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.
3. Pull off connector on the central valve drive motor.
4. Connect ohmmeter to connector A 12 and drive motor connector pin 1.
Display: < 5 Ohms
Connect ohmmeter to connector B 9 and drive motor connector pin 2.
Display: < 5 Ohms
Connect ohmmeter to connector C 8 and drive motor connector pin 3.
Display: < 5 Ohms
Connect ohmmeter to connector D 4 and drive motor connector pin 4.
Display: < 5 Ohms
Connect ohmmeter to connector D 12 and drive motor connector pin 5.
Display: < 5 Ohms
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 and short to ground.
7. Check wire from connector C 8 to drive motor pin 3 for short to plus and short to ground.
8. Check wire from connector D 4 to drive motor pin 4 for short to plus and short to ground.
9. Check wire from connector D 12 to drive motor pin 5 for short to B+ and short to ground.
Test Point 9
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 pin 1.
Display: < 5 Ohms
Connect ohmmeter to connector B 10 and drive motor connector pin 2.
Display: < 5 Ohms
Connect ohmmeter to connector A 12 and drive motor connector pin 3.
Display: < 5 Ohms
Connect ohmmeter to connector D 11 and drive motor connector pin 4.
Display: < 5 Ohms
Connect ohmmeter to connector D 3 and drive motor connector pin 5.
Display: < 5 Ohms
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 10 to drive motor pin 2 for short to B+ 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 11 to drive motor pin 4 for short to B+ and short to ground.
9. Check wire from connector D 3 to drive motor pin 5 for short to plus and short to ground.
Test Point 10
Test point 10
Motor, outside air / recirculation valve