Quote:
Originally Posted by nhdoc
I would hope there would be a way to test the NSS without having to replace it under suspicion, although it sounds like your is probably the cause of the problem you are having. I had an intermittent no-crank condition on my '98 when I first bought it but it would not be cured by moving the shifter like yours was - mine happened on hot days when the engine bay was hot. At first I thought it might be the NSS but it turned out to be a small black "cube" relay in the right-front electronics box under the hood.
I was able to isolate it to that part first by unplugging relays and trying to start the car...when I found the right one the car would not crank - same as the condition I had experienced. The next time the "no crank" occurred I tapped the relay while my wife held the key in the start position and sure enough the starter began turning.
I replaced that relay (around $15) and never had the problem again. Like I said, it sounds to me like yours is the NSS but I posted this for other W210 owners who might experience a similar no-crank issue.
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The intermittent nature of a lot of electrical problems often make them difficult to test; even when there is a test procedure in the manual.
As a test it is often easier to get a piece of wire and bypass a switch and see if the problem goes away.
Unfortunately some connectors are multi use and with out a Wiring diagram or if the wires can be traced bypassing can cause problems.
Example ; On a 123 I believe the Neutral Safety Switch also doubles as a Back-up Light switch.
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84 300D, 82 Volvo 244Gl Diesel
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