850 No reverse lights - PNP switch? No diag code (?)

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Randy MacKenna - 22 Jun 2004 04:35 GMT

I have a 1997 850GLT, and the reverse lights have quit working.
Sockets, bulbs and fuse are all good. I tried the 'cleaning' routine
of shifting rapidly from P to L about 20 times -- still no reverse
lights.

Q1: If the PNP switch is bad, should I expect the check engine light
to be on, and have a code available to read? I'm not getting any
codes, and the performance/operation of the car is normal.

Q2: Is it highly probable that the PNP switch is what I need to
replace, given that my reverse lights are not working, and the
bulbs/fuse check out okay?

I just hate to go through the PNP switch replacement if it might end
up not being the problem...

Thanks,
Randy

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Doug Warner - 23 Jun 2004 02:37 GMT

>I have a 1997 850GLT, and the reverse lights have quit working.
>Sockets, bulbs and fuse are all good. I tried the 'cleaning' routine
[quoted text clipped - 4 lines]
>to be on, and have a code available to read? I'm not getting any
>codes, and the performance/operation of the car is normal.

No, since the contacts that control the reversing light are probably
separate from the ones the feed the TCU.

>Q2: Is it highly probable that the PNP switch is what I need to
>replace, given that my reverse lights are not working, and the
>bulbs/fuse check out okay?

Yes, at least in my 94, the PNP switch controls the reversing lights.

>I just hate to go through the PNP switch replacement if it might end
>up not being the problem...

You could short the correct two pins together in the harness connector
for the PNP switch and see if the lights come on. Unfortuntely, I
wouldn't trust the pinout to match for the 94, unless the switches are
the same part #. If you can determine if it's the same, I can scan
the page that shows the pins for you.

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