Jeep Grand Cherokee WK. Manual — part 638

U0020-CAN B BUS OFF PERFORMANCE–ORC (CONTINUED)

3.

CHECK (D55) CAN B BUS (+) CIRCUIT FOR AN OPEN

Turn the ignition off.

Disconnect the negative battery cable.

Disconnect the OCM C1 connector.

Disconnect the Front Control Module (FCM) C1 connector.

Measure the resistance of the (D55) CAN B Bus (+) circuit between
the Front Control Module C1 connector and the ORC C2 connector.

Is the resistance below 2.0 ohms?

Yes

>> Go To 4

No

>> Repair the (D55) CAN B Bus (+) circuit for an open.

Perform ORC VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/RESTRAINTS - DIAGNOSIS AND TEST-
ING)

4.

CHECK (D54) CAN B BUS (–) CIRCUIT FOR AN OPEN

Measure the resistance of the (D54) CAN B Bus (–) circuit between
the Front Control Module C1 connector and the ORC C2 connector.

Is the resistance below 2.0 ohms?

Yes

>> Replace the ORC in accordance with the Service Informa-

tion.

Perform ORC VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/RESTRAINTS - DIAGNOSIS AND TEST-
ING)

No

>> Repair the (D54) CAN B Bus (–) circuit for an open.

Perform ORC VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/RESTRAINTS - DIAGNOSIS AND TEST-
ING)

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RESTRAINTS - ELECTRICAL DIAGNOSTICS

WK

U0022-CAN B BUS (+) CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.

U0023-CAN B BUS (+) CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.

U0026-CAN B BUS (-) CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

(Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for the diagnostic
test procedure.

U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS)
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.

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.

WK

RESTRAINTS - ELECTRICAL DIAGNOSTICS

8O - 375

U0159-LOST COMMUNICATION WITH PARKING ASSIST 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.

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.

U0167-LOST COMMUNICATION WITH INTRUSION TRANSCEIVER 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.

U0169-LOST COMMUNICATION WITH SUNROOF 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.

8O - 376

RESTRAINTS - ELECTRICAL DIAGNOSTICS

WK

U0170-LOST COMMUNICATION W/UP-FRONT LEFT SATELLITE ACCELERATION
SENSOR

WK

RESTRAINTS - ELECTRICAL DIAGNOSTICS

8O - 377