Test E: DTC B1242 - Recirculation Door Failure

PINPOINT TEST E: DTC B1242 - RECIRCULATION DOOR FAILURE

E1:

E2-E3:

E4-E7:

E7-E9:

E9-E12:

E12-E14:

E14-E17:

E17-E19:

E20-E22:

Normal Operation
Under normal operation, the air inlet door actuator motor is supplied voltage or ground on circuit 1069 (OG/LB), depending on desired actuator rotation, by the EATC module. The EATC module then supplies the appropriate voltage or ground to the other side of the actuator motor on circuit 660 (YE/LG).

The air inlet door actuator feedback resistor is supplied a ground from the EATC module through circuit 438 (RD/WH) and a 5-volt reference voltage on circuit 436 (RD/LG). The EATC module reads the voltage on the air inlet door actuator feedback circuit 435 (YE/LB) to determine the air inlet door actuator position by the position of the actuator feedback resistor wiper arm.

Possible Causes
- An open, short to voltage, ground or together in circuits 660 (YE/LG), 1069 (OG/LB), 438 (RD/WH), 436 (RD/LG) and 435 (YE/LB)
- Air inlet door actuator motor
- Electronic automatic temperature control (EATC) module
- Stuck or bound linkage or door