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1996 850 - trip computer issue

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Teddy1975
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Teddy1975

1996 850 - trip computer issue

Post by Teddy1975 » Sat May 14, 2016 3:28 pm

I replaced the timing belt along with rollers and water pump Friday, and when I started the engine everything seemed ok. Then, when I drove the car home from my parents I noticed the trip computer display was completely blank.

I know it worked before the TB job and I want to think that it is unrelated to that repair. The only thing I did that would/should have made any impact on the electrics was to disconnect the negative lead on the battery before I started working on the TB and reconnecting it after the job was done.

Another issue is the cabin light will just shut off upon closing the doors, instead of waiting for the ignition to be turned or 30 seconds delay as it used to do. The cabin light isn't a big deal, I just find it strange that these two faults occured right after swapping the TB. In my humble opinion none of these things should be related at all. Am I mistaken?

I glanced over the fuses and all of them seem fine. The gauges and mechanical odometer works, as does the backlight of the instrument panel, including that of the trip computer. The only outstanding issue in terms of electrical problems is a loud whine from the generator bearings, the generator output is fine though.

I really appreciate any and all help I can get.

Thanks,
Teddy
Current: 850 2.0L N/A, 4 door 1996 manual
Previous: 740 2.3L N/A, 5 door 1992 manual, and S70 2.5T 1999 manual

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erikv11
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erikv11

Re: 1996 850 - trip computer issue

Post by erikv11 » Sat May 14, 2016 4:56 pm

I agree, the symptoms are not likely related to the TB job.

I don;t have any great ideas on this one. Simply because the two electrical issues seem so unrelated, I would check the electrical portion of the ignition switch. Try jiggling the key, see if the trip computer will come back.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 285k
'06 S60 R, 165k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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BEJinFbk
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BEJinFbk

Re: 1996 850 - trip computer issue

Post by BEJinFbk » Sun May 15, 2016 12:35 am

You could have inadvertently shorted something
while working and blown a fuse - It happens...

If the ignition switch proves out as OK, it may
be worth taking a minute with a meter to check
all of the fuses in the box. It's quick and easy.

With the key on, run through the entire fuse box and check for
voltage at both ends of each fuse. Use the little metal nubs on top.

You'll probably run across a few with no voltage at either end
( some only see power when the accessory that they protect
is actually in use ) and that's OK. But if you hit a fuse that's
live at one end and has no voltage at the other, you've found
a blown fuse. Hopefully, just replacing it will fix you up.
'98 V70 R - Well Equipped for Life Up North... ;)

Teddy1975
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Year and Model: 850 1996
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Teddy1975

Re: 1996 850 - trip computer issue

Post by Teddy1975 » Sun May 15, 2016 9:04 am

I'll try testing the fuses and the ignition switch when the weather shows itself from a nicer side than today. It is more of a nuisance than anything else, I just prefer everything to be in working order. Maybe not mint condition, but at least working :)

Thanks for the ideas guys.
Current: 850 2.0L N/A, 4 door 1996 manual
Previous: 740 2.3L N/A, 5 door 1992 manual, and S70 2.5T 1999 manual

Teddy1975
Posts: 246
Joined: Wed Jan 06, 2016 11:57 am
Year and Model: 850 1996
Location: Denmark
Has thanked: 0
Been thanked: 7 times
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Teddy1975

Re: 1996 850 - trip computer issue

Post by Teddy1975 » Tue May 17, 2016 12:14 pm

All fuses checked out ok.

Figured I'd try to reset the computer and everything else by removing the negative lead and leaving it off for a few minutes. When I put it back and got behind the wheel to test, a solid 12:00 was present in the trip computer display and a short test drive later I can say that everything works as it is supposed to. :D
Current: 850 2.0L N/A, 4 door 1996 manual
Previous: 740 2.3L N/A, 5 door 1992 manual, and S70 2.5T 1999 manual

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Clemens
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Clemens

Re: 1996 850 - trip computer issue

Post by Clemens » Tue May 17, 2016 3:36 pm

That's great to hear. Good to know how helpful a reset can be.
Summer: 1996 855 R
Winter: 1994 855 T5M
Donor: 1995 854 10V

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