Test Point 2

Fault, Fault Code 21 Test Point 2

Data lead, navigation unit-PCM Open circuit/short to ground Short to B+ Signal disturbance

Possible causes, elimination, notes

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 for continuity and short to ground.

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 7 to plug II pin 17 for short to B+.

Signal disturbance
Check lead from navigation unit plug pin 7 to plug II pin 17 for short with other leads.