BMW 3series Alarm fault

September 21, 2019   |   Author: Neil Whiston   |   No comments   |   Categories: Uncategorized

This 3 series came to us after the dealer said there was nothing wrong with it.

The alarm was going off intermittantly.

A quick code read showed several faults

Testing the car seemed to show no faults .

But looking at the BMW site it showed a TSB (technical service bulletin) for this fault. The switches in the door become worn with age and set the alarm off.

The solution is to reprogram the frm module and this gives the switches larger tolerances so alarm doesn’t go off.

We order the correct file
Download it to the car
Depending on size of file this can take minutes or hours to download.
A stable battery voltage is essential during this process. If battery goes flat during programming it would damage the module.

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