Jeep Liberty KJ. Manual — part 86
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
DIAGNOSIS AND TESTING
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LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
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FRONT FOG RELAY CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W
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LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 3
•
When Monitored:
With the ignition on.
•
Set Condition:
BCM detects battery on the Front Fog Relay when it is attempting to turn on the Front Fog Lamps for more
than 5 seconds. The BCM learns that the Front Fog Options exists on a vehicle when it detects a ground on
the Front Fog Switch Input circuit.
Possible Causes
MISSING RELAY
OPEN FUSE
FOG LAMP RELAY
BODY CONTROL MODULE
FOG LAMP RELAY CONTROL CIRCUIT OPEN
Diagnostic Test
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the Scan Tool, clear all BCM DTC’s.
Turn the Fog Lamps on.
With the Scan Tool, read the DTC information.
Does the Scan Tool read: FRONT FOG RELAY CKT HIGH?
Yes
>> Go To 2
No
>> The condition is not present at this time. Monitor scan tool parameters while wiggling the related wire
harness. Refer to any Technical Service Bulletins that may apply. Visually inspect the related wiring har-
ness and connector terminals.
Perform BODY VERIFICATION TEST - VER 1.
2.
MISSING RELAY
Turn the ignition off.
Check the Junction Block to make certain the Fog Lamp Relay is present.
Is the Fog Lamp Relay present?
Yes
>> Go To 3
No
>> Replace the missing Fog Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1.
3.
OPEN FUSE
Turn the ignition off.
Check Junction Block fuse 19.
Is the fuse open?
Yes
>> Replace the open fuse.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 4
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LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
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4.
FOG LAMP RELAY
Turn the ignition off.
Install a known good relay in place of the fog lamp relay.
Turn the Fog Lamps On.
Do the Fog Lamps operate normally?
Yes
>> Replace the Fog Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 5
5.
BODY CONTROL MODULE
Turn the ignition off.
Remove the Fog Lamp Relay.
Measure the voltage of the Fused B+ circuit of the fog lamp relay.
Is the voltage above 10 volts?
Yes
>> Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Repair the Fog Lamp Relay Control Circuit for an open con-
dition.
Perform BODY VERIFICATION TEST - VER 1.
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LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 5
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