C7 battery draining - infotainment/amp?

dangtfc

CCCUK Member
Back in Feb I went on holiday and forgot to leave C7 on trickle charge. Came home and with miserable weather didn't take it out. All told approx 4 weeks of standing still with no charging.

Went to start car and battery completely dead. Gave it a full recharge but it kept dropping charge, sometimes car wouldn't start within minutes of finishing a ride. Finally got round to testing battery health and found it was delivering 250 CCA or so. I noticed that when I was turning the car off and locking the door, after a few minutes I could hear a click/thump sound from inside the car, like an amp being turned on. This repeated every few seconds.

Stuck a brand new battery in, all ok but still getting the amp clicking. Pulled Fuse 21 to turn off touchscreen and amp and everything seems fine. I know there is a code DTC B1517 which would sometimes occur when the small black cable to the neutral terminal was damaged, but as far as I can tell my cable is ok. Could the complete battery discharge have caused some issue elsewhere that needs resetting?

Appreciate any guidance!

Additional info; Had the touchscreen on OEM head unit replaced (original part) approx 1 year ago. Had no issues at all until the battery drain event.
 

teamzr1

Supporting vendor
You need to say what year and model your C7 is
Common, you need to see what the code is after B1517 such as


Device Power 2 Circuit Voltage Below Threshold

DTC B1517 03
-
Battery Voltage Below Threshold
DTC B1517 07

-
Battery Voltage Above Threshold

DTC B1517 5A

Review



and

 
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