Cab Power Feed Circuit - Jeep WG Grand Cherokee 2002 Service Manual

Symptom:

CAB POWER FEED CIRCUIT

When Monitored and Set Condition:
CAB POWER FEED CIRCUIT
When Monitored: Ignition on. The CAB monitors the Fused B(+) circuit at all times for
proper system voltage.
Set Condition: If the Fused B(+) voltage is missing when the CAB detects that an internal
main driver is not on , the Diagnostic Trouble Code (DTC) is set.
INTERMITTENT DTC
BLOWN FUSE - FUSED B(+) CIRCUIT
NO B+ SUPPLY TO FUSE
FUSED B(+) CIRCUIT OPEN
B(+) CIRCUIT INTERMITTENTLY SHORTED TO GROUND
B(+) CIRCUIT SHORTED TO GROUND
CAB - FUSED B(+) CIRCUIT OPEN
CAB - FUSED B(+) CIRCUIT SHORTED TO GROUND
TEST
1 Turn the ignition on.
With the DRBIII , erase DTC's.
Turn the ignition off.
Turn the ignition on.
Drive the vehicle above 25 km/h (15 mph) for at least 10 seconds.
Stop the vehicle.
With the DRBIII , read DTC's.
Does the DRBIII display CAB Power Feed Circuit DTC present right now?
Yes → Go To 2
→ Go To 10
No
2 Turn the ignition off.
Remove and Inspect the ABS Fuse 19 in the Junction Block.
Is the Fuse blown?
Yes → Go To 3
→ Go To 7
No
POSSIBLE CAUSES
ACTION
25
BRAKES (CAB)
APPLICABILITY
All
All