Info

Fault, fault code

Possible causes, elimination, notes

Test point 3

PCM-navigation unit Short to ground Short to B+ Fault code 22

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 5 to plug II pin 4

Short to B+

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 5 to plug II pin 4

Test point 4

Data lead, DSP-PCM Open circuit/short to

Signal disturbance Fault code 23

Open circuit/short to ground

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 continuity

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