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Dave Nova
Dave Nova, Buick Technician
Category: Buick
Satisfied Customers: 1808
Experience:  ASE Master Certification. GM World Class Certification
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05 buick rendezouz 3.4 new starter new battery was running

Customer Question

05 buick rendezouz 3.4 new starter new battery was running fine 4 days ago now will not even crank
Submitted: 3 months ago.
Category: Buick
Customer: replied 3 months ago.
Sorry also checked the relays all are clicking
Expert:  david craig replied 3 months ago.

Hi Im David. first thing i need to know is if it will crank or start with being jumped?

Customer: replied 3 months ago.
No, will not crank at all
Expert:  david craig replied 3 months ago.

ok. new starter, new battery. so, we need to look at the connections at the starter. make sure they are clean of corrosion and not loose. same at the battery terminals and posts. then follow the main ground from the battery to where it attaches to the engine, make sure thats clean and tight.

Customer: replied 3 months ago.
Did all that
Expert:  david craig replied 3 months ago.

what about the ign1 fuse, the starter solenoid fuse, and the bat 1 fuse in the engine compartment fuse panel?

Customer: replied 3 months ago.
Checked all that all good
Expert:  david craig replied 3 months ago.

pull the starter relay out put a jumper wire in, key on, and see if it starts

Expert:  david craig replied 3 months ago.

it might be called a crank relay

Expert:  david craig replied 3 months ago.

here ya go

Customer: replied 3 months ago.
will try that
Customer: replied 3 months ago.
Can I let you know in about 30
Expert:  david craig replied 3 months ago.

absolutely im here with ya til we git er dun

Customer: replied 3 months ago.
Not sure where I am jumping from or to have crank relay off there are 4 prong where would I jump from and to
Expert:  david craig replied 3 months ago.

ok hold on....

Expert:  david craig replied 3 months ago.

you have a meter?

Customer: replied 3 months ago.
Volt meter??
Expert:  david craig replied 3 months ago.

yes

Customer: replied 3 months ago.
I do
Expert:  david craig replied 3 months ago.

pull the relay, check for 12 vdc in any of the slots. there should be 2 with voltage and 2 without....jump 12 volts to one of the ones with no voltage. if that doesnt work try the other one with no voltage...remember key on

Customer: replied 3 months ago.
Thank you will try
Customer: replied 3 months ago.
Still no crank
Expert:  david craig replied 3 months ago.

ok do you have voltage on any of the slots?

Customer: replied 3 months ago.
2 slots reading 12v 2 nothing ran jumper hot to not and still will not turn over
Expert:  david craig replied 3 months ago.

so 12volts isnt making it to the starter.

Customer: replied 3 months ago.
tracing the wires to see if break Crack etc
Expert:  david craig replied 3 months ago.

or to the pcm

Expert:  david craig replied 3 months ago.

well you can try putting the jumper in and checking at the starter for voltage first. i know you replaced the starter, but it wouldnt be the first time a new starter is bad.

Expert:  david craig replied 3 months ago.

then if thats good. we'll have to check about getting voltage to the pcm

Customer: replied 3 months ago.
Checking that now
Customer: replied 3 months ago.
Power to starter
Customer: replied 3 months ago.
How do i check pcm and where is it
Expert:  david craig replied 3 months ago.

power to starter? thats good. hang on a few. thank you.

Expert:  david craig replied 3 months ago.

there is a fuse that is labeled "inkey"the diagram shows it being in the center console fuse block.... that is power for the starter solenoid... can you check that first?

Customer: replied 3 months ago.
None are marked in key in book or panel
Expert:  david craig replied 3 months ago.

ok..let me look into that

Expert:  david craig replied 3 months ago.

have you checked this one?

Customer: replied 3 months ago.
That's where we looked and looking at manual nothing marked inkey
Expert:  david craig replied 3 months ago.

strange...ok

Expert:  david craig replied 3 months ago.

ok here is a pic of it, now i just have to figure out how to get to it

Expert:  david craig replied 3 months ago.

is this the same as the one on the side of the console?

Customer: replied 3 months ago.
That doesn't look like what I am looking at
Expert:  david craig replied 3 months ago.

yea actually its the back of that panel where all the wiring goes into it. so we will need to check the ecm for voltage.

Customer: replied 3 months ago.
Sorry to sound dumb but the fuse or the actual module
Expert:  david craig replied 3 months ago.

the actual ecm. its under the air filter box

Expert:  david craig replied 3 months ago.

but before that, try rapping on the starter while someone is trying to start it.

Customer: replied 3 months ago.
Will do
Expert:  david craig replied 3 months ago.

any luck?

Customer: replied 3 months ago.
Sorry had to go to work will be checking first thing this morning and let you know
Expert:  david craig replied 3 months ago.

ok thanks

Customer: replied 3 months ago.
Ok David have ecm accessible how do I test ecm
Expert:  david craig replied 3 months ago.

did you rap on the starter while trying to start?

Customer: replied 3 months ago.
I did power to starter
Expert:  david craig replied 3 months ago.

ok...gimme a sec

Expert:  david craig replied 3 months ago.

ok. here is a diagram with the crank signal to the pcm...

Expert:  david craig replied 3 months ago.

the yellow/black wire on connector c2 pin 76.... need to check for voltage there as someone tries to start

Expert:  david craig replied 3 months ago.

crank relay diagram is the first one i sent a couple days ago.... if there is no voltage then you might have to pull the relay panel if you cant see what position in the relay the yellow/black wire is so we can do a continuity test of that wire

Expert:  david craig replied 3 months ago.

any update?

Expert:  david craig replied 3 months ago.

do you still need assistance?

Expert:  kalamykid replied 3 months ago.

My name is ***** ***** I would like to see if I can help you with this problem. When you try to start the engine does the security light start flashing when you let go of the key and the switch is on the run position?