BCM?

[giant h2]

Battery has been good for months now! A few days ago the 2005 H2 (150000 miles) had a weird chime with no dash lights or alerts. Yesterday she started normally but when I shut her off the red battery light dash icon stayed on with the key off and out.

Also when I opened the door the radio stayed on and played delayed power didn't go out. It has never done that before? I had to shut the radio with the on/off vol. button (nav radio) it went off normally but I could hear a hiss noise like radio static? Key was out of ignition.

Later on I drove her and all was good but same happened at shut down. Battery symbol light on and radio played with key out and door open and hiss noise.

This morning the H2 was dead and needed a jump start. Any suggestions welcome?? Please help?

notes since last battery issue I disconnected the onstar with fuse removal and pulled out the nav disc.

[fyr145]

My guess is the alternator is not charging the battery. Test alternator for output amperage. Charge battery first.

[giant h2]

Originally Posted by fyr145

My guess is the alternator is not charging the battery. Test alternator for output amperage. Charge battery first.

it was tested with replaced (new) battery in January and was fine. Also it charges the battery after driving around for a bit.

[giant h2]

New Data: If I pull the SEO ACCY fuse with the Engine off key out (which has a wire from the back up cam wrapped around it) and re-seat the fuse the battery light icon on dash goes out, the PRNDL goes out and the radio goes off. Start the car and turn it off and all hell breaks loose again?

Thought it could be the ignition switch? So I wiggled the key and no joy. Interesting, if I touch the rear wiper sw or the windshield wiper sw with the door closed the battery icon goes out and the retained assy power plays the radio and dash cluster lights until door opens. If I have the door open and touch either wiper sw, all power goes off with key out. What does all this mean?

[HUMTECH]

Did you remove the back up cam wire or leave it in place when you reinstalled the fuse? If something is wrong with the camera it could power that circuit which is tied directly to the TBC ACCY fuse which in turn can be powering up the bcm

[HUMTECH]

If you did remove it and problem is still there. Remove rear wiper fuse and test system. If its still a problem remove ws wiper fuse and check it. Both those circuits run off the same power bus in the ip fuse panel so anyone of them could cause an electrical backfeed