A/C Control Module and Recirculation Door Motor, Checking Function

A/C Control Module and Recirculation Door Motor, Checking Function

Special tools, testers and auxiliary items required

• Test Box 105 Pin (V.A.G 1598/42-1) and Test Adapter (V.A.G 1598/47)

• Voltage Tester (V.A.G 1527 B)

- Remove the glove compartment.

- Remove A/C Control Module (J301). Refer to => [ Heater and A/C System Controls ] Heater and A/C System Controls.

- Connect the A/C control module to vehicle wiring harness via (V.A.G 1598/47).

- Connect (V.A.G 1598/42-1) to (V.A.G 1598/47).

- Switch ignition on.

- Turn rotary switch for air distribution - B - into "air distribution to instrument panel vents" position.






- Fresh/recirculating air button - F - is not operated (fresh air mode, button indicator lamp does not light up).

- Recirculation Door Motor (V113) and thus the fresh/recirculating air door stands in "fresh air mode" position (recirculating air intake opening - C - is closed).






- Connect a (V.A.G 1527 B) to the (V.A.G 1598/47) between terminals 9 and 10 (connector - C -).






- Operate fresh/recirculating air button (button indicator lamp lights up).

- Ground is applied at terminal 9 for a short time and Positive is applied at terminal 10 for a short time.

- Recirculation door motor and thus the recirculation door moves into "recirculating air mode" position (recirculating air intake opening - C - is opened).






• Positive is applied only for a certain time period after operating the fresh/recirculating air button, when this time has elapsed the control motor is only still actuated over a certain duty cycle (lamp in (V.A.G 1527 B) only continues to blink on briefly).

• The illustration above shows the arrangement for testing on a vehicle without A/C system, disregard connector - A - (in magnified area) and (V.A.G 1527 B) - B - on vehicles with A/C system.

- Operate fresh/recirculating air button - F - (recirculating air, button indicator lamp goes out).






• By pressing fresh/recirculating air button - F -, A/C Control Module (J301) changes the voltage supply to Recirculation Door Motor (V113) (B+ and GND are interchanged).

- Check voltage at connector - C - between terminals 9 and 10 e.g. using (V.A.G 1527 B) - B - (to Fresh/Recirculating Air Door Motor (V154) ).






- Ground is applied at terminal 10 for a short time and Positive is applied at terminal 9 for a short time.

- Recirculation door motor and thus the recirculation door moves into "fresh air mode" position (recirculating air intake opening - C - is closed).






If no malfunction is detected during this test:

- Check fresh/recirculating air door for freedom of movement.

- Replace the Recirculation door motor (V113). Refer to=> [ Fresh/Recirculation Air Door Motor (V154)/(V113) ] Fresh/Recirculation Air Door Motor (V154)/(V113)

The function is not OK

- Check wire connection between A/C Control Module (J301) and Recirculation door motor (V113) for open circuit or short circuit.

- Check voltage supply and Ground (GND) connection to A/C Control Module.

- Replace A/C control module. Refer to=> [ Heater Controls ] Heater Controls.