Diagnostic Test

1) DETERMINE ACTIVE OR STORED DTC
NOTE: Ensure that the battery is fully charged.

NOTE: The scan tool, SRS Airbag Load Tool MRL 8443, and DVOM are required to perform the following test.

Turn the ignition on.

Select ACTIVE or STORED DTC:

ACTIVE DTC
1. Go To 2).
STORED DTC
1. Go To 5).
2) CHECK FOR OPEN SQUIB CIRCUITS IN PASSENGER AIRBAG

Fig 1: Checking Passenger Airbag Squib Circuits
Courtesy of DAIMLERCHRYSLER CORP.

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

Disconnect the Passenger Airbag Squib connector.

NOTE: Check connectors - Clean and repair as necessary.

Connect the 8443 Load Tool to the Passenger Airbag Squib connector.

WARNING: To avoid personal injury or death, turn the ignition on, then reconnect the battery.

With the scan tool, read the active ORC DTCs.

Does the scan tool display: B1B0A-PASSENGER AIRBAG SQUIB 1 CIRCUIT OPEN?

Yes
1. Go To 3).
No
1. Replace the Passenger Airbag in accordance with the Service Information.
2. Perform the *AIRBAG SYSTEM VERIFICATION TEST - VER 1 .
3) CHECK (R42) PASSENGER SQUIB 1 LINE 2 CIRCUIT FOR AN OPEN

Fig 2: CHECKING PASSENGER SQUIB 1 LINE 2 CIRCUIT
Courtesy of DAIMLERCHRYSLER CORP.

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

Disconnect the 8443 Load Tool from the Passenger Airbag Squib connector.

Disconnect the ORC connectors.

NOTE: Check connectors - Clean and repair as necessary.

Connect the 8443 Load Tool ORC Adaptor to the ORC C2 connector.

Measure the resistance of the (R42) Passenger Squib 1 Line 2 circuit between the Passenger Airbag Squib connector and the 8443 ORC Adaptor.

Is the resistance below 1.0 ohm?

Yes
1. Go To 4).
No
1. Repair the (R42) Passenger Squib 1 Line 2 circuit for an open.
2. Perform the *AIRBAG SYSTEM VERIFICATION TEST - VER 1 .
4) CHECK (R44) PASSENGER SQUIB 1 LINE 1 CIRCUIT FOR AN OPEN

Fig 3: CHECKING PASSENGER SQUIB 1 LINE 1 CIRCUIT
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance of the (R44) Passenger Squib 1 Line 1 circuit between the Passenger Airbag Squib connector and the 8443 ORC Adaptor.

Is the resistance below 1.0 ohm?

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 personal injury or death.
1. Replace the ORC in accordance with Service Information.
2. Perform the *AIRBAG SYSTEM VERIFICATION TEST - VER 1 .
No
1. Repair the (R44) Passenger Squib 1 Line 1 circuit for an open.
2. Perform the *AIRBAG SYSTEM VERIFICATION TEST - VER 1 .
5) CHECKING STORED OR INTERMITTENT CODES
NOTE: Diagnose and repair all active codes before diagnosing stored codes. Refer to DIAGNOSTIC CODE INDEX table.

With the scan tool, record and erase all Airbag System Module DTCs.

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

Using the wiring diagram/schematic as a guide, inspect the related wiring and connectors for chafed, pierced, pinched, and partially broken wires, and for broken, bent, pushed out, corroded, and contaminated terminals. Repair as necessary.

Reconnect all disconnected components and harness connectors.

WARNING: To avoid personal injury or death, turn the ignition on, then reconnect the battery.

With the scan tool, monitor for active codes while performing the following:
- Wiggle the wiring harness and connectors of the related airbag circuit.
- Continue the test until either a code becomes active or the problem area is isolated.
In the previous steps you have attempted to recreate the conditions responsible for setting the DTC in question/causing the intermittent condition.

Are any ACTIVE DTCs present?

Yes
1. Select the appropriate diagnostic procedure from the DIAGNOSTIC CODE INDEX table.
No
1. No problem found at this time. Erase all codes before returning the vehicle to the customer.