Test point

Motor, temperature mixing valve

Signal implausible DTC 26

Diagnosis conditions

No control module fault stored. No fault on the supply voltage (5 Volt).

Signal implausible

1. Check temperature mixing valve for smooth operation.

2. Pull off connectors A, B, C and D on the heating/air cond. control

3. Pull off connector on the temperature mixing valve drive motor.

4. Connect ohmmeter to connector C 8 and drive motor connector

Connect ohmmeter to connector B 8 and drive motor connector

Fault, DTC

Connect ohmmeter to connector A 12 and drive motor connector Connect ohmmeter to connector D 10 and drive motor connector Connect ohmmeter to connector D 2 and drive motor connector

5. Check wire from connector C 8 to drive motor pin 1 for short to plus and short to ground.

6. Check wire from connector B 8 to drive motor pin 2 for short to plus and short to ground.

7. Check wire from connector A 12 to drive motor pin 3 for short to B+,

8. Check wire from connector D 10 to drive motor pin 4 for short to B+ and short to ground.

9. Check wire from connector D 2 to drive motor pin 5 for short to plus and short to ground.

Possible causes, elimination, notes

Test point 8

Motor, central valve

Signal implausible DTC 27

Diagnosis conditions

No control module fault stored. No fault on the supply voltage (5 Volt).

Signal implausible

1. Check central valve for smooth operation.

2. Pull off connectors A, B, C and D on the heating/air cond. control.

Fault, DTC

Possible causes, elimination, notes

3. Pull off connector on the central valve drive motor.

4. Connect ohmmeter to connector A 12 and drive motor connector

Connect ohmmeter to connector B 9 and drive motor connector Connect ohmmeter to connector C 8 and drive motor connector Connect ohmmeter to connector D 4 and drive motor connector Connect ohmmeter to connector D 12 and drive motor connector

5. Check wire from connector A 12 to drive motor pin 1 for short to B+.

6. Check wire from connector B 9 to drive motor pin 2 for short to plus

7. Check wire from connector C 8 to drive motor pin 3 for short to plus

8. Check wire from connector D 4 to drive motor pin 4 for short to plus

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

Fault, DTC

Possible causes, elimination, notes

Test point 9

Motor, footwell/ defrost valve

Signal implausible DTC 28

Diagnosis conditions

No control module fault stored. No fault on the supply voltage (5 Volt).

Signal implausible

1. Check footwell / defrost valve for smooth operation.

2. Pull off connectors A, B, C and D on the heating/air cond. control.

3. Pull off connector on the footwell / defrost valve drive motor.

4. Connect ohmmeter to connector C 8 and drive motor connector

Connect ohmmeter to connector B 10 and drive motor connector Connect ohmmeter to connector A 12 and drive motor connector Connect ohmmeter to connector D 11 and drive motor connector Connect ohmmeter to connector D 3 and drive motor connector

5. Check wire from connector C 8 to drive motor pin 1 for short to plus

6. Check wire from connector B 10 to drive motor pin 2 for short to B+

7. Check wire from connector A 12 to drive motor pin 3 for short to B+.

8. Check wire from connector D 11 to drive motor pin 4 for short to B+

Fault, DTC

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