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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:

    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. 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.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  2. CHECK REAR SEAT CUSHION HEATER ELEMENT RESISTANCE 
    Fig 1: Checking For Open Right Rear Seat Cushion Heater Element
    GC0148789Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Right Rear Seat Cushion Heater harness connector.
      NOTE:

      Check connectors. Clean and repair as necessary.

    3. Measure the resistance between the (P178) Right Rear Seat Heater Control circuit and the (Z909) Ground circuit at the Right Rear Seat Cushion Heater Connector (seat side).

      Is the resistance above 4.8 Ohms?

      Yes 

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

      No 

      • Go To  3.
  3. CHECK (P178) RIGHT REAR SEAT HEATER CONTROL CIRCUIT FOR HIGH RESISTANCE IN BODY HARNESS 
    Fig 2: Checking Right Rear Seat Heater Control Circuit For An Open In Body Harness
    GC0148787Courtesy of CHRYSLER GROUP, LLC
    1. Disconnect the HSM C3 harness connector.
      NOTE:

      Check connectors. Clean and repair as necessary.

    2. Measure the resistance of the (P178) Right Rear Seat Heater Control circuit between the HSM C3 harness connector and the Right Rear Seat Cushion Heater harness connector (harness side).

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  4.

      No 

      • Repair the (P178) Right Rear Seat Heater Control circuit for high resistance.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  4. CHECK (Z909) GROUND CIRCUIT FOR HIGH RESISTANCE 
    Fig 3: Checking Ground Circuit For An Open
    GC0148785Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (Z909) Ground circuit between ground and the Right 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.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Repair the (Z909) Ground circuit for high resistance.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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