Pinpoint Test AL: DTC B272F

Seats

Special Tools:

Pinpoint Tests

Pinpoint Test AL: DTC B272F

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

Normal Operation

The passenger climate controlled seat blowers are located within the backrest and cushion Thermo-Electric Devices (TEDs). The Dual Climate Controlled Seat Module (DCSM) supplies voltage to both blowers on circuit CHS08 (BN/YE) and ground to both blowers on circuit RHS08 (VT/WH). The blowers are independently controlled by separate speed control circuits from the DCSM.

- DTC B272F (Passenger Ignition Run/Blower Circuit Short to Ground) (this DTC sets for an open or short to voltage) - If either the blower voltage supply or return circuits are open (to both cushion and backrest blowers) or shorted to voltage, the DTC is set and after 4-6 seconds the DCSM disables outputs to the passenger seat. The DTC will also set if the blower voltage supply or return circuit is open to only one blower when DCSM supply voltage is less than 12 volts.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- HVAC module
- Backrest or cushion TED
- DCSM



PINPOINT TEST AL: DTC B272F

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.

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.

AL1-AL2:

AL2-AL3: