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B1337

B1337

Airbag passenger, open circuit

The reference resistor is available in two versions. A newer, part no. 86 12 095 , and an older, part no. 84 71 153 . The new type has closer tolerance limits and should be used for more reliable diagnosis. The illustrations in the following chapter show the older type of reference resistor.


















Diagnostic procedure


1. Connect the diagnostic tool. Note the diagnostic trouble code and type of fault.


P=permanent fault, I=intermittent fault.

If the fault is permanent:

Go to point 3.

If the fault is intermittent:

Go to point 2.

2. The fault is intermittent. Try to provoke the fault at each test section in the continued fault diagnosis.

Move the connectors and cables and turn the steering wheel while testing.

Go to point 3.

3. Turn off the ignition and remove the negative cable from the battery. Undo the bolts securing the steering wheel airbag. Unplug the connector from the back of the airbag and connect the reference resistor 84 71 153 to the connector.


Remove the glove-box and unplug the connector on the back of the passenger airbag.

Connect the reference resistor 84 71 153 to the connector.

Go to point 4.

4. Refit the negative cable to the battery and turn on the ignition. Clear the fault codes. Turn off the ignition and turn it 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:

Go to point 6.

If the diagnostic trouble code does not return:

The fault lies in the airbag. Carry out an extra check as described in point 5.

5. Turn off the ignition and remove the negative cable on the battery. Remove the reference resistor from the passenger airbag connector and connect the passenger airbag to the connector.


Refit the negative cable on the battery and turn 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:

Turn off the ignition and remove the negative cable on the battery. Change the passenger airbag. Then go to point 8.

If the diagnostic trouble code does not return:

Turn off the ignition and remove the negative cable on the battery. Unplug the connector from the airbag and refit the reference resistor. Refit the negative cable on the battery and then go on to point 6.

6. Turn off the ignition. Expose the SRS control module. Unplug the connector from the SRS control module and check sleeve 13 and 14 for open circuits/loose connections. Refit the connector to the SRS control module and turn on the ignition. Clear the fault codes. Turn off the ignition and turn it on again. Wait at least 10 seconds with the ignition on.


Check to see if the diagnostic trouble code returns.

If the diagnostic trouble code returns:

Go to point 7.

If the diagnostic trouble code does not return:

The fault lies in the SRS connector. Go on to point 8.

Important

If a fault is not found in the connector the fault can be intermittent. Try to provoke a possible intermittent fault and see if the SRS lamp comes on.


7. Turn off the ignition. Unplug the connector from the SRS control module and connect a BOB. Connect an ohmmeter between connections 13 and 14 on BOB.


The ohmmeter should read 2-3 ohms.

If the value is OK:

Go to point 8.

If the value differs:

If the ohmmeter indicates a high resistance there is an open circuit in the wiring harness between the SRS control module and the airbag on the passenger side. Locate the cause and replace the wiring harness. Then go on to point 8.

8. Turn off the ignition and remove the negative cable on the battery. Remove the reference resistor and plug in all the connectors to their original components. Reconnect the negative cable on the battery and turn on the ignition.


Clear the diagnostic trouble code. Turn off the ignition and turn it on again. Wait for at least 10 seconds.

Check to see if the diagnostic trouble code returns.

If the diagnostic trouble code returns:

Go to section: Procedure for replacing the control module .

If the diagnostic trouble code does not return:

Restore the car.