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Ask tristan Your Own Question
tristan
tristan, ASE Certified Technician
Category: Buick
Satisfied Customers: 1608
Experience:  MASTER ASE CERTIFIED
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07 buick lucerne battery went dead put new battery in no

Customer Question

07 buick lucerne battery went dead put new battery in no crank no power on s wire at starter no door locks no remote information center says all the systems are off
Submitted: 1 year ago.
Category: Buick
Customer: replied 1 year ago.
WHY WON'T ANYONE ANSWER ME???
Customer: replied 1 year ago.
I ALREADY PAID YOU AND CAN'T GET AN ANSWER TO MY QUESTION THAT I PAID FOR???
Expert:  Mike S. replied 1 year ago.

Sorry you have had to wait so long.

Do you have a voltmeter or 12 volt test light in order to complete a few electrical tests?

Customer: replied 1 year ago.
Expert:  Mike S. replied 1 year ago.

If so, can you tell me if fuse #48/ ign switch has voltage? This fuse is in the rear fuse block, below the left rear seat. This fuse should be hot even with the key off.

Customer: replied 1 year ago.
48 is hot
Expert:  Mike S. replied 1 year ago.

If yes, then tell me if the fuse ecm ign 3 in the underhood fuse block has power with the key on run and start. This fuse block is forward of right front strut.

Expert:  Mike S. replied 1 year ago.

The "crank" fuse should also be hot even with the key off. This fuse is in that same fuse block underhood.

Expert:  Mike S. replied 1 year ago.

Also an "ecm crank fuse must be hot when the key is on start. same underhood fuse box.

Expert:  Mike S. replied 1 year ago.

Before I forget, here is the wiring diagram,

Customer: replied 1 year ago.
fuses ok
Expert:  Mike S. replied 1 year ago.

Remove the crank relay, test the prongs in the socket for voltage. One should be hot with the key off, turn the key to start and let me know if an additional prong in that socket now is hot.

Expert:  Mike S. replied 1 year ago.

That is the crank relay 3.

Customer: replied 1 year ago.
term 85
Expert:  Mike S. replied 1 year ago.

I don't know which is terminal 85, does 2 have voltage when the key is on start? If so, have you replaced that relay yet?

Expert:  Mike S. replied 1 year ago.

You know what, even before that. Let's check that other relay, too.

Expert:  Mike S. replied 1 year ago.

Even before that, put your finger on that crank relay 3 and feel if it clicks when the key is turned to start.

Expert:  Mike S. replied 1 year ago.

If it clicks, replace that relay. If it doesn't click, let's go and test that other crank relay, the run/crank relay 6.

Expert:  Mike S. replied 1 year ago.

Actually you already confirmed that "ecm ign 3" fuse had voltage with the key on start, didn't you?

Ok, then.

Then the problem could be with the signal from the park/neutral range switch at the transmission to the pcm.

Do you have a scan tool?

Expert:  Mike S. replied 1 year ago.

Make sure these grounds are tight, especially that G112.

Expert:  Mike S. replied 1 year ago.

That g112 is the ground for the park/neutral range switch as well as the maf, iat, ecm, eop, and both of those crank relays 3 and 6.

Expert:  Mike S. replied 1 year ago.

g112

Expert:  Mike S. replied 1 year ago.

I would suspect that g112 ground since you were having so many electrical outages, then work back from there or if it's ok, just go back to those other checks.

Customer: replied 1 year ago.
I have a scan tool.
Expert:  Mike S. replied 1 year ago.

Were there any codes? Does your scan tool retrieve codes from more than just the pcm?

Customer: replied 1 year ago.
U0140 LOST COMMUNICATION WITH BCM
Customer: replied 1 year ago.
ENGINE AND TRANS HAD SAME CODE
Expert:  Mike S. replied 1 year ago.

was g112 tight?

Customer: replied 1 year ago.
IS G112 BY THE STARTER?
Expert:  Mike S. replied 1 year ago.

I gave you a diagram showing you where it was, Bottom Left Side Of Engine.

Customer: replied 1 year ago.
THANKYOU GOODNITE BACK TOMORROW IM GOING HOME NOW ILL RATE U TOMORROW K?
Expert:  Mike S. replied 1 year ago.

k

Customer: replied 1 year ago.
GOOD MORNING IHAVE A DIFFERENT ENGINE INEED A DIFFERENT PICTURE OF ENGINE GROUNDS IT IS A 3.8 VIN CODE 2
Expert:  Mike S. replied 1 year ago.

That is for the vin 2, 3.8l engine. Maybe you are confused about when they said Bottom Left Side Of Engine. That would be the drivers side I believe.

Customer: replied 1 year ago.
PLEASE GIVE ME THE CORRECT ENGINE FOR G112 GROUND
Expert:  Mike S. replied 1 year ago.

I am sorry, but that is what the Mitchel manual has for that. If they are wrong, don't blame me.

Customer: replied 1 year ago.
ITS ALL GOOD ICLEANED ALL THE GROUNDS ON THE ENGINE WHATS NEXT?
Expert:  Mike S. replied 1 year ago.

go back to where I said "I don't know which is terminal 85, does 2 have voltage when the key is on start? If so, have you replaced that relay yet?" and start there.

Customer: replied 1 year ago.
I SWAPPED OUT OTHER SAME RELAYS WITH SAID RELAYS NO DIFFERENCE
Expert:  Mike S. replied 1 year ago.

That isn't the way I wanted to test.

If you want to do things that way, I won't be able to help.

If you want to actually do some testing, I can help.

Expert:  Mike S. replied 1 year ago.

You have a scan tool. What were the other 2 codes? You said lost communication with the engine. That isn't a valid code.

Customer: replied 1 year ago.
ENGINE U0140 WILLCOM TRANS U0140 WILL COM ABS TRACTION VSES U0140 BCM NO CODES NO COM AIR BAG U0140 DRIVER DOOR SWITCH B2555 PASS DOOR SWITCH B2555 ESC U0140 HVAC U0140 INSTRUMENT PANNEL U0140
Expert:  tristan replied 1 year ago.

I'll be able to walk you through the process to get your car running but you'll need a voltage meter a test light and a few small tools. Please accept the live phone call reguest to expedite the diagnostics. Thanks