Pinpoint Test S: All Climate Controlled Seats Are Inoperative
Seats
Pinpoint Tests
Pinpoint Test S: 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 11 (30A) to C3305a pin E, circuit SBB11 (BU/RD) and fuse 12 (30A) to C3305a pin F, circuit SBB12 (GN/RD). The DCSM is supplied ground from C3305a pin M, circuit GD139 (BK/YE). Both voltage supply circuits are hot at all times but the climate controlled seat system only operates with the engine running. The system can be operated with the Key ON Engine OFF (KOEO) only by using a scan tool to bypass the climate controlled seat switches on the HVAC module and when commanding a heat or cool mode operation in this manner 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 and the other seat will remain operational.
The DCSM receives all control commands over the Controller Area Network (CAN) communication circuits from the HVAC module which contains the climate controlled seat switches. The climate controlled seat system can only operate if both the HVAC and DCSM are communicating correctly on the CAN circuits.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Medium Speed Controller Area Network (MS-CAN) fault
- HVAC module
- DCSM
PINPOINT TEST S: ALL CLIMATE CONTROLLED SEATS ARE INOPERATIVE
NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition switch is ON.
NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
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S1 CHECK FOR DCSM AND HVAC MODULE DTCs
- Enter the following diagnostic mode on the scan tool: Self Test - DCSM.
- Enter the following diagnostic mode on the scan tool: Self Test - HVAC Module.
- Are any DTCs retrieved?
Yes
For DCSM DTCs, GO to the Dual Climate Controlled Seat Module (DCSM) DTC Chart.
For HVAC module DTCs, REFER to Heating and Air Conditioning to diagnose the HVAC module fault.
No
If either the DCSM or HVAC is not communicating, REFER to Information Bus to diagnose the no communication concern.
If module communication is OK, CHECK the climate control system operation and REFER to Heating and Air Conditioning to diagnose any concerns found.
Otherwise, INSTALL a new DCSM and CARRY OUT Programmable Module Installation. REFER to Dual Climate Controlled Seat Module (DCSM) Dual Climate Controlled Seat Module (DCSM). REPEAT the self-test. CLEAR the DTCs.
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