO GROUND 
    Fig 2: Check Left Front Seat Heater Control Circuit For A Short To Ground
    GC0148666Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the HSM C2 harness connector.
      NOTE:

      Check connectors. Clean and repair as necessary.

    3. Measure the resistance between ground and the (P187) Left Front Seat Heater Control circuit at the Left Seat Cushion Heater harness connector.

      Is the resistance below 10K Ohms?

      Yes 

      • Repair the (P187) Left Front Seat Heater Control circuit for a short to ground.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  4.
  4. CHECK (P187) LEFT FRONT SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO THE (Z909) GROUND CIRCUIT OR TO (P968) HEATED SEAT SENSOR RETURN CIRCUIT 
    Fig 3: Check Left Front Seat Heater Control Circuit For A Short To The Ground Circuit Or To Heated Seat Sensor Return Circuit
    GC0148664Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (P187) Left Front Seat Heater Control circuit and the (Z909) Ground circuit at the Left Seat Cushion Heater connector (harness side).
    2. Measure the resistance between the (P187) Left Front Seat Heater Control circuit and the (P968) Heated Seat Sensor Return circuit at the Left Seat Cushion Heater connector (harness side).

      Is the resistance below 10K Ohms for either measurement?

      Yes 

      • Repair all circuits with a resistance below 10K Ohms for a short to the (P187) Left Front Seat Heater Control circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Replace the Heated Seat Module (HSM) in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  5. CHECK (P187) LEFT FRONT SEAT HEATER CONTROL CIRCUIT IN PIGTAIL HARNESS AND LEFT SEAT BACK HEATER ELEMENT FOR A SHORT TO GROUND 
    Fig 4: Check Left Front Seat Heater Control Circuit In Pigtail Harness And Left Seat Back Heater Element For A Short To Ground
    GC0148663Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Reconnect the Left Seat Back Heater harness connector.
    3. Turn the ignition on.
    4. Using a scan tool, erase DTCs.
    5. Turn the ignition off.
    6. Start the engine and let it run.
    7. Turn the Heated Seat on and operate in all modes.
    8. Using a scan tool, read DTCs.

      Is the same DTC active?

      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.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Replace the Seat Cushion Heater Element in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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