Jeep Liberty KJ. Manual — part 126
*COURTESY LAMPS INOPERATIVE-OVERHEAD LAMPS
For a complete wiring diagram Refer to Section 8W
Possible Causes
JUNCTION BLOCK
OPEN BULB
COURTESY LAMP DRIVER CIRCUIT OPEN
Diagnostic Test
1.
INTERMITTENT CONDITION
Turn the ignition on.
Turn the Courtesy Lamps on.
Verify that the Courtesy Lamps are inoperative.
Do the Courtesy Lamps operate normally?
Yes
>> The condition that caused the symptom is currently not present. Inspect the related wiring for a possible
intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 2
2.
OPEN BULB
Remove and inspect any inoperative courtesy lamp bulbs.
Are any of the inspected bulbs open or shorted?
Yes
>> Replace the applicable open bulb.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 3
3.
COURTESY LAMP DRIVER CIRCUIT OPEN
Turn the ignition on.
Measure the voltage of the Courtesy Lamp Driver circuit to ground.
Is the voltage above 10.0 volts?
Yes
>> Repair the Courtesy Lamps Driver circuit for an open condition.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Junction Block.
Perform BODY VERIFICATION TEST - VER 1.
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LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
KJ
*COURTESY LAMPS STAY ON AT ALL TIMES
For a complete wiring diagram Refer to Section 8W
Possible Causes
COURTESY LAMPS DRIVER HEADLINER CIRCUIT SHORT TO GROUND
COURTESY LAMPS DRIVER CIRCUIT BODY HARNESS SHORT TO GROUND
PANEL LAMPS DIMMER SWITCH MUX SHORT TO GROUND
MULTIFUNCTION SWITCH
BODY CONTROL MODULE
Diagnostic Test
1.
COURTESY LAMPS DRIVER (HEADLINER) CIRCUIT SHORTED TO GROUND
Ensure the Dimmer Switch is off.
Close all the passenger doors.
Disconnect the Junction Block C24 connector from the front of the junction block.
Observe the Courtesy Lamps.
Did the Courtesy Lamps turn off?
Yes
>> Repair the Courtesy Lamps Driver circuit in the headliner harness for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 2
2.
COURTESY LAMPS DRIVER CIRCUIT (BODY HARNESS) SHORTED TO GROUND
Ensure the Dimmer Switch is off.
Close all the passenger doors.
Disconnect the Junction Block C24 harness connector from the Junction Block.
Observe the Courtesy Lamps.
Did Courtesy Lamps turn off?
Yes
>> Repair the Courtesy Lamps Driver circuit in the Body Harness for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 3
3.
PANEL LAMPS DIMMER SWITCH MUX SHORT TO GROUND
Disconnect the Body Control Module C2 connector.
Disconnect the Multifunction Switch harness connector.
Measure the resistance of the Panel Lamps Dimmer Switch MUX circuit to ground.
Is the resistance below 5.0 ohms?
Yes
>> Repair the Panel Lamps Dimmer Switch MUX circuit for a short to ground condition.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 4
KJ
LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
8L - 163
4.
MULTIFUNCTION SWITCH
Turn the ignition off.
Disconnect the Body Control Module C2 connector.
Disconnect the Multifunction Switch harness connector.
Turn the ignition on.
Measure the resistance of the Multifunction Switch Ground circuit.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Multifunction Switch.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
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LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
KJ
DIMMING LEVEL SWITCH INPUT CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
Ignition on.
•
Set Condition:
BCM detects a voltage greater than 4.75 volts on the dimming level switch input for more than 5 seconds.
Possible Causes
PANEL LAMPS DIMMER SWITCH MUX OPEN
SHORT TO BATTERY
MULTIFUNCTION SWITCH
BODY CONTROL MODULE
Diagnostic Test
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, clear all BCM DTC’s.
Actuate the Dimming Level Switch.
With the scan tool, read the DTC information.
Does the scan tool read: Dimming Level 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.
PANEL LAMPS DIMMER SWITCH MUX OPEN
Turn the ignition off.
Disconnect the BCM C2 harness connector.
Turn the ignition on to check the Courtesy Lamp operation.
Did the Courtesy Lamps come on?
Yes
>> Go To 3
No
>> Repair the Panel Lamps Dimmer Switch MUX circuit for an open condition.
Perform BODY VERIFICATION TEST - VER 1.
3.
SHORT TO BATTERY
Ensure the Junction Block C24 harness connector on the front of the junction block is connected.
Turn on all overhead, map and rear rearing lamps by their own individual switches.
This will disconnect each lamp from the Courtesy Lamp Driver Circuit.
Did any lamp fail to light when it was turned on by it’s own switch?
Yes
>> Repair the short to battery condition.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 4
KJ
LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
8L - 165
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