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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 153 (Heated Seat Module (HSM) - Electrical Diagnostics) >> DTC Troubleshooting >> B10C4-1E-Heated Steering Wheel Control - Circuit Resistance Out Of Range >> Diagnostic Test

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. With the 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 HSW on.
    6. With the 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 rotating the steering wheel. Attempt to reproduce condition by adjusting the seat.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  2. STEERING WHEEL HEATER RESISTANCE 
    Fig 1: Checking Resistance On Heated Steering Wheel Feed Circuit
    GC0090169Courtesy of CHRYSLER GROUP, LLC
    WARNING:

    Turn the ignition off, disconnect the 12-volt battery and wait two minutes before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

    1. Remove the Driver Airbag in accordance with the Service Information.
    2. Disconnect the Steering Wheel Heater harness connector.
      NOTE:

      Before proceeding, thoroughly inspect the wiring harness and connectors between the HSW and the Clockspring. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.

    3. Measure the resistance between the (C91) Heated Steering Wheel Feed circuit and the (C986) Heated Steering Wheel Return circuit at the Steering Wheel Heater (component side) connector.

      Is the resistance 1.85 ± 0.2 Ohms?

      Yes 

      • Go To  3.

      No 

      • Replace the Heated Steering Wheel in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  3. CHECK (C91) HEATED STEERING WHEEL FEED CIRCUIT FOR HIGH RESISTANCE 
    Fig 2: Checking Heated Steering Wheel Feed Circuit For High Resistance
    GC0090170Courtesy of CHRYSLER GROUP, LLC
    1. Disconnect the HSM C4 harness connector.
      NOTE:

      Check connectors. Clean and repair as necessary.

    2. Measure the resistance of the (C91) Heated Steering Wheel Feed circuit between the Heated Steering Wheel connector and the HSM C4 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  4.

      No 

      • Go To  5.
  4. CHECK (C986) HEATED STEERING WHEEL RETURN CIRCUIT FOR A HIGH RESISTANCE 
    Fig 3: Checking Heated Steering Wheel Return Circuit For A High Resistance
    GC0090171Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (C986) Heated Steering Wheel Return circuit between the Steering Wheel Heater connector and the HSM C4 harness connector.

      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 

      • Go To  6.
  5. CHECK (C91) HEATED STEERING WHEEL FEED CIRCUIT FOR HIGH RESISTANCE BETWEEN CLOCKSPRING AND HSM 
    Fig 4: Check Heated Steering Wheel Feed Circuit For An Open Between Clockspring And HSM
    GC0148683Courtesy of CHRYSLER GROUP, LLC
    1. Disconnect the Clockspring C5 harness connector.
      NOTE:

      Check connectors. Clean and repair as necessary.

    2. Measure the resistance of the (C91) Heated Steering Wheel Feed circuit between the Clockspring C5 harness connector and the HSM C4 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Replace the Clockspring in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Repair the high resistance in the (C91) Heated Steering Wheel Feed circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  6. CHECK (C986) HEATED STEERING WHEEL RETURN CIRCUIT FOR HIGH RESISTANCE BETWEEN CLOCKSPRING AND HSM 
    Fig 5: Check The Heated Steering Wheel Return Circuit For An Open Between Clockspring And HSM
    GC0148682Courtesy of CHRYSLER GROUP, LLC
    1. Disconnect the Clockspring C5 harness connector.
      NOTE:

      Check connectors. Clean and repair as necessary.

    2. Measure the resistance of the (C986) Heated Steering Wheel Return circuit between the Clockspring C5 harness connector and the HSM C4 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Replace the Clockspring in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Repair the high resistance in the (C986) Heated Steering Wheel Return circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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