Codes 5/33621 and 5/33671

Air recirculation flap motor - testing

Fault symptom

Permanent: 53621
Intermittent: 33621

Conditions
Air recirculation flap motor, short circuit +12 V. (version 2.01)

Fault symptom

Permanent: 53671
Intermittent: 33671

Conditions
Short circuit to ground (Version 2.01).

Testing

ISAT scan tool command: 279

Display shows:
Desired position of the air recirculation flap motor: "Fresh air" or "Recirculation".

Important : The desired position of the air recirculation flap motor does not mean that the motor moves the flap to different positions, but only that it has been requested by the Automatic Climate Control (ACC) control module. Visually check that the desired position corresponds to the actual position.







Action
1 Visually check that the flap moves between the "Recirculation" and "Fresh air" positions when the flap is manually controlled.
2 Unplug the ACC control module's 39 pin connector and check the resistance in the motor winding between connector pins 5 and 24. Resistance should be about 50 Ohm.
3 If resistance is incorrect, unplug the motor connector and measure the resistance directly on the motor winding. If faulty, try a new stepping motor.
4 If resistance across the motor winding is correct, check for open circuit between the ACC control module connector and the motor connector. Also check for short circuit between the wiring harness and ground.
5 If all readings give normal values, connect the ACC control module's 39 pin connector and measure the voltage on the 2 pin connector 59. Connect the red multimeter cable to pin 1 and the black cable to pin 2. Measurement should be carried out when the flap is moved to "Recirculation" (+10/12 V) and the LED lights or to "Fresh air" (-10/12 V) and the LED is off. If measurements give correct readings, try with a new motor.
6 It not, try with a new ACC control module.