Pinpoint Test AH: DTC B272B

Seats

Special Tools:

Pinpoint Tests

Pinpoint Test AH: DTC B272B

Refer to Wiring Diagrams Set 119, Climate Controlled Seats for schematic and connector information.

Normal Operation

The Dual Climate Controlled Seat Module (DCSM) monitors the Thermo-Electric Device (TED) temperature sensor on circuit VHS36 (YE/BU). The DCSM supplies voltage to TED blower circuit CHS03 (BN/GN), blower ground on circuit RHS03 (GY/OG) and supplies a variable voltage to circuit VHS16 (BU/GN) to control the blower speed. Cabin air enters the blower through a filter attached to the TED housing. Conditioned air exits the TED and flows through a manifold attached to the foam pad.

- DTC B272B (Passenger Back Over-Temp Detected) - If the passenger seat backrest TED temperature exceeds 85°C (185°F) in cool mode or 70°C (158°F) in heat mode for more than 34 seconds the DCSM will shut down the passenger seat system and set this DTC.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Restricted backrest TED filter
- Crushed or restricted climate controlled seat manifold
- Backrest TED assembly
- DCSM



PINPOINT TEST AH: DTC B272B

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.

AH1-AH5:

AH5-AH7:

AH7-AH9:

AH9 (Continued):