Pinpoint Test N: All Climate Controlled Seats Are Inoperative
Seats
Special Tools:
Pinpoint Tests
Pinpoint Test N: All Climate Controlled Seats Are Inoperative
Refer to Wiring Diagrams Set 119, Climate Controlled Seats for schematic and connector information.
Normal Operation
The Dual Climate Controlled Seat Module (DCSM) is supplied voltage from Battery Junction Box (BJB) fuse 69 (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. The system can be operated with the ignition ON 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 module 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 N: 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 is ON.
NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
