Buick Repair Questions? Ask a Mechanic for Answers ASAP
Hi, I am Mike, welcome. I'm reviewing your question.
It should. What are you trying to do?
Can I assume the starter doesn't crank over?
Check the "starter" fuse in the underhood junction block.
You had the voltmeter on the ground side of the relay, that is testing for a voltage drop and 0 volts is actually a good reading.
What are you trying to do?
Here is the Starting Circuit,
Does the relay click when you turn the key to start?
I don't know why you say #85 fades to nothing cause the pin #86 isn't supposed to have voltage until the key is on start. Pin #85 would not have any voltage either with the key off.
If the relay clicks, then install a new relay and try it again.
I'm getting ready to quit for tonite very soon so if you would still want help with this tonite, you have to answer my questions.
I got about 3-4 more minutes.
Ok, jump the 2 wires at the neutral safety switch and try it again,.
Unhook the transmission mode switch and jump the gray/white wire to the black/white wire and if the starter works then you need a new mode switch.
Yes, jump the tranny mode switch. Goodnite...
Did the starter crank with the tranny switch jumpered?
I cannot sit here and stare at the screen all day long. If you cannot give me a ballpark time when you might be testing it, then I might as well opt out.
The thing is, I am done. That was the last test. If jumping the switch works, replace the switch. I would rather you just rate me now cause I am going on vacation now.
This post is going to time out tomorrow at 9:02pm.
I had already opted out because when you said it would be more than a week before you could get to the vehicle, after the already 7 days since this post was opened I felt it was not soon enough for me to continue, then I got an email from justanswer saying I was rude to you. I don't recall being rude but in case it appeared that I was I apologize.
I did respond to your mention of that pin #85 dropping to zero volts and I asked you dropping from what because there isn't supposed to be 12 volts on that circuit unless the key is turned to start. Nonetheless, I had narrowed it down to possibly the transaxle mode switch, then you came back saying it don't exist. If you would have looked at that wiring diagram more closely you would have noticed it said, "internal mode switch" and this is the explanation from the repair manual,"The Internal Mode Switch (IMS) is a sliding contact switch attached to the selector detent inside transaxle side cover. See Figure . The IMS replaces the Park/Neutral Position (PNP) switch, which is used on all other models. IMS communicates switch position information to PCM, that is used for engine controls and for determining transaxle shift patterns."
Here it is #9 In this diagram.