Pinpoint Test AF : A Single Climate Controlled Seat Is Inoperative: Notes

Refer to Climate Controlled Seats, Climate Controlled Seats for schematic and connector information.

Normal Operation 

The Dual Climate Controlled Seat Module(DCSM) is supplied voltage at all times, but the climate controlled seat system only operates with the engine running. The system can be operated with the ignition ON engine OFF by using a scan tool to bypass the climate controlled seat buttons on the touchscreen interface. When commanding a heat or cool mode operation in this manner, it only operates 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 is disabled by the DCSM.

When the climate control seat buttons are activated on the touchscreen interface, the APIM sends the climate controlled seat commands to the Front Controls Interface Module(FCIM) using the I-CAN. The FCIM sends the request message to the IPC using the I-CAN. The IPC sends the request message to the BCM over the HS-CAN. Finally the BCM sends the communicates climate controlled seat commands to the DCSM using the MS-CAN.

This pinpoint test is intended to diagnose the following: 

• Wiring, terminals or connectors
• Touchscreen
• DCSM