Electrical and no start issues
Thread Starter
5th Gear
Joined: May 2010
Posts: 5
Likes: 0
Electrical and no start issues
Help please, I am working on a 98 automatic corvette. When the key is turned to the on position the interior lights flicker as well as the driving lights. You can hear the relays clicking as this is happening. The car will not start. When attempting to start it the starter will try and engage then disengage and it will do this over and over. I have pulled the relays and the car will still not start.
I have cleaned and checked all grounds. The starter has been replaced and all connections are tight. A new battery has been installed and also checked for tightness. The ignition switch has been cleaned not replaced.
Codes are PCM 1518h, c1526
TCS C1255H
BCM No comm
IPC u1064h,u1040h,u1176h
RDCM B2253h,b2255h,b2263h,b2283h,b2285h
LDCM B2282h, b2284h, u1064h
HVAC B0338hc
I have ordered a new ignition switch and any help in what to do next would be greatly appreciated
I have cleaned and checked all grounds. The starter has been replaced and all connections are tight. A new battery has been installed and also checked for tightness. The ignition switch has been cleaned not replaced.
Codes are PCM 1518h, c1526
TCS C1255H
BCM No comm
IPC u1064h,u1040h,u1176h
RDCM B2253h,b2255h,b2263h,b2283h,b2285h
LDCM B2282h, b2284h, u1064h
HVAC B0338hc
I have ordered a new ignition switch and any help in what to do next would be greatly appreciated
Thread Starter
5th Gear
Joined: May 2010
Posts: 5
Likes: 0
Ok now I have replaced the ignition switch and the tdr relay. I am still having the same issues with the driving lights and interior lights flickering. The car will start if i bypass the tdr relay. It also gives all the warning lights such as reduced power,service engine and several others.
Could this be the BCM. Any advice would sure help.
Could this be the BCM. Any advice would sure help.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
P1518 PCM to TAC Module Serial Data Circuit
P1626 Theft Deterrent System Fuel Enable Circuit
U1040 Loss of Communications with TCS
U1064 Loss of Communications with BCM
U1160 Loss of Communications with LDCM
U1176 Loss of Communications with RFA
U1056 Loss of Communications with RTD
With the two top codes, you've got problems there for sure. Since you replaced the ignition switch already and the TDR, something is still setting the fuel kill code which is why its not running yet not seeing the code for the key contacts. First things first, try examining the door accordian tube for a possible shorting wire there which takes out the serial data buss. Next, check the connectors to the SCM at the bottom of the driver's seat to the car interface for moisture. Next, look at the BCM itself for evidence of water on it or in it. Do not disconnect it without first removing battery power.
P1626 Theft Deterrent System Fuel Enable Circuit
U1040 Loss of Communications with TCS
U1064 Loss of Communications with BCM
U1160 Loss of Communications with LDCM
U1176 Loss of Communications with RFA
U1056 Loss of Communications with RTD
With the two top codes, you've got problems there for sure. Since you replaced the ignition switch already and the TDR, something is still setting the fuel kill code which is why its not running yet not seeing the code for the key contacts. First things first, try examining the door accordian tube for a possible shorting wire there which takes out the serial data buss. Next, check the connectors to the SCM at the bottom of the driver's seat to the car interface for moisture. Next, look at the BCM itself for evidence of water on it or in it. Do not disconnect it without first removing battery power.
Thread Starter
5th Gear
Joined: May 2010
Posts: 5
Likes: 0
Thanks for the info. I have checked and taped the wires in the door. I pulled out both seats, but only checked for a possible short in the wiring. What should I exactly look for I unplugged the serial bus with the four wires I think and it had no effect.
I was able to jump the TDR and get it to start today, but it will not start with the key. The interior lights still do not work as well as the trunk release. The DRL's will still flicker on occassion.
There is a possibilty the BCM did get wet. Can the BCM cause these issues. I also placed the wires from the serial data bus that go to the pcm, bcm and ipc and it still would not turn over with the key.
Again thanks for the help.
I was able to jump the TDR and get it to start today, but it will not start with the key. The interior lights still do not work as well as the trunk release. The DRL's will still flicker on occassion.
There is a possibilty the BCM did get wet. Can the BCM cause these issues. I also placed the wires from the serial data bus that go to the pcm, bcm and ipc and it still would not turn over with the key.
Again thanks for the help.
Tech Contributor
Joined: Jan 2007
Posts: 19,456
Likes: 1,165
From: Dyer, IN
You must resolve communication with the BCM before troubleshooting further...if not, you'll just continue chasing your tail.
The P1518 is also consistent with a low battery/voltage problem, and does not always mean there is a problem with the TAC.
