B0429

Schematic:

CIRCUIT DESCRIPTION
The rear air mix actuator is an electronic actuator stepper motor. Whenever the IPM battery power is interrupted (or by using the scan tool) the IPM will recheck motor travel range.

CONDITIONS FOR RUNNING THE DTC
^ The IPM power must be interrupted.
^ Perform the Recalibrate all Motors command using the scan tool.

CONDITIONS FOR SETTING THE DTC
The rear air mix actuator actual total travel range (max - min) is less than or greater than the calibrated limits.

ACTION TAKEN WHEN THE DTC SETS
^ The IPM will continue to make use of whatever actuator travel range is still available.
^ Each time the ignition switch is turned ON the IPM will recheck the actuator travel range.

CONDITIONS FOR CLEARING THE MIL/DTC
The actuator travel range error must be corrected.

DIAGNOSTIC AIDS
^ The range fault code can only be set following a check of the actuator travel range. The actuator travel range check can only be initiated by disrupting power to the IPM (disconnecting the battery) or with the scan tool.
^ The calibration limit is 157-181 counts (3.1-3.6 V). An actual range below this limit suggests an obstruction (something stuck in the door limiting travel). An actual range above this limit suggests an over travel condition (disconnected linkage).

TEST DESCRIPTION

Steps 1-8:

Steps 9-16:

The numbers below refer to the step numbers on the diagnostic table.
3. To determine the actual range of door travel, subtract the MIN Rear Temp Dr Pos from the MAX Rear Temp Dr Pos values displayed during the recalibration procedure in Step 2.