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B1227

B1227

Bulb for SRS symbol, short-circuiting 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.












The SRS lamp does not shine 3-4 seconds after turning on the ignition. The bulb is connected to pin 7 on the control board.

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. Expose the main instrument unit and replace the SRS bulb. Turn on the ignition.


The lamp should go on for 3-4 seconds after the ignition has been turned on.

If the lamp comes on.

The fault was in the lamp. Go to point 6.

If the lamp does not come on:

Go to point 4.

4. Turn off the ignition and remove the negative cable on 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;

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

4.b. Connect the Reference resistor 84 71 153 to the connector.

Go to point 5.

5. Unplug the SRS control module connector and connect a BOB to the wiring harness. Unplug the connector from the main instrument unit.


Instruments with central warning lamp:

55-pin connector.

Instruments without central warning lamp:

12-pin connector (12P-2) behind the fuel gauge.



Reconnect the negative cable on the battery and turn on the ignition. Connect a voltmeter between connection 7 on the BOB and a good grounding point.

The voltmeter should read 0 V.

If the value is OK:

Go to point 6.

If the value differs:

If the reading shows battery voltage there is a fault in the wiring harness between the main instrument connector and the SRS control module connector.

Turn off the ignition and locate the cause of the fault. Replace the wiring harness.

Then go to point 6.

6. 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 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.