Jeep Liberty KJ. Manual — part 91
PARK LAMP RELAY CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With ignition on.
•
Set Condition:
BCM detects a low (ground) on the Park Lamp Relay even though it is not attempting to turn on the Park
Lamps for more than 5 seconds.
Possible Causes
PARK LAMP RELAY SHORT TO GROUND
PARK LAMP RELAY
BODY CONTROL MODULE
Diagnostic Test
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, clear all BCM DTC’s.
Turn the Park Lamps on.
With the scan tool, read the DTC information.
Does the scan tool read: PARK LAMP RELAY CKT LOW?
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.
PARK LAMP RELAY SHORT TO GROUND
Turn the ignition off.
Disconnect the Park Lamp Relay.
Measure the resistance between ground and the Park Lamp Relay Control circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the Park lamp Relay Control circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 3
3.
PARK LAMP RELAY
Turn the ignition off.
Disconnect the Park Lamp Relay harness connector.
Measure the voltage of the Park Lamp Relay harness connector coil side feed circuit to ground.
Is the voltage above 10.0 volts?
Yes
>> Replace the Park Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
8L - 22
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
KJ
REAR FOG RELAY CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on.
•
Set Condition:
BCM detects battery on the Rear Fog Relay when it is attempting to turn on the Front Fog Lamps for more
than 5 seconds. The BCM is programmed per Country Code whether or not a vehicle is equipped with a Rear
Fog Relay.
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: REAR FOG RELAY CIRCUIT 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 Rear Fog Lamp Relay is present.
Is the Rear 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 2.
Is the fuse open?
Yes
>> Replace the open fuse.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 4
KJ
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 23
4.
FOG LAMP RELAY
Turn the ignition off.
Install a known good relay in place of the Rear Fog Lamp Relay.
Turn the Fog Lamps On.
Do the Rear 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 condition.
Perform BODY VERIFICATION TEST - VER 1.
8L - 24
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
KJ
REAR FOG RELAY CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on.
•
Set Condition:
BCM detects a low (ground) on the Fog Relay even though it is not attempting to turn on the Rear Fog Lamps
for more than 5 seconds.
Possible Causes
LOW BEAM RELAY
OPEN FUSED B+ CIRCUIT
LOW BEAM RELAY CONTROL CIRCUIT
LOW BEAM RELAY
BODY CONTROL MODULE
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: Rear Fog Relay Circuit Low?
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.
REAR FOG RELAY SHORT TO GROUND
Turn the ignition off.
Disconnect the Rear Fog Relay.
Measure the resistance between ground and the Rear Fog Relay Control circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the Rear Fog Relay Control circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 3
3.
REAR FOG RELAY
Turn the ignition off.
Disconnect the Rear Fog Relay harness connector from the Junction Block.
Measure the voltage of the Rear Fog Relay harness connector coil side feed circuit to ground.
Is the voltage above 10.0 volts?
Yes
>> Replace the Rear Fog Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
KJ
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 25
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