Jeep Grand Cherokee WK. Manual — part 324
U0241-LOST COMMUNICATION WITH AUTO HIGHBEAM HEADLAMP CONTROL MODULE (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
•
With the ignition on
•
Battery voltage between 10 and 16 volts
•
IOD fuse installed
•
FCM is configured correctly
•
Set Condition:
Bus messages not received from the inside rearview mirror (smartbeam) for approximately 2 to 5 seconds.
Possible Causes
CAN B BUS CIRCUITS OPEN OR SHORTED
DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
FCM NOT CONFIGURED CORRECTLY
INSIDE REARVIEW MIRROR (SMARTBEAM) POWER AND GROUND
INSIDE REARVIEW MIRROR (SMARTBEAM)
MODULE THAT SET THIS DTC
Diagnostic Test
1.
VERIFY DTC IS ACTIVE
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
With the scan tool, read active DTCs.
Is this DTC active?
Yes
>> Go To 2
No
>> Refer to the Stored Lost Communication test procedure. Refer to the table of contents in this section.
2.
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
With the scan tool, read active DTCs from all modules.
NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or igni-
tion related DTCs.
Does the scan tool display any active DTCs to the conditions listed above?
Yes
>> Diagnose and repair the DTC. Refer to the Index for a complete list of the symptoms.
No
>> Go To 3
3.
VERIFY THAT THE AHBM (SMARTBEAM) IS ACTIVE ON THE BUS
Turn the ignition on.
With the scan tool, select Network Diagnostics.
Verify that the AHBM (SMARTBEAM) is active on the bus.
Is the AHBM (SMARTBEAM) active on the bus?
Yes
>> Go To 4
No
>> Refer to the No Response test procedure. Refer to the table of contents in this section.
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
WK
U0241-LOST COMMUNICATION WITH AUTO HIGHBEAM HEADLAMP CONTROL MODULE (CONTINUED)
4.
CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
With the scan tool, select Network Diagnostics.
Is there more than one module with active DTCs “Logged Against” the AHBM (SMARTBEAM)?
Yes
>> Replace/update the Inside Rearview Mirror (SMARTBEAM) in accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
No
>> Replace/update the module that set this DTC in accordance with the service information.
Perform the appropriate VERIFICATION TEST.
WK
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 143
U1108-ADDITIONAL CAN B ECU DETECTED
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ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
WK
U1108-ADDITIONAL CAN B ECU DETECTED (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Continuously.
•
Set Condition:
The Front Control Module detects an additional CAN B module and requires a reconfiguration.
Possible Causes
ADDITIONAL MODULE ADDED/REMOVED FROM THE CAN B BUS NETWORK
Diagnostic Test
1.
RECONFIGURE THE FRONT CONTROL MODULE
Turn the ignition on.
With the scan tool, select network view and press the gateway button. This will list the CAN modules on the vehicle.
Read and record the listed modules.
With the scan tool, select FCM, miscellaneous functions then add/remove ECUs.
With the scan tool, add or remove the module that was not configured in the FCM.
With the scan tool, erase DTC’s.
Cycle the ignition from on to off 3 times and read the active FCM DTC’s.
Does the scan tool display this DTC as active?
Yes
>> Retest system and attempt to reconfigure the FCM.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
No
>> Repair is complete.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
WK
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 145
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