Display: 5 锟斤拷 0.5 Volt
If more than 5.5 Volt is displayed, replace the heating/air cond. control.
Voltage too low
1. Pull off connector C on the heating/air conditioning control.
2. Pull off all connectors on the valve drive motors.
3. Connect ohmmeter to connector C 8 and ground.
Display: Infinity Ohms
If 0 - 5 Ohms is displayed, check the wiring for pinching and chafing.
4. Check potentiometer in the drive motors.
Temperature mixing valve:
Connect ohmmeter to pins 1 and 3.
Display: 4 - 5 kOhms at 23 锟斤拷C
Footwell / defrost valve:
Connect ohmmeter to pins 1 and 3.
Display: 4 - 5 kOhms at 23 锟斤拷C
Central valve:
Connect ohmmeter to pins 1 and 3.
Display: 4 - 5 kOhms at 23 锟斤拷C
Outside air / recirculation valve:
Connect ohmmeter to pins 4 and 5.
Display: 4 - 5 kOhms at 23 锟斤拷C
Test Point 7
Test point 7
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 pin 1.
Display: < 5 Ohms
Connect ohmmeter to connector B 8 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 10 and drive motor connector pin 4.
Display: < 5 Ohms
Connect ohmmeter to connector D 2 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 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.