Fault overview

Test point Fault code Fault effect

10 11 12

20 21 22

Substitute values

Substitute value: 10 °C

Substitute value: 22 °C

Substitute value: 50 °C

Valve cannot be adjusted Valve cannot be adjusted Valve cannot be adjusted Valve cannot be adjusted

No regulation

Substitute value: 150 W/rrf

Page

80- D 16 80-D 17 80- D 18 80-D 19 80 - D 20 80 - D 21 80 - D 22 80 - D 23 80 - D 25 80 - D 26 80 - D 27 80 - D 28 80 - D 30 80 - D 30

Fault, Fault code

Possible causes, elimination, notes

Test point 1

Interface to instrument cluster

Diagnosis conditions

No control module fault stored. No fault with supply voltage (terminal 15).

Open circuit Short to ground Fault code 20

Open circuit

1. Unplug connector B from the heating/air-conditioning control.

2. Unplug connector III from the instrument cluster.

3. Connect ohmmeter to connector B 13 and to connector III pin 26 Display < 5 Q

Note

The wire is routed via the 12-pole plug connection on the heating/air-conditioning unit.

Short to ground

1. Unplug connector B from the heating/air-conditioning control.

2. Unplug connector III from the instrument cluster.

3. Connect ohmmeter to connector B 13 and ground. Display: °° Q

If 0 - 5 £2 is displayed, check wiring harness for pinching

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