# sync 1 to 3 conversion **URL:** \ **Category:** SYNC 3 Support\ **Tags:** retrofit, SYNC1, pre-my20, nav, SYNC3, APIM, na\ **Created:** [21 June 2024 11:48 UTC](https://community.cyanlabs.net/t/sync-1-to-3-conversion/14285 "2024-06-21T11:48:22Z")\ **Posts on this page:** 7\ **Page:** 2
**Author:** ![SFRANCO](https://community.cyanlabs.net/user_avatar/community.cyanlabs.net/sfranco/32/11005_2.png) [@SFRANCO](https://community.cyanlabs.net/u/SFRANCO)\ **Post date:** [22 June 2024 15:52 UTC](https://community.cyanlabs.net/t/sync-1-to-3-conversion/14285/21 "2024-06-22T15:52:26Z")
thanks bill ---
**Author:** ![SFRANCO](https://community.cyanlabs.net/user_avatar/community.cyanlabs.net/sfranco/32/11005_2.png) [@SFRANCO](https://community.cyanlabs.net/u/SFRANCO)\ **Post date:** [22 June 2024 15:54 UTC](https://community.cyanlabs.net/t/sync-1-to-3-conversion/14285/22 "2024-06-22T15:54:36Z")
![xxxxxxxxxxx](https://community.cyanlabs.net/uploads/default/original/2X/6/682f8abfe7b28107e2ef4e45d15b7236e8eadfdd.jpeg) ---
**Author:** ![bill32399](https://community.cyanlabs.net/user_avatar/community.cyanlabs.net/bill32399/32/2724_2.png) [@bill32399](https://community.cyanlabs.net/u/bill32399)\ **Post date:** [22 June 2024 15:58 UTC](https://community.cyanlabs.net/t/sync-1-to-3-conversion/14285/23 "2024-06-22T15:58:54Z")
Do you have an IPMB? Do you have either the 360 cameras or Backup assist? If not this should not be turned on as you would not have that module. I don’t think it is the LIN circuit as that goes to the BCM not the APIM. Honestly, I think it is the wire harness. If it were me, I would trace the pins and check for continuality just to rule it out. ![image](https://community.cyanlabs.net/uploads/default/original/2X/9/97944315286a3baa7b893248796d6eb5f57c9f0b.png) ---
**Author:** ![SFRANCO](https://community.cyanlabs.net/user_avatar/community.cyanlabs.net/sfranco/32/11005_2.png) [@SFRANCO](https://community.cyanlabs.net/u/SFRANCO)\ **Post date:** [22 June 2024 16:59 UTC](https://community.cyanlabs.net/t/sync-1-to-3-conversion/14285/24 "2024-06-22T16:59:09Z")
No backup assist or 360 cams ---
**Author:** ![bill32399](https://community.cyanlabs.net/user_avatar/community.cyanlabs.net/bill32399/32/2724_2.png) [@bill32399](https://community.cyanlabs.net/u/bill32399)\ **Post date:** [22 June 2024 17:06 UTC](https://community.cyanlabs.net/t/sync-1-to-3-conversion/14285/25 "2024-06-22T17:06:17Z")
> [@SFRANCO](#): > > BdyCM config shows Rear Vehicle Camera Control in IPMB Unless you physically see this module behind your APIM than I would turn this off as you don’t have one. That can affect the video signal going to the APIM. ![image](https://community.cyanlabs.net/uploads/default/original/2X/5/5eecb3e4eb18c5444223d1a525b22488057144f6.jpeg) ---
**Author:** ![brettgriffin](https://community.cyanlabs.net/user_avatar/community.cyanlabs.net/brettgriffin/32/12408_2.png) [@brettgriffin](https://community.cyanlabs.net/u/brettgriffin)\ **Post date:** [24 June 2024 07:30 UTC](https://community.cyanlabs.net/t/sync-1-to-3-conversion/14285/26 "2024-06-24T07:30:30Z")
When I did my upgrade I had exactly the same issue. Turned out the RCA adapter on the conversion harness had loose connections. I ended up getting an adapter and bridged it between the harness and the APIM and used the RCA plug on it instead. Worked immediately [https://a.aliexpress.com/\_ms0zDt2](https://a.aliexpress.com/_ms0zDt2) ---
**Author:** ![system](https://community.cyanlabs.net/letter_avatar_proxy/v4/letter/s/bcef8e/32.png) [@system](https://community.cyanlabs.net/u/system)\ **Post date:** [24 July 2024 07:31 UTC](https://community.cyanlabs.net/t/sync-1-to-3-conversion/14285/27 "2024-07-24T07:31:03Z")
Closed on 24 July 2024 07:31 UTC This topic was automatically closed 30 days after the last reply. New replies are no longer allowed. [Previous page](https://community.cyanlabs.net/t/sync-1-to-3-conversion/14285.md?page=1)