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  #1  
Old 05-23-2006, 04:04 PM
AR AR is offline
 
Join Date: Nov 2005
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Default Lower brake lights out, fuses and bulbs are OK

As the title says, my brake lights are out, and the console is throwing the "Check brake light" error.

Bulbs have been replaced, mechanic said they were good, and old ones were definitely blown. Fuses are good -- replaced them anyway, still no go.

The brake light at the top center of the glass works great, just the lower taillights.

Any ideas of what to specifically look for? The mechanic is not Volvo-specific or trained, so he will not be working on the car.

Thanks!
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Old 05-23-2006, 04:10 PM
 
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Default RE: Lower brake lights out, fuses and bulbs are OK

You have replaced both the bulbs and the fuses? If it is still a "no go" I would have to assume that there may be something wrong with the wiring at this point. Bad ground perhaps? Maybe "tech" or someone else can shed a little more light on this subject.
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Old 05-23-2006, 04:31 PM
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Default RE: Lower brake lights out, fuses and bulbs are OK

Yes, both bulbs have been replaced with the appropriate OEMs, and the fuse looks fine (#3 in the trunk, 15 amp) but I replaced it anyway.

I'm hoping that this is something semi-common -- wires and harnesses/clips look fine as well -- nothing loose, crimped, or bare. I haven't had any other electrical issues with the car, and I've owned it for about 6 months.

Thanks again --
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Old 05-23-2006, 08:49 PM
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Default RE: Lower brake lights out, fuses and bulbs are OK

Does your Mechanic have a Scanner that can Read all the systems in the car?
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  #5  
Old 05-23-2006, 09:26 PM
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Default RE: Lower brake lights out, fuses and bulbs are OK

No, unfortunately this one doesn't. The dealership wil, but with the volume of the dealership in Austin -- it'll be a full day before they can take a look once I drop it off, and of course, there's probably a large service cost.

So yes, I am choosing to evade the direct fix (dealership) method right now, in hopes it can be fixed or diagnosed otherwise.
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Old 05-23-2006, 10:09 PM
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Default RE: Lower brake lights out, fuses and bulbs are OK

It is very hard to Fault trace them without the Computer hooked up.

That is because the Fuse Box in the trunk is actually a computer. The computer tells the lights to come on.

They are known to Mess up from time to time.

Is there anything else not working in the car? (Anything All info little or big will help)

Has anyone changed the Battery lately?
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Old 05-23-2006, 11:14 PM
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Default RE: Lower brake lights out, fuses and bulbs are OK

In reverse order:

Yes, I changed the battery 3 months ago with no issues. It was a volvo-approved replacement with no complications.

Everything else in the car is acting normal -- I need the front control arm bearing bushings replaced (.09 part, $500 labor, yay) and the no-neutral transmission software change, otherwise a-ok.

Not to distract you with a semi-unrelated question, but if the computer in back was telling the lights not to come on, would it still give me the Check Brake Light error? I guess I wouldn't expect a system of checks and balances like that -- one part says it's ok to be "off" and another part argues "no wait, that's wrong!".
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Old 05-23-2006, 11:25 PM
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Default RE: Lower brake lights out, fuses and bulbs are OK

The reason I asked because if one computer has a fault it can mess others up.
They are all on a Network.

Make sure no wires at the Battery Terminal broke off.
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1996 850 turbo
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Old 05-23-2006, 11:45 PM
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Default RE: Lower brake lights out, fuses and bulbs are OK

There are 3 wires on the battery, negative, positive, and a black wire on another screw on the positive connection. If I recall correctly, this goes to the computer/fuse box in the back.

If this is a computer issue, would disconnecting the battery neg, and resetting the ECU help? Maybe indirectly or temporarily?


Also, are there any wire harnesses or clips that connect both brake light terminals? There are three on the left side of the car and two on the right -- none seem interconnected. Bulbs or fuses bad, or a loose wire -- that's my fault. I'm trying to identify things I may have broken.
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Old 05-24-2006, 08:14 PM
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Default RE: Lower brake lights out, fuses and bulbs are OK

Not that I am aware of on the wires being connected.

Maybe the Battery disconnect might Help. Disconnect both terminals and hold them together for 5 minutes then connect.

After doing that make sure you also lock and unlock the car to wake the car up.
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1996 850 turbo
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Old 05-24-2006, 08:14 PM
 
 
 
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740, 87, brake, break, change, fuse, light, lights, message, s40, s60, s90, stop, volvo, working


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