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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

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  Jim Grant's Tech Tips

'02 Oldsmobile Alero, Brake Light Failure

Q: I own a ‘02 Oldsmobile Alero and the brake lights don't work, although the third light in the trunk deck does. The fuse and bulbs are fine. Could this be caused by the brake switch or does it sound more like the multi function switch?

A: The brake light switch on your vehicle sends power to the third/high mount brake light and branches off to power both brake light assemblies. The brake light circuit also sends a signal to the cruise control, anti-lock brake and vehicle computer systems. If all bulbs are good, I would suggest checking for electrical power to the brake light assemblies at the rear of the vehicle. You’ll find a 4 wire connector going to each rear light assembly. The wire for the brake lights will be a light blue wire, which will be found in both connectors. Don’t confuse this with the light blue wire with a black tracer on the left side or the dark blue on the right side light assembly; these wires are for the turn signals. If you don’t have power at these points then follow the wiring harness back and be on the look-out for damage or a connector that has a wire pulling out of it.

 
     
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