Pinpoint Test K: All Climate Controlled Seats Are Inoperative
Seats
Pinpoint Tests
Pinpoint Test K: All Climate Controlled Seats Are Inoperative
Refer to Wiring Diagram Set 119, Climate Controlled Seats for schematic and connector information. Diagrams By Number
Normal Operation
The Dual Climate Controlled Seat Module (DCSM) is supplied voltage from Battery Junction Box (BJB) fuse 22 (30A) to C3265a pins E and F, circuit CBX01 (GN/RD). The DCSM is supplied ground from C3265a pin M, circuit GD903 (BK/WH). Both voltage supply circuits are hot at all times but the climate controlled seat system only operates with the engine running. There are 2 Controller Area Network (CAN) circuits that transmit and receive messages. When commanding a heat or cool mode operation with the scan tool, the system will only operate in 15-second intervals. Both voltage supply circuits are spliced together internal to the DCSM, so if one circuit becomes open, both seats can still be operated. However, if a fault occurs setting a DTC specific to either climate controlled seat, only the affected seat will be disabled by the DCSM.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- MS-CAN fault
- FCIM
- HVAC module
- DCSM
PINPOINT TEST K: ALL CLIMATE CONTROLLED SEATS ARE INOPERATIVE
NOTICE: 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.
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K1 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. Symptom Related Diagnostic Procedures
If both blowers operate, GO to K5.
No
GO to K2.
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K2 VERIFY CLIMATE CONTROLLED SEAT INDICATOR ILLUMINATION
- Verify system indicator illumination.
- Does any climate controlled seat indicator illuminate or flash and then turn off?
Yes
GO to K5.
No
For vehicles with navigation, GO to K3.
For vehicles without navigation, GO to K4.
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K3 CHECK THE FCIM FOR DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - FCIM.
- Are any DTCs retrieved?
Yes
REFER to the Master DTC Chart in Body Control Systems. Diagnostic Trouble Code (DTC) Chart
No
GO to K4.
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K4 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 Body Control Systems. Diagnostic Trouble Code (DTC) Chart
No
Vehicles with navigation, GO to K6.
Vehicles without navigation, GO to K7.
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K5 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. 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. Component Tests and General Diagnostics
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K6 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
INSTALL a new HVAC module. TEST the system for normal operation.
No
INSTALL a new FCIM. REFER to Accessories and Optional Equipment. TEST the system for normal operation.
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K7 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
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 HVAC module. TEST the system for normal operation.
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