Jeep Grand Cherokee WK. Manual — part 425
B1633-LEFT HI BEAM CONTROL CIRCUIT LOW
8L - 10
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
WK
B1633-LEFT HI BEAM CONTROL CIRCUIT LOW (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
•
With the Headlamps activated.
•
Set Condition:
•
When the FCM detects a LOW condition.
Possible Causes
(L33) LEFT HIGHBEAM OUTPUT CIRCUIT
FRONT CONTROL MODULE
Diagnostic Test
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the Scan Tool, clear all FCM DTC’s.
Turn the Highbeam Headlamps on.
With the Scan Tool read the DTC information.
Does the Scan Tool read: B1633-LEFT HI BEAM CONTROL CIRCUIT LOW?
Yes
>> Go To 2
No
>> 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 the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES - STANDARD PROCEDURE)
2.
(L33) LEFT HIGHBEAM OUTPUT CIRCUIT
Turn the ignition off.
Disconnect the FCM C2 harness connector.
Disconnect the Left Headlamp harness connector.
Measure the resistance between ground and the Left Highbeam Out-
put circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (L33) Left Highbeam Output circuit for a short
to ground condition.
Perform the BODY VERIFICATION TEST - VER 1. (Refer
to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES
- STANDARD PROCEDURE)
No
>> Replace the Front Control Module (FCM) in accordance
with the service information.
Perform the BODY VERIFICATION TEST - VER 1. (Refer
to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES
- STANDARD PROCEDURE)
WK
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 11
B1634-LEFT HI BEAM CONTROL CIRCUIT HIGH
8L - 12
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
WK
B1634-LEFT HI BEAM CONTROL CIRCUIT HIGH (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
•
With the Headlamps activated.
•
Set Condition:
•
When the FCM detects a HIGH condition.
Possible Causes
(L33) HIGH BEAM CONTROL CIRCUIT
LEFT HIGH BEAM BULB
FRONT CONTROL MODULE
Diagnostic Test
1.
INTERMITTENT CONDITION
Turn the ignition on.
With the Scan Tool, clear all FCM DTC’s.
Turn the Headlamps on.
With the Scan Tool read the DTC information.
Does the Scan Tool read: B1634-LEFT HI BEAM CONTROL CIRCUIT HIGH?
Yes
>> Go To 2
No
>> 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 the BODY VERIFICATION TEST - VER 1.
2.
LEFT HIGH BEAM BULB
Turn the ignition off.
Inspect the Left High Beam Bulb Assembly.
Is the inoperative bulb OK?
Yes
>> Go To 3
No
>> Replace the Inoperative bulb in accordance with the service information.
Perform the BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL MODULES - STANDARD PROCEDURE)
WK
LAMPS/LIGHTING - EXTERIOR - ELECTRICAL DIAGNOSTICS
8L - 13
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