Buick Repair Questions? Ask a Mechanic for Answers ASAP
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Is the theft light on?Have you scanned the system to see if there are any fault codes setting?Is the battery fully charged and the connections clean and tight?
Okay if you take your 12 volt test light and or a volt meter and at the starter with the key in the crank position are you getting battery voltage on both wires at the starter?
Okay have a look at the enclosed wiring diagram and see if your getting the ground from the PCM (computer) at the starter relay while holding the key in the crank position.https://dl.dropboxusercontent.com/u/104923897/Start%20Sep%207.pdf
There are 4 oinns, two are power , one is the ground from the PCM and the 4th is power out to the starter. Do you have power in on the two power pins with the key on?
Okay if both pins have power and you have ground from the PCM the relay should click and energize, dose it click when cranking?
Okay if you are sure you have power in on both power wires and a good ground from the PCM and the relay dose not energize then that points towards a bad relay. Try swapping the relay out of a known good relay.
Okay then recheck for power on both power pins as well as a good ground from the PCM in the crank position and if all three are present you should have power out on the purple wire to the starter.
Okay which wire are you jumping?
If you sure the 40 amp starter solenoid fuse is okay then both pins at the relay should be hot. Did you not say they where?
Okay if both are hot and you have a good ground from the PCM at the relay then it should start. Which wires are you jumping?
If there hot as they should be why are you having to jump power to them?
Okay your supplying power to the relay from the two fuse that should be supplying power to it. If you remove your jumper do these two pins have power from the two fuse?
It will as long as you jumper is in place. Dose it run if you remove the jumper and install the relay?
This is a stater relay, of course it will stay running once it started, will it crank and start with the jumper removed?
Okay then are you sure you have power at both pins from the two fuse at the relay?
If you have power at both pins with the relay in place and a good ground at the relay from the PCM then it should crank and start. You missing something here.
Okay your missing something here, you need power to the two hot pins and a good ground from the PCM at the relay with it in place and if you have that the engine should crank. Which one are you lacking?
The PCM reads the keys and if the keys are read then the PCM will ground the relay and allow the engine to start.
Your data is showing the key is learned, have you tried a different key ?
I have to wonder if there is a problem with the key. If you can get a second key you can see if it will relearn the new key. If you can get a second key try the procedure below.
Okay, hopefully that will solve your problem.
See the wiring diagram in the link below.https://dl.dropboxusercontent.com/u/104923897/Teft%20deternent%20Sep%207.pdf
Well at this point Im not sure what more I can do from here. I can open the post back up for you if you would like and perhaps someone else has something different to add.
Doing so now