Fault overview

Test point DTC

Fault effect

Page

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 control

Substitute value: 150 W/m2

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

Outside temperature: 10 °C

Engine temperature: 80 °C

Speed: 70 km/h

Engine speed: 1000 rpm

Fault, DTC

Possible causes, elimination, notes

Test point 1

Interface to the instrument cluster

Diagnosis conditions

No control module fault stored.

No fault on the supply voltage (terminal 15).

Open circuit Short to ground DTC 20

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.

Mote

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 III on the instrument cluster.

3. Connect ohmmeter to connector B 13 and ground,

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

Fault, DTC

Possible causes, elimination, notes

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