Lost all communication help!
Tech Contributor
Joined: Dec 1999
Posts: 32,910
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
OK
All is NOT lost. There are TWO things that can cause NO COMMS. A shorted or damaged comms wire OR loss of power to the module. Most likely the BCM.
Your going to need that meter. There are TWO or more 12 VDC power supplies to the BCm and PCM. One is connected to battey feed and is HOT at ALL TIMES. The other is switched power from the ignition switch and is HOT in RUN and STATRT. I bet you missing the 12 VDC from the ignition feed.
Check all the BCm and PCM fuses. There are many.
Bill
All is NOT lost. There are TWO things that can cause NO COMMS. A shorted or damaged comms wire OR loss of power to the module. Most likely the BCM.
Your going to need that meter. There are TWO or more 12 VDC power supplies to the BCm and PCM. One is connected to battey feed and is HOT at ALL TIMES. The other is switched power from the ignition switch and is HOT in RUN and STATRT. I bet you missing the 12 VDC from the ignition feed.
Check all the BCm and PCM fuses. There are many.
Bill
Pro
Joined: Feb 2002
Posts: 568
Likes: 4
From: Central OH
My car(2004) is doing the same thing. It started after sitting all winter, here is the thread I started, you can take a look, but not sure if it will be any help.
http://forums.corvetteforum.com/c5-g...possessed.html
http://forums.corvetteforum.com/c5-g...possessed.html
Thread Starter
Former Vendor
Joined: Oct 2006
Posts: 7,331
Likes: 61
From: Port Huron MI
OKAY! HOLD ON!
I was just making a video to show you guys how the car was acting. At the end I went to show what it does when I crank the engine and holy **** it fired and ran! The engine runs now with M and B jumped, but I still have no communication ANYWHERE....
I was just making a video to show you guys how the car was acting. At the end I went to show what it does when I crank the engine and holy **** it fired and ran! The engine runs now with M and B jumped, but I still have no communication ANYWHERE....
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Thread Starter
Former Vendor
Joined: Oct 2006
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From: Port Huron MI
Every fuse was checked last night and all are well. Except #1 was blown, I got all excited to find it was my cigarette lighter that never worked... makes sense, didn't fix my issue, lmao
Tech Contributor
Joined: Jan 2007
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From: Dyer, IN
Cool. Now jump M, B, and G together. See if the car runs, and check for communication again.
Thread Starter
Former Vendor
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From: Port Huron MI
Tech Contributor
Joined: Jan 2007
Posts: 19,454
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From: Dyer, IN
Thread Starter
Former Vendor
Joined: Oct 2006
Posts: 7,331
Likes: 61
From: Port Huron MI
Tech Contributor
Joined: Jan 2007
Posts: 19,454
Likes: 1,163
From: Dyer, IN
Thread Starter
Former Vendor
Joined: Oct 2006
Posts: 7,331
Likes: 61
From: Port Huron MI
Ok, well jumping them this time gained communication with the BCM!
I get 1 code from the PCM: P1626 H
I get 4 codes from the BCM: B0605 H, B2587 H, B2592 H, U1255 HC
No codes from the IPC
Everything else No Comm.
THis is with light green, dark green, grey jumped
I get 1 code from the PCM: P1626 H
I get 4 codes from the BCM: B0605 H, B2587 H, B2592 H, U1255 HC
No codes from the IPC
Everything else No Comm.
THis is with light green, dark green, grey jumped