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Brake Lights Out .... Replace the relay? 2003 Cadillar CTS

3K views 3 replies 2 participants last post by  tarmacjerry 
#1 ·
None of my brake lights are working. I looked around online and found a few likely causes: BAS relay, brake light relay, brake light switch.

Where are each of these located? What are each designed to do?

What does BAS relay stand for?

Whats the difference between the brake light switch and brake light relay?

How do I change each?

Thanks in advance. Long Live Cadillac!
 
#2 ·
when you tap the brake pedal with it in park, do you hear a click?
 
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