# Disabling custom alarm on 1997 Mercedes-Benz S-Class

**URL:** <https://community.cartalk.com/t/disabling-custom-alarm-on-1997-mercedes-benz-s-class/120994>\
**Category:** Maintenance/Repairs\
**Tags:** mercedes-benz, s-class\
**Created:** [July 14, 2018, 6:54am UTC](https://community.cartalk.com/t/disabling-custom-alarm-on-1997-mercedes-benz-s-class/120994 "2018-07-14T06:54:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![SimonThomas](https://avatars.discourse-cdn.com/v4/letter/s/edb3f5/32.png) [@SimonThomas](https://community.cartalk.com/u/SimonThomas)\
**Post date:** [July 14, 2018, 6:54am UTC](https://community.cartalk.com/t/disabling-custom-alarm-on-1997-mercedes-benz-s-class/120994/1 "2018-07-14T06:54:41Z")

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How to Disable a custom alarm on Benz S420

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**Author:** ![oldtimer-11](https://avatars.discourse-cdn.com/v4/letter/o/e79b87/32.png) [@oldtimer-11](https://community.cartalk.com/u/oldtimer-11)\
**Post date:** [July 14, 2018, 8:26pm UTC](https://community.cartalk.com/t/disabling-custom-alarm-on-1997-mercedes-benz-s-class/120994/2 "2018-07-14T20:26:03Z")

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If it is a custom alarm how is anyone else going to know how to disable it other than whoever made it?

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**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:** [July 14, 2018, 9:30pm UTC](https://community.cartalk.com/t/disabling-custom-alarm-on-1997-mercedes-benz-s-class/120994/3 "2018-07-14T21:30:18Z")

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It usually takes about 30 minutes to remove an aftermarket alarm and restore the vehicles wiring so it will start. Take the car to an audio/alarm shop and have it removed.