Restraints

U0019-CAN B BUS





For a complete wiring diagram Refer to Diagrams/Electrical.


- When Monitored:
Continuously

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







Diagnostic Test


1. VERIFY DTC U0019-CAN B BUS IS ACTIVE
Turn the ignition on.
With the scan tool, read Occupant Restraint Controller (ORC) DTC.
Does the scan tool display active: U0019-CAN B BUS?

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.Occupant Restraint Controller (ORC) Verification Test



2. CHECK FOR ACTIVE CAN B BUS RELATED DTC IN THE TOTALLY INTEGRATED POWER MODULE (TIPM)
With the scan tool, read Totally Integrated Power Module (TIPM) DTC
Does the scan tool display any active CAN B BUS related DTC?

Yes


- Diagnose and repair the DTC. Testing and Inspection


No


- Go To 3



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




WARNING: To avoid serious or fatal injury, turn the ignition off, disconnect the battery and wait two minutes before proceeding.

Turn the ignition off.
Disconnect the ORC connectors.
Disconnect the Totally Integrated Power Module (TIPM) C6 connector.
Measure the resistance of the (D55) CAN B Bus (+) circuit between the Totally Integrated Power Module (TIPM) C6 connector and the ORC connector 24 way cavity 3.
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.Occupant Restraint Controller (ORC) Verification Test



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




Measure the resistance of the (D54) CAN B Bus (-) circuit between the Totally Integrated Power Module (TIPM) C6 connector and the ORC connector 24 way cavity 4.
Is the resistance below 2.0 ohms?

Yes


-
WARNING: If the Occupant Restraint Controller (ORC) is dropped at any time, it must be replaced. Failure to take the proper precautions can result in accidental airbag deployment and serious or fatal injury.

- Replace the ORC.
- Perform *ORC VERIFICATION TEST - VER 1.Occupant Restraint Controller (ORC) Verification Test


No


- Repair the (D54) CAN B Bus (-) circuit for an open.
- Perform *ORC VERIFICATION TEST - VER 1.Occupant Restraint Controller (ORC) Verification Test