Diagnostic Test

1) VERIFY DTC U0019-CAN B BUS IS ACTIVE
Turn the ignition on.

With the scan tool, read Occupant Restraint Controller (ORC) DTCs.

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

Yes
1. Go To 2).
No
1. 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.
2. Perform ORC VERIFICATION TEST - VER 1. Refer to *ORC VERIFICATION TEST - VER 1 .
2) CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE FRONT CONTROL MODULE (FCM)
With the scan tool, read Front Control Module (FCM) DTCs

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

Yes
1. Diagnose and repair the DTC(s).(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING)
No
1. Go To 3).
3) CHECK (D55) CAN B BUS (+) CIRCUIT FOR AN OPEN

Fig 1: Measuring Resistance Between Front Control Module C1 Connector & ORC C2 Connector
Courtesy of DAIMLERCHRYSLER CORP.

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 8443-24 Adaptor to the ORC C2 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
1. Go To 4).
No
1. Repair the (D55) CAN B Bus (+) circuit for an open.
2. Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1. Refer to *AIRBAG SYSTEM VERIFICATION TEST - VER 1 .
4) CHECK (D54) CAN B BUS (-) CIRCUIT FOR AN OPEN

Fig 2: Measuring Resistance Between Front Control Module C1 Connector & ORC C2 Connector
Courtesy of DAIMLERCHRYSLER CORP.

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
1. Replace the ORC in accordance with the Service Information.
No
1. Repair the (D54) CAN B Bus (-) circuit for an open.
2. Perform AIRBAG SYSTEM VERIFICATION TEST - VER 1. Refer to *AIRBAG SYSTEM VERIFICATION TEST - VER 1 .