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volvo: 70 Brake lights out, bulbs & fuse good..Maybe a relay

Answered by:volvoexpert1
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It appears that the second option might be the cause, but I could not contact...

Customer Question

Volva S-70 Brake lights out, bulbs & fuse good. Any ideas? Maybe a relay, if so anyone know how to replace

Country: United States
Make: Volvo
Model: S_70
Year: 1998

Already Tried:
Both brake lights out (third brake light in back window working). Bulbs and fuse were good but replaced anyways and still lights not working.

Submitted: 338 days and 3 hours ago.

Category: Volvo

Value: $27

Status: CLOSED

Expert: volvoexpert1 replied 338 days and 2 hours ago.

volvoexpert1 : If you are sure the bulbs are good, the problem is evidently with the bulb failure sensor module in the trunk.

volvoexpert1 : Since the 3rd light works, the input is proven ok to the sensor. But the outputs to the bulbs has failed. The sensor is a blue rectangular unit hidden in the back of the spare tire compartment, probable in the left rear corner unde a Floor brace.

Customer :

Took everything out of spare tire compartment and there is no electrical unit of any type that I can find. Please advise?

volvoexpert1 : My memory is a little fuzzy but I know it's back there. It may be in the left rear corner under the taillight, behind the side trip panel under the frame rail brace. You may have to take loose the left trim panel and reach under the brace to find it. It is a light blue box about the size of a pack of cigarettes with several wires in it's connector at the bottom.

Customer :

I will go look in this location.

Customer :

Found a box in this location, although it is white (like the case of a computer white) not LT blue. Seems to be what your were directing me to. Now do I need to replace this module or is there a test to see if it is the problem?

Customer :

Also is "bulb failure sensor module" the actual name of this component? Trying to look up at parts store and getting "no part found" replys.

volvoexpert1 : Yes that must be it. You won't find it in a parts stor, it will have to come from the dealer , or one of the Volvo specialty vendors online, like IPD or FCP Groton. To test, unplug the unit. With the brakes applied, jump inuput 12(yellow) to 14(yellow/gray) for left stop light. 12 to 13(yellow/brown) for right.

Expert: volvoexpert1 replied 336 days and 20 hours ago.

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