Buick Repair Questions? Ask a Mechanic for Answers ASAP
Ok, does the engine turn over, or no noise or just a click when key is in crank position?
Is the security/antitheft light on?
Ok, give me a couple of minutes to pull the schematics
Ok, there are several fuses in the engine compartment fuse box and a couple of relays you need to check - see attached
For the fuses, see if they are blown and for the relays, swap them with others in the box
Then there is one fuse in the fuse box located at the center console - see attached
If fuses and relays are good, you will need a voltmeter for some testing
They have a metal filament in them. For the 2 blade ones, you will pull the fuse out and look to see if the filament inside the plastic case is broken. For the square ones, you can look at the top of it to see the filament and see if it is broken or not
One more fuse to check - PT RLY 15mp fuse I have red arrow pointing to
Ok, do you have a voltmeter?
Ok, you need a voltmeter which is used for testing voltage at components, connectors and wiring. We need to see if there is 12v on the purple wire at the starter while the key is in the cranking position
You can get a cheap one for $20 at Walmart
Since fuses and relays are fine, there is no way to diagnose an electrical issue without a voltmeter