Test Point 6

Test point 6
Supply voltage (5 Volt)
Voltage too high
Voltage too low

DTC 25

Diagnosis conditions
No control module fault stored.

Voltage too high
1. Pull off connector C on the heating/air conditioning control.
2. Connect voltmeter to C 8 and ground.
Switch on ignition.
Display: 0 Volt
If battery positive voltage is displayed, check wiring harness for pinching and chafing.

3. Push on connector C.
4. Connect voltmeter to C 8 and ground.
Switch on ignition.
Display: 5 ± 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 °C

Footwell / defrost valve:
Connect ohmmeter to pins 1 and 3.
Display: 4 - 5 kOhms at 23 °C

Central valve:
Connect ohmmeter to pins 1 and 3.
Display: 4 - 5 kOhms at 23 °C

Outside air / recirculation valve:
Connect ohmmeter to pins 4 and 5.
Display: 4 - 5 kOhms at 23 °C