Pinpoint Test U: All Climate Controlled Seats Are Inoperative - Switch Indicators May Or May Not Illuminate

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.

U1 VERIFY CLIMATE CONTROLLED SEAT BLOWER OPERATION
- Ignition OFF.
- Remove the driver and front passenger cushion Thermo-Electric Device (TED) filters to verify blower operation.
  - Turn the filters to the left (counterclockwise) and remove.
- Start the engine.
- Operate climate controlled seat buttons while verifying both blowers operate.
- Does either blower operate?
  - Yes: If only one blower operates, GO to Symptom Chart to diagnose a single climate controlled seat is inoperative.
    If both blowers operate, GO to U5.
  - No: GO to U2.
U2 VERIFY CLIMATE CONTROLLED SEAT INDICATOR ILLUMINATION
- Ignition OFF.
- Start the engine.
- Verify system indicator illumination.
- Does any climate controlled seat indicator illuminate or flash and then turn off?
  - Yes: GO to U5.
  - No: GO to U3.
U3 CHECK THE FCIM FOR DTCs
- Ignition In ACC.
- Enter the following diagnostic mode on the scan tool: Self Test - FCIM.
- Are any DTCs retrieved?
  - Yes: REFER to the Master DTC Chart in INFORMATION AND ENTERTAINMENT SYSTEMS .
  - No: GO to U4.
U4 CHECK THE HVAC MODULE FOR DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - HVAC module.
- Are any DTCs retrieved?
  - Yes: REFER to the Master DTC Chart in CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS or CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS - HYBRID .
  - No: GO to U6.
U5 CHECK THE DCSM FOR DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - DCSM.
- Are any DTCs present?
  - Yes: GO to the Dual Climate Controlled Seat Module (DCSM) DTC Chart .
  - No: 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.
    REPEAT the self-test.
    
    If no intermittent concerns are found, CARRY OUT the Component Test - Thermo-Electric Device (TED) Cooling Performance for both seats.
U6 MONITOR THE FCIM PIDs AND CHECK INPUTS
- Enter the following diagnostic mode on the scan tool: DataLogger - FCIM- PIDs.
  - Driver Cooled Seat (CC_SW_D_CL_S)
  - Driver Heated Seat (CC_SW_D_HSEATS)
  - Passenger Cooled Seat (CC_SW_P_CL_S)
  - Passenger Heated Seat (CC_SW_P_HSEATS)
- Monitor the FCIM PIDs while individually pushing driver and passenger climate controlled seat switch buttons.
- Do the PID values agree with the switch positions?
  - Yes: GO to U7.
  - No: INSTALL a new FCIM. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS . TEST the system for normal operation.
U7 MONITOR THE HVAC MODULE PIDs AND CHECK INPUTS
- Enter the following diagnostic mode on the scan tool: DataLogger - HVAC module - PIDs.
  - Driver Cooled Seat (CC_SW_D_CL_S)
  - Driver Heated Seat (CC_SW_D_HSEATS)
  - Passenger Cooled Seat (CC_SW_P_CL_S)
  - Passenger Heated Seat (CC_SW_P_HSEATS)
- Monitor the HVAC module PIDs while individually pushing driver and passenger climate controlled seat switch buttons.
- Do the PID values agree with the switch positions?
  - Yes: GO to U8.
  - No: INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
U8 CHECK DCSM USING ACTIVE COMMANDS
- Enter the following diagnostic mode on the scan tool: DataLogger - DCSM- PIDs.
  - Seat Cushion Thermal Electric Device Temperature (CSHTEMP)
  - Seat Back Thermal Electric Device Temperature (BK_TEMP)
  - Climate-controlled Seat Heat Command (TED_HEAT_D)
  - Passenger Cushion Thermal Electric Device (TED) Temperature (PCSHTMP)
  - Passenger Back TED Temperature (PBKTMP)
  - Passenger TED Heat Mode (TED_HEAT_P)
- Operate the climate controlled seats using active commands while monitoring the appropriate PIDs.
  - When the command is in process, the TED temperature PIDs on the seat being commanded 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?
  - Yes: 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 HVAC module connector pins. REPEAT the self-test. CHECK the system for normal operation.
  - No: INSTALL a new DCSM. REFER to Dual Climate Controlled Seat Module (DCSM) . REPEAT the self-test. CLEAR the DTCs.