Jeep Liberty KJ. Manual — part 88
3.
HEADLAMP SWITCH MUX CIRCUIT OPEN
Turn the ignition off.
Disconnect the Body Control Module harness connector.
Disconnect the Multifunction Switch harness connector.
Measure resistance of the Headlamp Switch MUX circuit from the Body
Control Module connector to the Multifunction Switch harness connec-
tor.
Is the resistance above 5.0 ohms?
Yes
>> Repair the Headlamp Switch MUX circuit for an open con-
dition.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 4
4.
HEADLAMP SWITCH RETURN CIRCUIT OPEN
Turn the ignition off.
Disconnect the Body Control Module harness connector.
Disconnect the Multifunction Switch C1 harness connector.
Measure resistance of the Headlamp Switch Return circuit from the
Body Control Module connector to the Multifunction Switch harness con-
nector.
Is the resistance above 5.0 ohms?
Yes
>> Repair the Headlamp Switch Return circuit for an open con-
dition.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
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LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
KJ
HEADLAMP SWITCH INPUT CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
Ignition on.
•
Set Condition:
BCM detects a voltage less than 0.25 volts on the Headlamp Switch Input for more than 5 seconds.
Possible Causes
HEADLAMP SWITCH SHORTED
HEADLAMP SWITCH MUX CIRCUIT SHORT TO RETURN CIRCUIT
HEADLAMP SWITCH MUX CIRCUIT SHORT TO GROUND
HEADLAMP SWITCH RETURN CIRCUIT SHORT TO GROUND
BODY CONTROL MODULE
Diagnostic Test
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the Scan Tool, clear 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 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.
HEADLAMP SWITCH SHORTED
Turn the ignition off.
Disconnect the Multifunction Switch harness connector.
Turn the ignition on.
With the Scan Tool, select Body, Body Control Module and read: Headlamp Switch voltage.
Does the Scan Tool display Headlamp Switch voltage above 4.8 volts?
Yes
>> Replace the Multifunction Switch.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 3
KJ
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 11
3.
HEADLAMP SWITCH MUX CIRCUIT SHORT TO MUX RETURN CIRCUIT
Turn the ignition off.
Disconnect the Body Control Module harness connector.
Disconnect the Multifunction Switch harness connector.
Measure resistance between the Headlamp Switch Return circuit and
the Headlamp Switch MUX circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the Headlamp Switch MUX circuit for a short to the
Headlamp Switch Return circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 4
4.
HEADLAMP SWITCH MUX CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the Body Control Module harness connector.
Disconnect the Multifunction Switch harness connector.
Measure resistance between ground and the Headlamp Switch MUX
circuit.
Is the resistance above 5.0 ohms?
Yes
>> Repair the Headlamp Switch MUX Circuit for a short to
ground condition.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 5
5.
HEADLAMP SWITCH RETURN CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the Body Control Module harness connector.
Disconnect the Multifunction Switch harness connector.
Measure resistance between ground and the Headlamp Switch Return
circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the Headlamp Switch Return Circuit for a short to
ground condition.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
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LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
KJ
HIGH BEAM RELAY CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With ignition on.
•
Set Condition:
BCM detects battery on the High Beam Relay when it is attempting to turn on the High Beams for more than
5 seconds.
Possible Causes
MISSING RELAY
OPEN FUSE
HIGH BEAM RELAY
MULTIFUNCTION SWITCH
HIGH BEAM SWITCH SENSE CIRCUIT OPEN
Diagnostic Test
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the Scan Tool, clear all BCM DTC’s.
Turn the High Beams on.
With the Scan Tool, read the DTC information.
Does the Scan Tool read: HIGH BEAM 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 High Beam Relay is present.
Is the High Beam Relay present?
Yes
>> Go To 3
No
>> Replace the missing High Beam Relay.
Perform BODY VERIFICATION TEST - VER 1.
3.
OPEN FUSE
Turn the ignition off.
Check the Junction Block High Beam fuses 26 and 27.
Are any of the fuses open?
Yes
>> Replace the open fuse.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 4
KJ
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 13
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