Info

Fault, Fault code

Possible causes, elimination, notes

9. Check wire from connector D 3 to drive motor pin 5 for short to B+

Test point 10

Motor of outside air / recirculation valve

Signal implausible Fault code 29

Diagnosis conditions

No control module fault stored. No fault with supply voltage (5 volts).

Signal implausible

1. Check outside air / recirculation valve for smooth operation.

2. Unplug connectors A, B, C and D from the heating/air-conditioning

3. Unplug connector from outside air / recirculation valve drive motor.

4. Connect ohmmeter to connector D 13 and drive motor

Connect ohmmeter to connector D 5 and drive motor connector pin 2. Connect ohmmeter to connector B 17 and drive motor connector pin 3. Connect ohmmeter to connector C 8 and drive motor connector pin 4. Connect ohmmeter to connector A 12 and drive motor connector pin 5,

5. Check wire from connector D 13 to drive motor pin 1 for short to B+

6. Check wire from connector D 5 to drive motor pin 2 for short to B+

Fault, Fault code

Possible causes, elimination, notes

7. Check wire from connector B 17 to drive motor pin 3 for short to B+ and short to ground.

8. Check wire from connector C 8 to drive motor pin 4 for short to B+ and short to ground.

9. Check wire from connector A 12 to drive motor pin 5 for short to B+ and short to ground.

Signal implausible

1. Check refrigerant pressure (see Page 87 -13).

2. Check high/low pressure switch.

Battery positive voltage must be present at terminal 1 on the high/low pressure switch (with ignition on) if there is sufficient refrigerant in the system.

3. Check the heating activation relay.

Battery positive voltage must be present at terminal 87 when the ignition is switched on.

4. Check the air-conditioning compressor relay.

Battery positive voltage must be present at terminal 30 (with the ignition on) and the high/low pressure switch actuated. Terminal 31 must be connected to ground. Battery positive voltage must be present at terminal 86 when the engine is started.

Terminal 85 must be connected to ground when the DME switches on the air-conditioning compressor (7-second delay).

5. Unplug connector D from the heating/air-conditioning control.

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Do It Yourself Car Diagnosis

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