Jeep Liberty KJ. Manual — part 87
FRONT FOG RELAY CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
8L - 6
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
With the ignition on.
•
Set Condition:
BCM detects a low (ground) on the Front Fog Relay even though it is not attempting to turn on the Front Fog
Lamps for more than 5 seconds.
Possible Causes
FRONT FOG RELAY SHORT TO GROUND
FRONT FOG 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: FRONT FOG 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.
FRONT FOG RELAY SHORT TO GROUND
Turn the ignition off.
Disconnect the Front Fog Relay.
Measure the resistance between ground and the Front Fog Relay Con-
trol circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the Front Fog Relay Control circuit for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 3
KJ
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 7
3.
FRONT FOG RELAY
Turn the ignition off.
Disconnect the Front Fog Relay harness connector.
Measure the voltage of the Front Fog Relay harness connector coil side
feed circuit to ground.
Is the voltage above 10.0 volts?
Yes
>> Replace the Fog Lamp Relay.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
8L - 8
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
KJ
HEADLAMP SWITCH INPUT CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
Ignition on.
•
Set Condition:
The BCM detects a voltage greater than 4.75 V on the Headlamp Switch Input for more than 5 seconds.
Possible Causes
HEADLAMP SWITCH OPEN
HEADLAMP SWITCH MUX CIRCUIT OPEN
HEADLAMP SWITCH RETURN CIRCUIT OPEN
BODY CONTROL MODULE
Diagnostic Test
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the Scan Tool, erase all BCM DTC’s.
Turn the headlamps to the ON position.
With the Scan Tool, read DTCs.
Does the Scan Tool display: HEADLAMP SWITCH INPUT 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.
HEADLAMP SWITCH OPEN
Turn the ignition off.
Disconnect the Multifunction Switch harness connector.
Connect a jumper wire between the Headlamp Switch MUX circuit and
the Headlamp Switch Return circuit in the Multifunction Switch harness
connector.
Turn the ignition on.
With the Scan Tool, select Body, Body Controller and read: Headlamp
Switch volts.
Does the Scan Tool display Headlamp Switch voltage below 0.5
volts?
Yes
>> Replace the Headlamp Switch.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 3
KJ
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 9
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст