Info

Fault, fault code

Possible causes, elimination, notes

Test point 1

Data lead, air conditioner

Open circuit/short to

Signal disturbance Fault code 20

Open circuit/short to ground

1. Pull off plug II on the display and operator control unit.

2. Pull off plug C on the heater / A/C control unit.

3. Check lead from plug II pin 15 to plug C 12 for continuity

Note

The lead is routed via the 10-pole plug connection

Short to B+

1. Pull off plug II on the display and operator control unit.

2. Pull off plug C on the heater/ A/C control unit.

3. Check lead from plug II pin 15 to plug C 12 for short to B+.

Signal disturbance

Check wiring harness for short with other leads.

Fault, fault code

Possible causes, elimination, notes

Test point 2

Data lead, navigation

Open circuil/short to

Signal disturbance Fault code 21

Open circuit/short to ground

1. Pull off plug II on the display and operator control unit.

2. Pull off plug on the navigation unit.

3. Check lead from navigation unit plug pin 7 to plug II pin 17

Short to B+

Pull off plug II on the display and operator control unit.

2. Pull off plug on the navigation unit.

3. Check lead from navigation unit plug pin 7 to plug II pin 17

Signal disturbance

Check lead from navigation unit plug pin 7 to plug II pin 17

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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