Test Point 1

TEST POINT 1
Interface To The Instrument Cluster Open Circuit, Short To Ground

DTC 20

Fault Effect: Substitute values *

Diagnosis Conditions
- No control module fault stored.
- No fault on the supply voltage (terminal 15).

Open Circuit

1. Pull off connector B on the heating/air conditioning control.

2. Pull off connector III on the instrument cluster.

3. Connect ohmmeter to connector B 13 and to connector III, pin 26.

Display: < 5 ohms

Note:
The wire is routed via the 12-pole plug connection on the heater/ A/C unit.

Short To Ground

1. Pull off connector B on the heating/air conditioning control.

2. Pull off connector Ill on the instrument cluster.

3. Connect ohmmeter to connector B 13 and ground.

Display: infinity

If 0 - 5 ohms is displayed, check the wiring for pinching and chafing.


* Outside temperature: 10 °C
Engine temperature: 80 °C
Vehicle speed: 70 km/h
Engine speed: 1000 rpm