Test Point 9

TEST POINT 9
motor, Footwell / Defrost Valve Signal Implausible

DTC 28

Fault Effect: Valve cannot be adjusted

Diagnosis Conditions
- No control module fault stored.
- No fault on the supply voltage (5 Volts).

Signal Implausible

1. Check footwell / defrost valve for smooth operation.

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

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

4. Check drive motor circuits for continuity.

- 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.