# Changed battery and alternator on a 2012 corolla s **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** corolla, toyota\ **Created:** [June 23, 2020, 9:16pm UTC](https://community.cartalk.com/t/changed-battery-and-alternator-on-a-2012-corolla-s/166250 "2020-06-23T21:16:30Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![Elvis-18](https://avatars.discourse-cdn.com/v4/letter/e/dfb087/32.png) [@Elvis-18](https://community.cartalk.com/u/Elvis-18)\ **Post date:** [June 23, 2020, 9:16pm UTC](https://community.cartalk.com/t/changed-battery-and-alternator-on-a-2012-corolla-s/166250/1 "2020-06-23T21:16:30Z")
Good evening, So recently my corrola had died. And whilst trying to jump it my bud had his wires crossed and my horn went off. After trying to jump it several other times I came to the conclusion that either the alternator or batter had gone bad. So I replaced both. Now the car turns on fine. But electronics wont work. On the dash the abs, air sensor light, airbag, steering, skid,and brake lights are on. Car wint shift into drive. Ac doesnt work. Only hazards work, not individual blinkers. Is this a ECU problem? I have one ordered and on the way, I’m just hoping I didnt waste money ![15929469531056300478211201326526](https://global.discourse-cdn.com/cartalk/original/3X/4/2/4210f338085946700373a378bf42fe5b469f3874.jpeg) ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [June 23, 2020, 9:20pm UTC](https://community.cartalk.com/t/changed-battery-and-alternator-on-a-2012-corolla-s/166250/2 "2020-06-23T21:20:36Z")
You may have fried the body control module. > **[5 Common Symptoms of a Failing Body Control Module (BCM) - Module Experts](https://moduleexperts.com/5-common-symptoms-failing-body-control-module-bcm/)** > > If your BCM malfunctions, you will notice a negative effect on the operation of your vehicle. Watch out for these symptoms. Tester ---
**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\ **Post date:** [June 23, 2020, 9:29pm UTC](https://community.cartalk.com/t/changed-battery-and-alternator-on-a-2012-corolla-s/166250/3 "2020-06-23T21:29:45Z")
You ARE wasting money by replacing parts without proper diagnosis first. It would cost you far less money to have a pro diagnose and repair this. ---
**Author:** ![Elvis-18](https://avatars.discourse-cdn.com/v4/letter/e/dfb087/32.png) [@Elvis-18](https://community.cartalk.com/u/Elvis-18)\ **Post date:** [June 23, 2020, 9:39pm UTC](https://community.cartalk.com/t/changed-battery-and-alternator-on-a-2012-corolla-s/166250/4 "2020-06-23T21:39:42Z")
I’m an e3 in the Navy, I learned once to start small and go from there. I got a code reader, and it wont even turn on ---
**Author:** ![Elvis-18](https://avatars.discourse-cdn.com/v4/letter/e/dfb087/32.png) [@Elvis-18](https://community.cartalk.com/u/Elvis-18)\ **Post date:** [June 23, 2020, 9:40pm UTC](https://community.cartalk.com/t/changed-battery-and-alternator-on-a-2012-corolla-s/166250/5 "2020-06-23T21:40:19Z")
Luckily I have a one on the way, that’s what I figured all along but I’m not a car guy ---
**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\ **Post date:** [June 23, 2020, 9:43pm UTC](https://community.cartalk.com/t/changed-battery-and-alternator-on-a-2012-corolla-s/166250/6 "2020-06-23T21:43:16Z")
You spent a good amount of money on a battery and an alternator without even putting a voltmeter on the old ones. To me, that doesn’t demonstrate good judgement. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [June 23, 2020, 9:48pm UTC](https://community.cartalk.com/t/changed-battery-and-alternator-on-a-2012-corolla-s/166250/7 "2020-06-23T21:48:05Z")
Connecting the cables backwards usually causes fuses to blow. Check all of the fuses in the engine room fuse block. There is also a large grid fuse under a clear plastic cover, inspect for any blown segments. ---
**Author:** ![Elvis-18](https://avatars.discourse-cdn.com/v4/letter/e/dfb087/32.png) [@Elvis-18](https://community.cartalk.com/u/Elvis-18)\ **Post date:** [June 23, 2020, 10:08pm UTC](https://community.cartalk.com/t/changed-battery-and-alternator-on-a-2012-corolla-s/166250/8 "2020-06-23T22:08:42Z")
Completed that ---
**Author:** ![Elvis-18](https://avatars.discourse-cdn.com/v4/letter/e/dfb087/32.png) [@Elvis-18](https://community.cartalk.com/u/Elvis-18)\ **Post date:** [June 23, 2020, 10:10pm UTC](https://community.cartalk.com/t/changed-battery-and-alternator-on-a-2012-corolla-s/166250/9 "2020-06-23T22:10:40Z")
Battery died twice before, wouldn’t start while jumped, or double wired to another car. Battery would hold the charge. Two faults that seem text book bad alternator for not being able to stay on after a jump, and bad battery for not being able to hold charge from a remote pack ---
**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\ **Post date:** [June 23, 2020, 10:37pm UTC](https://community.cartalk.com/t/changed-battery-and-alternator-on-a-2012-corolla-s/166250/10 "2020-06-23T22:37:22Z")
I’m getting off this thread now, before I get charged with “bad behaviour” ---
**Author:** ![Elvis-18](https://avatars.discourse-cdn.com/v4/letter/e/dfb087/32.png) [@Elvis-18](https://community.cartalk.com/u/Elvis-18)\ **Post date:** [June 23, 2020, 11:05pm UTC](https://community.cartalk.com/t/changed-battery-and-alternator-on-a-2012-corolla-s/166250/11 "2020-06-23T23:05:48Z")
Thank you for the assistance and input. That was very enlightening and comprehensive way to help me figure out what’s wrong, as a forum would. If there was a rating system, I’d give you a 10 ---
**Author:** ![JoeMario](https://avatars.discourse-cdn.com/v4/letter/j/3bc359/32.png) [@JoeMario](https://community.cartalk.com/u/JoeMario)\ **Post date:** [June 24, 2020, 1:18am UTC](https://community.cartalk.com/t/changed-battery-and-alternator-on-a-2012-corolla-s/166250/12 "2020-06-24T01:18:15Z")
> [@Elvis-18](#): > > Completed that Elvis-18: In addition to the fuses, did you find the heavy fuseable link? And did you verify that they not only look OK, but have continuity?