Question about 1992 BMW 3 Series

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740i 1992 BMW - Hazard Lights and Crash Relay

Our hazard lights juyst suddenly turn on while driving. i have searched the web and found that it could be the crash relay. but our next problem is finding the crash relay. does anyone know of a diagram showing the 'crash relay'??

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Am sorry but i think you have a problem with the switch. you can make sure by disconnecting the hazard switch. it was badly placed from the begining on your model and is very vulnerable to dirt and can easily be fixed by simply cleaning and blowing clean.

Posted on Aug 11, 2008

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The switch can be tested disconnecting it from wires, and using an Ohmmeter on its contact to ensure it is opening and closing fine, and not sticking.

If the switch is fine, wiring, alarm system and crash sensor must be tested. The most common reason for this kind of problem is the switch itself.

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