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|5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)|
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| Originally posted by Torque+Aug 20 2005, 12:53 PM--><div class='quotetop'>QUOTE(Torque @ Aug 20 2005, 12:53 PM)</div><div class='quotemain'><!--QuoteBegin-BEX@Aug 19 2005, 07:57 PM |
Please no one reply I am SOL!
Originally Posted by yrshaik
Greetings. I drive a 528i e39. One bright headlight stopped working.
Swopping the bulbs around did not change the symptom.
Being an electronics engineer, i delved into this problem myself. Firstly, there was no voltage present at the particular headlight plug. I took note of the cable colours and proceeded to trace it to it's voltage source. This was a most difficult task.
I eventually learnt that the lights were controlled by a module located in a recess behind the bonnet catch. The bonnet catch lever and the kick panel must be removed. The module is attached by a bolt at the bottom end and a "clip" at the top. Once the bolt is removed, the module can be pulled downwards to release it from the upper "clip".
I found the relevent coloured wires from the faulty headlight and traced it to a defective electronic switching device (ic) within the module. I could find no specs. or replacement for this ic. A replacement lcm cost a fortune, so i decided to solve this problem by building a relay circuit within the module, to replace the faulty ic.
It's been almost a year since and it still works.
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