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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 >> B1EB3-1B-Rear Left Seat Heater Sensor - Circuit Resistance Above Threshold >> 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:

    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 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 operating all HSM functions one at a time. Attempt to reproduce condition by adjusting the front seat.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  2. CHECK (P672) LEFT REAR HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO VOLTAGE 
    Fig 1: Checking Left Rear Heated Seat Temp Sense Circuit For A Short To Voltage
    GC0090250Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the HSM C3 harness connector.
      NOTE:

      Check connectors. Clean and repair as necessary.

    3. Start the engine and let it run.
    4. Measure the voltage of the (P672) Left Rear Heated Seat Temp Sense circuit between the HSM C3 harness connector and ground.

      Is there any voltage present?

      Yes 

      • Go To  3.

      No 

      • Go To  4.
  3. CHECK (P672) LEFT REAR HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO THE (F931) FUSED IGNITION RUN CONTROL OUTPUT CIRCUIT 
    Fig 2: Checking Left Rear Heated Seat Temp Sense Circuit For A Short To The Fused Ignition Run Control Output Circuit
    GC0090251Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Measure the resistance between the (P672) Left Rear Heated Seat Temp Sense circuit and the (F931) Fused Ignition Run Control Output circuit at HSM C3 harness connector.

      Is the resistance below 10K Ohms?

      Yes 

      • Repair the (P672) Left Rear Heated Seat Temp Sense circuit for a short to the (F931) Fused Ignition Run Control Output circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Repair the (P672) Left Rear Heated Seat Temp Sense circuit for a short to voltage.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  4. CHECK (P672) LEFT REAR HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO VOLTAGE DURING SEAT ADJUSTMENT 
    Fig 3: Checking Left Rear Heated Seat Temp Sense Circuit For A Short To Voltage
    GC0090250Courtesy of CHRYSLER GROUP, LLC
    1. Measure the voltage of the (P672) Left Rear Heated Seat Temp Sense 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 (P672) Left Rear Heated Seat Temp Sense circuit for a short to voltage.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  5.
  5. CHECK (P672) LEFT REAR HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO THE (P177) LEFT REAR SEAT HEATER CONTROL CIRCUIT OR TO (P178) RIGHT REAR SEAT HEATER CONTROL CIRCUIT 
    Fig 4: Checking Left Rear Heated Seat Temp Sense Circuit For A Short To The Left Rear Seat Heater Control Circuit Or To Right Rear Seat Heater Control Circuit
    GC0090252Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Left Rear Seat Cushion Heater harness connector.
    3. Disconnect the Right Rear Seat Cushion Heater harness connector.
      NOTE:

      Check connectors. Clean and repair as necessary.

    4. Measure the resistance between the (P672) Left Rear Heated Seat Temp Sense circuit and the (P177) Left Rear Seat Heater Control circuit at the HSM C3 harness connector.
    5. Measure the resistance between the (P672) Left Rear Heated Seat Temp Sense circuit and the (P178) Right Rear Seat Heater Control circuit at the HSM C3 harness connector.

      Is the resistance below 10K Ohms for either measurement?

      Yes 

      • Repair all circuits with a resistance below 10K Ohms for a short to the (P672) Left Rear Heated Seat Temp Sense circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  6.
  6. CHECK (P672) LEFT REAR HEATED SEAT TEMP SENSE CIRCUIT VOLTAGE TO LEFT REAR SEAT CUSHION HEATER 
    Fig 5: Checking Left Rear Heated Seat Temp Sense Circuit Voltage To Left Rear Seat Cushion Heater
    GC0148778Courtesy of CHRYSLER GROUP, LLC
    1. Reconnect the HSM C3 harness connector.
    2. Start the engine and let it run.
    3. Measure the voltage between the (P672) Left Rear Heated Seat Temp Sense circuit and the (P968) Heated Seat Sensor Return circuit at the Left Rear Seat Cushion Heater connector (harness side).

      Is the voltage above 4.5-volts?

      Yes 

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

      No 

      • Go To  7.
  7. CHECK (P672) LEFT REAR HEATED SEAT TEMP SENSE CIRCUIT OR AN OPEN 
    Fig 6: Checking Left Rear Heated Seat Temp Sense Circuit For An Open
    GC0148779Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the HSM C3 harness connector.
    3. Measure the resistance of the (P672) Left Rear Heated Seat Temp Sense circuit between the HSM C3 harness connector and the Left Rear Seat Cushion Heater harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  8.

      No 

      • Repair the (P672) Left Rear Heated Seat Temp Sense circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  8. CHECK (P968) HEATED SEAT SENSOR RETURN CIRCUIT FOR AN OPEN 
    Fig 7: Checking Heated Seat Sensor Return Circuit For An Open
    GC0148784Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (P968) Heated Seat Sensor Return circuit between the HSM C3 connector and the Left Rear Seat Cushion Heater 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 (P968) Heated Seat Sensor Return circuit for an open.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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