Service Battery Charging System
Thread Starter
5th Gear
Joined: Jul 2018
Posts: 5
Likes: 0
From: Michigan
Service Battery Charging System
Looking for some advice related to DIC notification.
current issue, car will sit in storage for maybe a week or two tops. Car starts without issue, drive maybe 3-4 miles and I get a notification the that the battery charging system is active, from there, maybe 30-40 seconds, I now receive a notification that the Battery charging system requires service. Then all hell breaks loose. Windshield wipers turn on, high berms turn on. DIC is flashing every service message possible. Then DIC goes dark, stereo display goes dark, power steering loss, then car dies.
jump start it, get in and go, car dies less than a half mile from previous location.
Finally got her home and called Chevy roadside assistance. Towed to dealer, they charged the battery and said I was good to go.
Drove home without issue from dealer. Next day, same issue, except I was close enough to a different Chevy dealer, pulled into service and waited for their diagnosis, battery replacement. Done, drive home from dealer with new battery, no issue.
drive the car later that evening, died again, new battery was not the fix. Currently back at dealer.
any thoughts out there, anyone experience the same? Has to me either alternator or PCM.
current issue, car will sit in storage for maybe a week or two tops. Car starts without issue, drive maybe 3-4 miles and I get a notification the that the battery charging system is active, from there, maybe 30-40 seconds, I now receive a notification that the Battery charging system requires service. Then all hell breaks loose. Windshield wipers turn on, high berms turn on. DIC is flashing every service message possible. Then DIC goes dark, stereo display goes dark, power steering loss, then car dies.
jump start it, get in and go, car dies less than a half mile from previous location.
Finally got her home and called Chevy roadside assistance. Towed to dealer, they charged the battery and said I was good to go.
Drove home without issue from dealer. Next day, same issue, except I was close enough to a different Chevy dealer, pulled into service and waited for their diagnosis, battery replacement. Done, drive home from dealer with new battery, no issue.
drive the car later that evening, died again, new battery was not the fix. Currently back at dealer.
any thoughts out there, anyone experience the same? Has to me either alternator or PCM.
Thread Starter
5th Gear
Joined: Jul 2018
Posts: 5
Likes: 0
From: Michigan
Tech Contributor
Joined: Oct 1999
Posts: 41,058
Likes: 9,820
From: Charlotte, NC (formerly Endicott, NY)
There is a small gauge battery current sensor wire that runs parallel with the battery ground cable. It is very tight and easy to break if the battery is changed or somebody pulls the ground cable off the battery. If it is broken/disconnected the system doesn't like it. Make sure that wire isn't broken. When I took delivery of my car that message was coming and going continuously for the 3 hour trip home. The next day I took it to the dealer that services my car and the Corvette mechanic spent a couple of hours trying to figure out what was wrong finally finding this wire had been broken while the car was in the previous dealers hands.
The wire is part of a 3 wire input to a hall effect sensor module (K18). The BCM provides +5V and ground to the module and the module monitors current direction into or out of the battery by using the wire connected directly to the battery ground cable. The module then sends a pulse width modulated signal back to the BCM telling it which way current is flowing and how much current is flowing (like the old ammeters that were on Corvette dash boards instead of voltmeters up until the mid to late 70s) If that circuit fails or that wire is broken the system disables regulated voltage control. The module can be damaged by over charging the battery with a battery charger or by jump starting the car.
Bill
The wire is part of a 3 wire input to a hall effect sensor module (K18). The BCM provides +5V and ground to the module and the module monitors current direction into or out of the battery by using the wire connected directly to the battery ground cable. The module then sends a pulse width modulated signal back to the BCM telling it which way current is flowing and how much current is flowing (like the old ammeters that were on Corvette dash boards instead of voltmeters up until the mid to late 70s) If that circuit fails or that wire is broken the system disables regulated voltage control. The module can be damaged by over charging the battery with a battery charger or by jump starting the car.
Bill
