B1333

Diagnostic trouble code B1333 - Driver airbag, resistance too low

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1. Connect ISAT Note the diagnostic trouble code and the type of fault. P=permanent fault, 1= intermittent fault.
If the fault is permanent: Proceed to point 3.
If the fault is intermiffent: Proceed to point 2.

2. The fault is intermittent. Try to provoke the fault when taking measurements during fault diagnosis.
Manipulate connectors and leads as well as turning the steering wheel while taking measurements.

NOTE: If no fault can be demonstrated while taking measurements, change the contact roller. The contact roller is the most common cause of intermittent faults.

Proceed to point 3.

3. Switch off the ignition and remove the negative lead from the battery. Unscrew the steering wheel airbag and unplug the connector on the back of the airbag. Plug in reference resistor 84 71 153 to the connector.

On Cars With A Passenger Airbag
a. Remove the lower cover plate and unplug connector H2-77 to the passenger airbag.
b. Connect reference resistor 84 71 153 to pin connector H2-77 using cable assembly 86 11 378.

Proceed to point 4.

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4. Reconnect the negative battery lead and switch on the ignition. Erase diagnostic trouble code. Switch off the ignition and switch it back on, wait for at least 10 seconds with the ignition on.
Check to see if the diagnostic trouble code returns.
If the diagnostic trouble code returns: Proceed to point 6.
If the diagnostic trouble code does not return: The fault is in the airbag. Conduct extra tests as described in point 5.

5. Switch off the ignition and disconnect the negative lead from the battery. Remove the reference resistor from the airbag connector and plug in the airbag.

Refit the negative lead to the battery and switch on the ignition. Wait for at least 10 seconds with the ignition on.
Check to see if the diagnostic trouble code returns.
If the diagnostic trouble code returns: Change the steering wheel airbag. Then proceed to point 8.
If the diagnostic trouble code does not return: The fault is intermittent. Return to point 2.

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6. Switch off the ignition. Unplug the connector from the SRS control module and connect a BOB. Unplug connector H2-52. Connect an ohmmeter between contacts 10 and 11 on the BOB.
The ohmmeter should show infinite resistance.
If the reading is OK: Proceed to point 7.
If the reading is incorrect: There is a short circuit in the cable assembly between connector H2-52 and the connector to the SRS control module. Investigate the cause and change the cable assembly. Then proceed to point 8.

7. Change the contact roller. Fit a reference resistor to the connector for the steering wheel airbag. Plug in connector H2-52 and reconnect the connector to the SRS control module. Switch on the ignition and erase the diagnostic trouble code. Switch off the ignition and switch it back on, wait for at least 10 seconds with the ignition on.
Check to see if the diagnostic trouble code returns.
If the diagnostic trouble code returns: Description of On-Board Diagnostics
If the diagnostic trouble code does not return: The fault was in the contact roller. Proceed to point 8.

8. Switch off the ignition and disconnect the negative lead from the battery.
Remove the reference resistor and plug in all connectors to their original components. Refit the negative battery lead and switch on the ignition.

Erase diagnostic trouble code. Switch off the ignition and switch it back on again. Wait for at least 10 seconds with the ignition on. - Check to see if the diagnostic trouble code returns.
If the diagnostic trouble code returns: Description of On-Board Diagnostics
If the diagnostic trouble code does not return: Return the car to good order.