U0020-CAN B BUS OFF PERFORMANCE–ORC





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    Continuously

  • Set Condition:

    Whenever the CAN B Bus (+) or CAN B Bus (-) circuit is open, shorted to voltage, or shorted to ground.


Possible Causes
  
ACTIVE U0020 CAN B BUS DTC IN OCCUPANT CLASSIFICATION MODULE
  
(D55) CAN B BUS (+) CIRCUIT OPEN
  
(D54) CAN B BUS (-) CIRCUIT OPEN
  
OCCUPANT RESTRAINT CONTROLLER (ORC)
  



Diagnostic Test

1.VERIFY DTC U0020-CAN B BUS OFF PERFORMANCE–ORC IS ACTIVE




Does the scan tool display active: U0020-CAN B BUS OFF PERFORMANCE–ORC?

Yes
  • Go To 2


No
  • If the DTC is stored, check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
  • Perform *ORC VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/RESTRAINTS - DIAGNOSIS AND TESTING)

2.CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE FRONT CONTROL MODULE (FCM)



Does the scan tool display any active CAN B BUS related DTCs?

Yes


No
  • Go To 3

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










Is the resistance below 2.0 ohms?

Yes
  • Go To 4


No

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





Is the resistance below 2.0 ohms?

Yes


No