Test E: DTC B1242 - Air Flow Recirculation Door Driver Circuit Failure
PINPOINT TEST E: DTC B1242 - AIR FLOW RECIRCULATION DOOR DRIVER CIRCUIT FAILURENormal 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 HVAC module. The HVAC 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 HVAC module through circuit 438 (RD/WH) and a 5-volt reference voltage on circuit 436 (RD/LG). The HVAC 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.
- DTC B1242 Air Flow Recirculation Door Driver Circuit Failure - The module senses no change in actuator feedback voltage when the actuator motor has been energized.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Air inlet door actuator motor
- HVAC module
- Stuck or bound linkage or door
E1:
E2-E3:
E4-E7:
E7-E9:
E9-E11:
E12-E14:
E14-E17:
E17-E19:
