B1338

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




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 intermittent: Proceed to point 2.

2. The fault is intermittent: Try to expose the fault when taking each reading during fault tracing. Manipulate the connectors and cables and turn the steering wheel when taking measurements.

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. Connect reference resistor 84 71 153 to the connector. Remove the lower cover plate and unplug connector H2-77 to the passenger airbag. Connect reference resistor 84 71 153 to 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 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: Proceed to point 6.
If the diagnostic trouble code does not return: The fault was in the passenger airbag. Conduct extra tests as described in point 5.

5. Switch off the ignition and disconnect the negative lead from the battery. Remove cable assembly 86 11 378 complete with reference resistor from the airbag connector and plug in the passenger 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 passenger airbag. Then proceed to point 7.
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 and remove cable assembly 86 11 378 complete with the reference resistor.
Check the cable assembly by connecting a BOB to the SRS control module connector on the cable assembly. Connect an ohmmeter between contacts 13 and 14 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 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 disconnect the negative lead from the battery.
Remove reference resistors and plug in all connectors to their original components. Reconnect the battery negative 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.