I would stop jumping around, and go through the schematics to make a list of knowns i.e. voltage in/out of the ignition relay, voltage at the tdr, etc.....battery cable condition(no corrosion) and security are paramont. If you know that all the systems have the correct voltage, then I would inspect PCM connectors for corrosion, and inspect G106.
Again, BCM communication must be resolved first before moving forward.
http://forums.corvetteforum.com/c5-t...e-grounds.html
Last edited by lucky131969; May 30, 2010 at 04:59 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
5th Gear
Joined: May 2010
Posts: 5
Likes: 0
I did perform the manual relearn after installing the switch, but still no start using the key.
I checked voltage at the tdr and am getting around 12.2 volt to the red wire and the same to the yellow when the ignition is turned on, Don't know how to check for the signaled ground provided by the bcm to the yellow/black wire. The tdr even though it is new does not engage when the key is turned so I am not sure it is getting ground signal.
Pulled out pcm and checked for corrosion and it looked ok.
The problem started when he was driving it during a wet day and tuned it off and it would not start. The car ran great prior to this.
I was advised if I took the wires from the pcm,bcm and ipc if taken out of the serial connector and attached to each other would elimate all other areas except for those three. I did this and it made no difference.
The BCM is getting power. I checked and there was moisture around the fuse box and the bcm when it quick working.
If the bcm is bad will it still communicate with the other modules?
Hope this helps with providing a direction.
Thanks for the help.
I checked voltage at the tdr and am getting around 12.2 volt to the red wire and the same to the yellow when the ignition is turned on, Don't know how to check for the signaled ground provided by the bcm to the yellow/black wire. The tdr even though it is new does not engage when the key is turned so I am not sure it is getting ground signal.
Pulled out pcm and checked for corrosion and it looked ok.
The problem started when he was driving it during a wet day and tuned it off and it would not start. The car ran great prior to this.
I was advised if I took the wires from the pcm,bcm and ipc if taken out of the serial connector and attached to each other would elimate all other areas except for those three. I did this and it made no difference.
The BCM is getting power. I checked and there was moisture around the fuse box and the bcm when it quick working.
If the bcm is bad will it still communicate with the other modules?
Hope this helps with providing a direction.
Thanks for the help.
Tech Contributor
Joined: Jan 2007
Posts: 19,456
Likes: 1,165
From: Dyer, IN
I did perform the manual relearn after installing the switch, but still no start using the key.
I checked voltage at the tdr and am getting around 12.2 volt to the red wire and the same to the yellow when the ignition is turned on, Don't know how to check for the signaled ground provided by the bcm to the yellow/black wire. The tdr even though it is new does not engage when the key is turned so I am not sure it is getting ground signal.
Pulled out pcm and checked for corrosion and it looked ok.
The problem started when he was driving it during a wet day and tuned it off and it would not start. The car ran great prior to this.
I was advised if I took the wires from the pcm,bcm and ipc if taken out of the serial connector and attached to each other would elimate all other areas except for those three. I did this and it made no difference.
The BCM is getting power. I checked and there was moisture around the fuse box and the bcm when it quick working.
If the bcm is bad will it still communicate with the other modules?
Hope this helps with providing a direction.
Thanks for the help.
I checked voltage at the tdr and am getting around 12.2 volt to the red wire and the same to the yellow when the ignition is turned on, Don't know how to check for the signaled ground provided by the bcm to the yellow/black wire. The tdr even though it is new does not engage when the key is turned so I am not sure it is getting ground signal.
Pulled out pcm and checked for corrosion and it looked ok.
The problem started when he was driving it during a wet day and tuned it off and it would not start. The car ran great prior to this.
I was advised if I took the wires from the pcm,bcm and ipc if taken out of the serial connector and attached to each other would elimate all other areas except for those three. I did this and it made no difference.
The BCM is getting power. I checked and there was moisture around the fuse box and the bcm when it quick working.
If the bcm is bad will it still communicate with the other modules?
Hope this helps with providing a direction.
Thanks for the help.
Since moisture was discovered around that area, you might as well open up the BCM to check for moisture. If there is moisture present, you might get away with electrical contact cleaner, or a suitable electrical cleaner that will displace moisture, and evaporate with no residue. All this must be done with the BCM disconnected.
Most likely, the BCM is not sensing the key, or it's resistance value, and subsequently, is not communicating with the PCM to enable the fuel injectors, or allowing the engine to crank.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
I agree. At this point its prudent to extract and open the BCM, then start the careful cleaning process on both sides of the circuit board. The cause of the water is most likely the udders in the HVAC system being plugged which will need to be cleaned out otherwise this will happen again. If the BCM got trashed, buying a new one will be needed and usually a dealer to program the security and the RPO codes using a Tech 2. Yes, you can do a security relearn which will get a new one to communicate with the PCM and allow the car to start.