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B2333, B2338

B2333, B2338

Airbag driver/passenger, short-circuit to battery plus

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 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.


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 7.

If the diagnostic trouble code does not return:

The fault is in the driver or passenger airbag (if fitted). Perform 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 on the driver's side 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 11.

If the diagnostic trouble code does not return:

If the car is fitted with an airbag on the passenger side, perform an extra check as described in point 6. If the car is not fitted with an airbag on the passenger side, turn off the ignition and remove the negative battery cable. Unplug the connector from the steering wheel airbag.

Refit the negative cable on the battery and then go on to point 7.

6. Turn off the ignition and remove the negative battery cable. Reconnect the reference resistor to the airbag connector on the driver's side.


Remove the reference resistor from the passenger airbag connector and connect the passenger 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, remove the negative battery cable and change the airbag on the passenger side. Then go to point 11.

If the diagnostic trouble code does not return:

Turn off the ignition and remove the negative battery cable. Unplug the connector from the passenger airbag and reconnect the reference resistor.

Refit the negative cable on the battery and then go on to point 7.

7. Turn off the ignition and remove the reference resistor from the airbag connector on the driver's side.


Remove the connector from the SRS control module and connect a BOB to the wiring harness.

Turn on the ignition and connect a voltmeter between connection 10 on BOB and a good grounding point. Then connect a voltmeter between connection 11 and a good grounding point.

In both cases, the voltmeter should read 0 V.

If the value is OK:

If the car is equipped with an airbag on the passenger side, go to point 10.

If the car is not fitted with an airbag on the passenger side, go to point 11.

If the value differs:

Go to point 8.

8. Turn off the ignition and unplug connector H2-52. Turn on the ignition.


Connect a voltmeter between connection 10 on BOB and a good grounding point. Then connect a voltmeter between connection 11 on BOB and a good grounding point.

The voltmeter should read 0 V.

If the value is OK:

Go to point 9.

If the value differs:

If any of the readings indicates a voltage, there is an overload to the battery voltage on the corresponding lead between the SRS connector and connector H2-52. Locate the cause and change the wiring harness. Then go to point 11.

9. Connect a voltmeter between pin 1 and connector H2-52 from the contact roller and a good grounding point. Then connect a voltmeter between pin 3 and a good grounding point.


The voltmeter should read 0 V.

If the value is OK:

If the car is equipped with an airbag on the passenger side, go to point 10.

If the car is not fitted with an airbag on the passenger side, go to point 11.

If the value differs:

If any of the readings indicates a voltage, the fault is in the contact roller. Change the contact roller and then go to point 11.

10. Turn off the ignition and remove the reference resistor from the passenger airbag connector. Turn off the ignition.


Connect a voltmeter between connection 13 on the BOB and a good grounding point. Then connect a voltmeter between connection 14 on BOB and a good grounding point.

In both cases, the voltmeter should read 0 V.

If the value is OK:

Go to point 11.

If the value differs:

If any of the readings indicates a voltage, there is an overload to battery voltage on the corresponding lead. Locate the cause and change the wiring harness. Go to point 11.


11. 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 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 codes return.

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.