Short to B

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

2. Pull off plug I (18-pole) on the amplifier.

3. Check lead from plug II pin 14 to plug I pin 17 for short to B+.

Fault, fault code Possible causes, elimination, notes

Signal disturbance

Check lead from plug II pin 14 to plug I pin 17

Test point 5

Speedometer A, navigation unit Open circuit/short to ground/short to B+ Fault code 24

Open circuit/short to ground/short to B+

1. Pull off plug on the navigation unit.

2. Pull off plug I on the instrument cluster.

3. Check lead from navigation unit plug pin 3 to plug I pin 13 for continuity and short to ground or short to B+.

Note

The lead is routed via jumper plug 1 on relay carrier 1

Test point 6

Signal, reverse gear-navigation unit Signal implausible Fault code 25

L Check reversing light switch or, on Tiptronic vehicles, position switch.

2. Check lead from navigation unit plug pin 4 to the reversing light switch or position switch for short circuit to B+.

Note

The lead is routed via plug connection X 2/4 and via the jumper plug

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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