Normal Operation

The driver 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 CHS03 (GN/BN) and return ground to both blowers on circuit RHS03 (GY/OG). The backrest and cushion blowers are independently controlled by separate speed control circuits from the DCSM.

• DTC B272E (Driver 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 driver 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