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Ask Roy Belding Your Own Question
Roy Belding
Roy Belding, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 4639
Experience:  Master ASE since 1980
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I think my NCM is bad. BCM, 04 GTP, yes, no

Customer Question

I think my NCM is bad. BCM
JA: What is the model/year of your Pontiac?
Customer: 04 GTP
JA: Are you fixing your GTP yourself? What have you tried so far?
Customer: yes
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 20 days ago.
Category: Pontiac
Customer: replied 20 days ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer: replied 20 days ago.
hello ?
Expert:  Roy Belding replied 20 days ago.

hello, my name is ***** ***** I will be glad to assist you. please allow me a couple of minutes to gather some basic info.

Roy

Expert:  Roy Belding replied 20 days ago.

ok, what is your question???

Roy

Customer: replied 20 days ago.
What will/ won't work when I change my BCM, be fore I get it to someone with a Tech2 ? 04 GTP
Expert:  Roy Belding replied 20 days ago.

all bodt functions run through the bcm

what is not working making you think it is bad???

Customer: replied 20 days ago.
Years ago I replaced the on star unit with a Costar Bluetooth unit. Months later occasionally the DIC freaks out & most of the gauges stop working. They come back after a while or after you park- leave the car & return. This is happening more often. Now occasionally after a few days, my battery would die ( not related I think)& after a restart the radio audio part of the nav, wouldn't work until I pulled it's fuse with the car running. Now the radio sound won't work till I pull the fuse every time I start the car. Then even it only has one set volume loudness or no sound.
Expert:  Roy Belding replied 20 days ago.

ok, first, you have a radio that has failed internally.

as far as the dash. make sure the connector at the back of the cluster is clean and tight. look for corroded, bent or damaged pins. if all is good, you have a failed cluster.

Roy

Customer: replied 20 days ago.
What cluster ?
Expert:  Roy Belding replied 20 days ago.

instrument panel cluster

Roy

Customer: replied 20 days ago.
I also have a Areoforce scan gauge the fails with the there things. The only thing that's common between all these problems is the BCM.
Customer: replied 20 days ago.
Also the radio comes on. It's the amp that stops working.
Expert:  Roy Belding replied 20 days ago.

ok, the bcm monitors these systems but does not control them

as far as the radio, that will have to checked to confirm the failure.

Roy

Customer: replied 20 days ago.
Ok so back to the original Q. What will/ won't work when I change my BCM, be fore I get it to someone with a Tech2 ? 04 GTP
Expert:  Roy Belding replied 20 days ago.

the bcm has to be flashed, did you realize that??? must be new, not used.

all gauges will work ac will not, windows will not work

Roy

Customer: replied 20 days ago.
Right, that's why I'm asking. Also I've read where many people have installed used BCMs.
Expert:  Roy Belding replied 20 days ago.

what you dont read is all the issues they have after installing them. it must be flashed to your vin number only. when re flashing a used unit, most of the time there is issues with the flashing actually working

Roy

Customer: replied 20 days ago.
ok So, what would cause / be the connection between the DIC & gauges to fail when I get a phone call & the Costar activates the phone function on the radio ?
Expert:  Roy Belding replied 20 days ago.

without me being there, I have no idea from here. I would need my scan tool and testing equipment to give you that answer.

Roy

Customer: replied 20 days ago.
Looking at the SM, it looks like Data Link comm.
Expert:  Roy Belding replied 20 days ago.

sm????

Customer: replied 20 days ago.
Service Manual. It has radio, BCM & IPC in it amongst other things. Recently I got a 062 DTC a
3 of times. But I don't see such a code anywhere. It goes away by it self. Ever heard of that one?
Expert:  Roy Belding replied 20 days ago.

nope, not listed at all

Customer: replied 20 days ago.
what do you know about Data Link comm. sys.
Expert:  Roy Belding replied 20 days ago.

do you understand about serial data lines where all the computers talk to each other

Customer: replied 20 days ago.
a little
Expert:  Roy Belding replied 20 days ago.

without good understanding this is the wrong forum to discuss it

Customer: replied 20 days ago.
That seems to be the common point with what's happening here. Would one of the other people here know about that?
Customer: replied 20 days ago.
Maybe put out this out for others to look at.
Customer: replied 19 days ago.
Hi Roy
Do you know about the class 2 data system & DTC's like U1000 & U 1255 ? If not isn't there someone here that does, Someone that knows the Teck2 ?

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