U0019-CAN B BUS

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 U0019 CAN B BUS DTC IN TOTALLY INTEGRATED POWER MODULE (TIPM)

(D55) CAN B BUS (+) CIRCUIT OPEN

(D54) CAN B BUS (-) CIRCUIT OPEN

OCCUPANT RESTRAINT CONTROLLER (ORC)

Diagnostic Test

1. VERIFY DTC U0019-CAN B BUS IS ACTIVE

Turn the ignition on.
With the scan tool, read ORC DTCs.

Does the scan tool display active: U0019-CAN B BUS?

Yes

Go To 2

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 *AIRBAG SYSTEM VERIFICATION TEST - VER 1.

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

With the scan tool, read TIPM DTCs

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

Yes

Diagnose and repair the DTC(s). (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING)

Go To 3

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

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

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

Disconnect the ORC C2 connector.

NOTE: Check connectors - Clean and repair as necessary.

Connect the Load Tool ORC 8443-25 Adaptor to the ORC C2 connector.
Disconnect the TIPM C7 connector.
Measure the resistance of the (D55) CAN B Bus (+) circuit between the TIPM C7 connector and the ORC C2 connector.

Is the resistance below 2.0 ohms?

Yes

Go To 4

Repair the (D55) CAN B Bus (+) circuit for an open.
Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.

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

Measure the resistance of the (D54) CAN B Bus (–) circuit between the TIPM C7 connector and the ORC C2 connector.

Is the resistance below 2.0 ohms?

Yes

Replace the ORC in accordance with the Service Information.

Repair the (D54) CAN B Bus (–) circuit for an open.
Perform *AIRBAG SYSTEM VERIFICATION TEST - VER 1.