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Car Forum / Nissan / Nissan Cars / April 2005nissan 300zx electrical problem
I have a '96 300zx NA. Recently I have been having problems with the horn going off when the headlights are on. The nissan dealer service shop traced the problem to a faulty diode (near the glove compartment) with some exposed wires. It seems any time the wires are hit by any moisture, the horn goes haywire. The problem only happens when driving in the wet. The service shop said the problem required around a week's worth of work to dismantle the dash and fix the faulty diode. They also recommended taking it in to a body shop to fix any leaks in the body so that water does not spray into the diode compartment. Before going ahead with this obviously expensive repair, I was looking to see if anyone here has any suggestions on a cheaper alternative. Has anyone else had this problem and if they did, were they hit with a big repair bill? Thanks for any advice. Would have to see wiring diagram to see any possible connection between horn, headlights, and diode... The part about the moisture on the diode is quite puzzling. Never saw a diode problem caused by moisture. Kind of makes me suspicious about the whole diagnosis story. Professor www.telstar-electronics.com normally a diode would be in the power distribution center underhood not quite sure i buy the diode diagnosis either sounds more like a short somewhere in the system i have 10 yr electrical manual for imported cars would have to check circuits to see if there is any correlation to the 2 circuitsand see if any diode in circuit. > Would have to see wiring diagram to see any possible connection between > horn, headlights, and diode... The part about the moisture on the diode [quoted text clipped - 3 lines] > Professor > www.telstar-electronics.com The tech also mentioned something about the security system being connected to the whole issue. Supposedly, that diode controls the security system, horn and headlights. The latest manifestation is that if the car has been standing in rain, the high beam goes on and stays on even when the car is turned off. This results in battery drainage and the car having to be jump started. As soon as the weather dries up, the problem is gone. I get the feeling I am being fleeced by my dealer so I appreciate your feedback so I can make a more informed decision. Thanks. <djmcreynol...@bellsouth.net> wrote: > normally a diode would be in the power distribution center underhood not > quite sure i buy the diode diagnosis either sounds more like a short [quoted text clipped - 8 lines] > > Professor > > www.telstar-electronics.com OK, that makes more sense... about the function of the diode being part of an alarm system. Seems to me that you might have some issues with the alarm. Have you tried disconnecting the alarm system to see if the problem disappears? Professor www.telstar-electronics.com > The tech also mentioned something about the security system being > connected to the whole issue. Supposedly, that diode controls the [quoted text clipped - 25 lines] > > > Professor > > > www.telstar-electronics.com At the time, I had asked the tech and he said that the problem would not go away if the alarm was disconnected. He recommended replacing the part. I can have the dealer disconnect the alarm and see if that helps. > OK, that makes more sense... about the function of the diode being part > of an alarm system. Seems to me that you might have some issues with [quoted text clipped - 36 lines] > > > > Professor > > > > www.telstar-electronics.com Nissan uses diodes in the body of the car to do things like have both doors work the dome lamp, but only the drivers door triggers the 'key left in ignition' sensor or the 'headlights on' reminder, etc... I ran into it installing an alarm in a 93 SE-R. (diode was built into a connector in the drivers kick panel) Gary K > At the time, I had asked the tech and he said that the problem would > not go away if the alarm was disconnected. He recommended replacing [quoted text clipped - 51 lines] >> > > > Professor >> > > > www.telstar-electronics.com
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