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Pinpoint Test Bn: A Single Climate Controlled Seat Is Inoperative

NOTE: When taking measurements at Dual Climate Controlled Seat Module (DCSM) harness connectors, do not insert the electrical probes into the female connector pins. Inserting the probes into connector pins can cause intermittent or open electrical connections after reassembly resulting in Diagnostic Trouble Codes (DTCs) and system failure. Touching the tip of these connector pins is recommended instead.
  1. BN1 CHECK OPERATION OF BOTH CLIMATE CONTROLLED SEATS AND VERIFY THE SYMPTOM 
    • Check the operation of both climate controlled seats and verify the symptom.

    Is only a single climate controlled seat inoperative? 

    • Yes  : GO to BN2  .
    • No  : If both seats are inoperative, GO to SYMPTOM CHART .
  2. BN2 CHECK FOR DCSM DTCs 
    • Enter the following diagnostic mode on the scan tool: Self Test - DCSM  .

    Were any DTCs retrieved during the self-tests? 

  3. BN3 CHECK OPERATION OF THE DCSM USING PIDs 
    NOTE: The purpose of this step is to verify the DCSM  is able to receive and process inbound command messages from the network and demonstrate if the DCSM  is operational. This indicates the FCIM  may not be sending the commands correctly.
    • Enter the following diagnostic mode on the scan tool: DataLogger - DCSM  .

      Driver Seat 

      • Seat cushion thermal electric device temperature (CSHTEMP)
      • Seat back thermal electric device temperature (BK_TEMP)
      • Climate-controlled seat heat command (TED_HEAT_D)

      Front Passenger Seat 

      • Passenger Cushion Thermal Electric Device (TED  ) Temperature (PCSHTMP)
      • Passenger Back TED  Temperature (PBKTMP)
      • Passenger TED  Heat Mode (TED_HEAT_P)
    • NOTE: The DCSM  active commands TED_HEAT_D (driver seat) and TED_HEAT_P (passenger seat) are limited to 15 seconds in the ON state.

      Operate the affected climate controlled seat using the active command while monitoring the appropriate PIDs for that seat.

      • When the command is in process the TED  temperature PIDs on the affected seat should momentarily increase. If no temperature increase is noted, remove the cushion blower filter and repeat the active command while physically monitoring the cushion blower for fan movement.

    Do the PID states or cushion blower movement indicate climate controlled seat operation when using the active command? 

  4. BN4 USE THE TOUCHSCREEN BUTTONS AND MONITOR THE DCSM PID FOR A RESPONSE 
    • Enter the following diagnostic mode on the scan tool: DataLogger - DCSM  .
      • Driver State Seat Mode (DCCSMOD) (driver seat)
      • Passenger State Seat Mode (PCCSMOD) (passenger seat)
    • Start the engine.
    • NOTE: Operation of the climate controlled seats repeatedly on and off or repeatedly switching between heat and cool modes may cause DCSM  DTCs to set, disabling one or both seat system and may require DTCs to be cleared before seat operation may continue. It is recommended to allow time between modes for seat temperatures to return toward ambient temperatures before continuing.

      Attempt to operate the affected climate controlled seat in all modes using the appropriate buttons on the touchscreen interface while monitoring the DCSM  PID DCCSMOD (driver seat) or PCCSMOD (passenger seat).

    Do all the PID states match the climate controlled seat settings selected on the touchscreen interface? 

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