Jeep Grand Cherokee WK. Manual — part 253
U0020-CAN B BUS OFF PERFORMANCE (CONTINUED)
•
When Monitored:
Continuously.
•
Set Condition:
Whenever the Can B Bus (+) or B Bus (–) circuit is open, shorted to voltage or shorted to ground, this
code will set.
Possible Causes
CAN B BUS DTCs IN FRONT CONTROL MODULE
(D54) CAN B BUS (–) CIRCUIT OPEN
(D55) CAN B BUS (+) CIRCUIT OPEN
AMPLIFIER
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase DTCs
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read DTCs.
Does the scan tool display U0020-CAN B BUS OFF PERFOR-
MANCE?
Yes
>> Go To 2
No
>> The conditions that caused this code to set are not
present at this time. Using the wiring diagram/schematic
as a guide, inspect the wiring and connectors.
Perform BODY VERIFICATION TEST - VER 1.
2.
CHECK FRONT CONTROL MODULE DTCs
With the scan tool, read Front Control Module DTCs
Does the scan tool display any CAN B BUS DTCs – ACTIVE?
Yes
>> Refer to the symptom list for problems related to Commu-
nication in the ELECTRICAL.– ELECTRONIC CONTROL
MODULES – ELECTRICAL DIAGNOSES section.
No
>> Go to 3
8A - 148
AUDIO/VIDEO SYSTEMS - ELECTRICAL DIAGNOSIS
WK
U0020-CAN B BUS OFF PERFORMANCE (CONTINUED)
3.
CAN B BUS (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the Amplifier harness connector.
Disconnect the Front Control Module C1 harness connector.
Measure the resistance of the (D55) Can B Bus (+) circuit between the
Front Control Module C1 harness connector and the Amplifier harness
connector.
Is the resistance below 2.0 ohms?
Yes
>> Go To 4
Perform BODY VERIFICATION TEST - VER 1.
No
>> Repair the Can B Bus (+) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
WK
AUDIO/VIDEO SYSTEMS - ELECTRICAL DIAGNOSIS
8A - 149
U0020-CAN B BUS OFF PERFORMANCE (CONTINUED)
4.
CAN B BUS (–) CIRCUIT OPEN
Measure the resistance of the (D54) Can B Bus (–) circuit between the
Front Control Module C1 harness connector and the Amplifier harness
connector.
Is the resistance below 2.0 ohms?
Yes
>> Replace the Amplifier in accordance with the service infor-
mation..
Perform BODY VERIFICATION TEST - VER 1.
No
>> Repair the Can B Bus (–) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
8A - 150
AUDIO/VIDEO SYSTEMS - ELECTRICAL DIAGNOSIS
WK
U0141–LOST COMMUNICATION WITH FRONT CONTROL MODULE
For a complete wiring diagram Refer to Section 8W.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
U0151-LOST COMMUNICATION WITH OCCUPANT RESTRAINT CONTROLLER
(ORC)
For a complete wiring diagram Refer to Section 8W.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
U0154-LOST COMMUNICATION WITH OCCUPANT CLASSIFICATION MODULE
For a complete wiring diagram Refer to Section 8W.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
U0155-LOST COMMUNICATION WITH CLUSTER/CCN
For a complete wiring diagram Refer to Section 8W.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
U0156-LOST COMMUNICATION WITH EOM
For a complete wiring diagram Refer to Section 8W.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
U0164-LOST COMMUNICATION WITH HVAC CONTROL MODULE
For a complete wiring diagram Refer to Section 8W.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
U0168-LOST COMMUNICATION WITH VEHICLE SECURITY CONTROL MODULE
(SKREEM/WCM)
For a complete wiring diagram Refer to Section 8W.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
U0184-LOST COMMUNICATION WITH RADIO
For a complete wiring diagram Refer to Section 8W.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
U0186-LOST COMMUNICATION WITH AUDIO AMPLIFIER
For a complete wiring diagram Refer to Section 8W.
(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.
WK
AUDIO/VIDEO SYSTEMS - ELECTRICAL DIAGNOSIS
8A - 151
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