B1338

Diagnostic trouble code B1338 - Passenger airbag, resistance too low.

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

2. The fault is intermittent. Try to provoke the fault when taking each measurement during fault diagnosis.
Manipulate connectors and leads and turn the steering wheel while taking measurements.

Proceed to point 3.

3. Switch off the ignition and remove the negative lead from the battery. Undo the bolts that secure the steering wheel airbag. Unplug the connector on the reverse of the airbag and connect reference resistor 84 71 153 to the connector.

Remove the glove compartment and unplug the connector on the underside of the passenger airbag. Connect reference resistor 84 71 153 to the connector.

Proceed to point 4.

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4. Refit the negative battery lead and switch on the ignition. Erase the 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: Proceed to point 6.
If the diagnostic trouble code does not return: The fault is in the passenger airbag. Conduct an extra test as described in point 5.

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

Refit the negative battery lead 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: Switch off the ignition and remove the negative battery lead. Change the passenger airbag. Then proceed to point 7.
If the diagnostic trouble code does not return:
Switch off the ignition and remove the negative battery lead. Unplug the connector from the airbag and then proceed to point 6.

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6. Switch off the ignition and remove the reference resistor from the passenger airbag connector.
Check the cable assembly by connecting a BOB to the SRS control module connector. Connect an ohmmeter between contacts 13 and 14 on the BOB.
The ohmmeter should show infinite resistance.
If the value is OK: Proceed to point 7.
If the value is incorrect: There is a short circuit on the cable assembly between the SRS control module and the passenger airbag. Investigate the cause and change the cable assembly. Then proceed to point 7.

7. Switch off the ignition and remove the negative battery lead.
Remove the reference resistors and plug in all connectors to their original components. Refit the negative battery lead and switch on the ignition.
Erase the diagnostic trouble code. Switch off the ignition and switch it back on again. Wait for at least 10 seconds.
Check the 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.