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B1332

B1332

Airbag driver, 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.

Important

If no fault can be shown while testing, the contact roller should be changed. The contact roller is the most common cause for intermittent faults.


Go to point 3.

3. Turn off the ignition and remove the negative cable on the battery. Remove the bolts securing the driver's airbag. Unplug the connector on the back of the airbag and connect the reference resistor 84 71 153 to the connector.


On cars with airbag on passenger side;

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

3.b. 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 driver's 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 airbag connector and connect the airbag. 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 steering wheel airbag. Then go to point 10.

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 and unplug the connector from the SRS control module. Check pins 10 and 11 for open circuits/loose connections.


Refit the connector 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 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 to point 10.

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 connector H2-52 and check the pin and sleeves for open circuits/loose connections.


Put the connector back together. Turn on the ignition and clear the fault code. 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 8.

If the diagnostic trouble code does not return:

The fault was in the connector. Go to point 10.

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.


8. Turn off the ignition. Unplug connector H2-52 and remove the reference resistor from the airbag connector. Change the contact roller. Put the connector together and reconnect the reference resistor.


Turn on the ignition and clear the diagnostic trouble 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 9.

If the diagnostic trouble code does not return:

The fault was in the contact roller. Go on to point 10.

9. Turn off the ignition and check the wiring harness by connecting a BOB to the SRS control module connector. Connect an ohmmeter between connections 10 and 11.


The ohmmeter should read 3-4 ohms.

If the value is OK:

Go to point 10.

If the value differs:

Locate the cause and change the wiring harness. Then go on to point 10.

10. 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 fault 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.