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The SRS lamp goes on dimly and DTC not shown

The SRS lamp goes on dimly and DTC not shown

No diagnostic trouble code, no contact with the system.

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. Check fuse 18.


2. Turn off the ignition and remove the negative cable on the battery. Undo the bolts securing the steering wheels airbag. Remove the connector on the back of the airbag and connect the reference resistor 84 71153 to the connector.


On cars with airbag on passenger side;

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

2.b. Connect the reference resistor 84 71 153 to the connector.

Go to point 3.

3. Unplug the SRS control module connector and check pin 5 for open circuits/loose connections.


Plug in the connector to the SRS control module. Reconnect the negative battery cable and turn on the ignition. The SRS lamp should go on for 3-4 seconds and then go out.

If the lamp goes out:

The fault was in the connector. Restore the car.

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.


If the lamp does not go out:

Go to point 4.

4. Turn off the ignition. Unplug 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 5 on BOB and a good grounding point.


The voltmeter should indicate 7-16 V.

If the value is OK:

Go to section: Procedure for replacing the control module .

If the value differs:

If there is no battery voltage, check the wiring harness between fuse 18 and the SRS control module for open circuits. Change the wiring harness if there is a fault.