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Lexus IS350 2015 F sport issue after dashboard removal


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Hi guys,

I'm having issues with my Lexus IS350 2015 F sport and I'm really stuck at this point, so the car had an issue with one of the flaps on the HVAC unit being faulty, so I made the decision to replace the whole unit, I disconnected the battery and started removing the dashboard and disconnecting everything, took out the entire dashboard bar and replaced the HVAC unit and proceeded to install everything back again, once everything was reconnected and reinstalled, I plug the battery and attempt to start the car but it only cranks and doesn't start up, I've triple checked all the wiring and connectors and everything is connected, I even went back and took the dashboard out again just to check if I've missed something but everything was connected. I did connect the scanner and the following codes were showing:

- U0327 - Software Incompatibility With Vehicle Security Control Module
- B2620 - ECU Power Source Circuit

Note: the car was running fine before the removal of the dashboard, and the timeframe of the whole process took around 2 - 3 days, so the car was left with battery unplugged over the course of 2 nights or so.

Any insight on helping rectify this issue would be greatly appreciated. Thanks.

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