Question about 2001 BMW 5 Series

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I have successfully fitted a Towsure tow bar to my 1999 BMW 530D Saloon. Additionally, I have attempted to wire a 12N socket using a TEB7AS Universal Bypass Relay, Inc Buzzer; using the typical wiring diagram from the Haynes Service and Repair Manual for the BMW 5-Series Apr 1996 to Aug (N to 03 reg) connection to vehicle loom in offside rear compartment (near battery) as follows: Signal Wire Yellow N/S flasher Blue/Green Blue Fog Lamp Yellow/Black Green O/S flasher Blue/Brown Brown O/S Tail Lamp White/Brown Red Brake Lamp Black/Brown Black N/S Tail Lamp Grey/Green Grey Reverse Lamp White/Yellow White Earth Whilst there is power to various combinations of lights, only the offside flasher operates when it should. I would appreciate the information necessary to ensure the correct wiring.

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This kind of problem can be confusing with so many different connections. I guess you need to think through the connections logically. Get your self a test lamp or volt meter and make sure each of the incoming wires you have tapped into actually does have the signal that you are expecting it to have. Make sure that the main input power for the relay has a voltage on it when you are expecting it to. The specs that I read said that it should be wired back to the battery? Check that your earths are good. You can do this with the Ohm / continuity function on a cheap multi meter. If that all works then you may have a faulty relay. (Stranger things have happened). With your test lamp and some hook up wire you should be able to simulate the incoming signals for flashers and brakes lights etc and put your test light on the outputs. Sorry no magic answer but if you work at the problem one step at a time you should be able to find whatever it is your missing. Hope this helps. Doug.

Posted on Jul 26, 2009

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