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 and ground to both blowers. The blowers are independently controlled by separate speed control circuits from the DCSM  .

• DTC B272F (Passenger Ignition Run/Blower Circuit Short to Ground) - 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 also sets 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
• Backrest or cushion TED 
• DCSM