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Pinpoint Test

  1. CHECK OPERATION OF BOTH CLIMATE CONTROLLED SEATS AND VERIFY THE SYMPTOM
    1. Check the operation of both climate controlled seats and verify the symptom.

    Is only a single climate controlled seat inoperative? 

    1. Yes: GO to 2  .
    2. No: If both seats are inoperative, REFER to Symptom Chart(s) .
  2. CHECK FOR DCSM DTCs 
    1. Using a scan tool, perform DCSM self-test.

    Were any DTCs retrieved during the self-test? 

    1. Yes: REFER to DTC Chart: Dual Climate Controlled Seat Module (DCSM) .
    2. No: GO to 3  .
  3. 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.
    1. Using a scan tool, view DCSM driver seat PIDs  :
      • Seat cushion thermal electric device temperature (CSHTEMP)
      • Seat back thermal electric device temperature (BK_TEMP)
      • Climate-controlled seat heat command (TED_HEAT_D)
    2. Using a scan tool, view DCSM front passenger seat PIDs  :
      • Passenger cushion TED temperature (PCSHTMP)
      • Passenger back TED temperature (PBKTMP)
      • Passenger TED heat mode (TED_HEAT_P)
    3. 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? 

    1. Yes: GO to 4  .
    2. No: INSTALL a new DCSM. REFER to Dual Climate Controlled Seat Module (DCSM) .
  4. USE THE TOUCHSCREEN BUTTONS AND MONITOR THE DCSM PIDs  FOR A RESPONSE
    1. Using a scan tool, view DCSM PIDs  .
      • Driver state seat mode (DCCSMOD)
      • Passenger state seat mode (PCCSMOD)
    2. Start the engine.
    3. NOTE: Operation of the climate controlled seats repeatedly on and off or repeatedly switching between heat and cool modes can cause DCSM DTCs  to set, disabling one or both seat system and can require DTCs  to be cleared before seat operation can 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 PIDs states match the climate controlled seat settings selected on the touchscreen interface? 

    1. Yes: If the fault is intermittent, CHECK for causes of the intermittent fault. INSPECT the connectors, terminals and wiring. ATTEMPT to recreate the fault by flexing the wire harness and operating the system. CHECK the electrical connectors for corrosion, poor pin contact or pushed-out pins. REPAIR any intermittent concerns found and TIGHTEN any loose DCSM connector pins.
    2. No: REFER to SYMPTOM CHART: GENERAL AUDIO SYSTEM to diagnose the inoperative touchscreen button(s).
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