Jeep Liberty KJ. Manual — part 305
4.
WIPER HIGH/LOW RELAY
Turn the ignition off.
Install a known good relay in place of the Wiper High/Low Relay.
Turn the Wipers On.
Do the Wipers operate normally?
Yes
>> Replace the Wiper High/Low Relay.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 5
5.
BODY CONTROL MODULE
Turn the ignition off
Remove the Wiper High/Low Relay.
Measure the voltage of the Fused B+ circuit of the Wiper High/Low
Relay.
Is the voltage above 10 volts?
Yes
>> Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Repair the Front Wiper Park Switch Sense circuit for an
open condition.
Perform BODY VERIFICATION TEST - VER 1.
8R - 12
WIPERS/WASHERS ELECTRICAL DIAGNOSTICS
KJ
WIPER HIGH/LOW RELAY OUTPUT CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
KJ
WIPERS/WASHERS ELECTRICAL DIAGNOSTICS
8R - 13
•
When Monitored:
With ignition on.
•
Set Condition:
BCM detects a low (ground) signal on the wiper on/off relay output even though it is not attempting to drive the
output for more than 5 seconds.
Possible Causes
WIPER HIGH/LOW RELAY SHORT TO GROUND
WIPER HIGH/LOW RELAY
BODY CONTROL MODULE
Diagnostic Test
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, clear all BCM DTC’s.
Turn the Wipers on.
With the scan tool, read the DTC information.
Does the scan tool read: WIPER HIGH/LOW RELAY OUTPUT 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.
WIPER HIGH/LOW RELAY SHORT TO GROUND
Turn the ignition off.
Disconnect the Wiper High/Low Relay.
Measure the resistance between ground and the Wiper High/Low Relay Control circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the Wiper High/Low Relay Control circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 3
3.
WIPER HIGH/LOW RELAY
Turn the ignition off.
Disconnect the Wiper High/Low Relay harness connector.
Measure the voltage of the Wiper High/Low Relay harness connector coil side feed circuit to ground.
Is the voltage above 10.0 volts?
Yes
>> Replace the Wiper High/Low Relay.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
8R - 14
WIPERS/WASHERS ELECTRICAL DIAGNOSTICS
KJ
WIPER MODE SWITCH CIRCUIT HIGH
For a complete wiring diagram Refer to Section 8W
•
When Monitored:
With the ignition on.
•
Set Condition:
BCM detects a voltage greater than 4.75 volts on the Wiper Mode Switch Input for more than 5 seconds.
Possible Causes
MULTIFUNCTION SWITCH
FRONT WIPER SWITCH MUX 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 Wipers on.
With the scan tool, read DTCs.
Does the scan tool display: WIPER MODE SWITCH 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.
MULTIFUNCTION SWITCH
Turn the ignition off.
Disconnect the Multifunction Switch harness connector.
Connect a jumper wire between the Front Wiper Switch MUX circuit to ground.
Turn the ignition on.
With the DRBIII
T
, select Body, Body Controller and read: Wiper Switch volts.
Does the scan tool display: Multifunction Switch voltage below 0.5volts?
Yes
>> Replace the Multifunction Switch.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Go To 3
3.
FRONT WIPER 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 Front Wiper Switch MUX circuit from the Body Control Module connector to the Multi-
function Switch harness connector.
Is the resistance above 5.0 ohms?
Yes
>> Repair the Front Wiper Switch MUX circuit for an open condition.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
KJ
WIPERS/WASHERS ELECTRICAL DIAGNOSTICS
8R - 15
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