Question about error message,"Check Hybrid System"

reset by turning on and off your car 3x

 

Are you sure you seated the orange safety plug and locked it? That's a typical issue upon reinstall.

 

Most likely the high voltage interlock was not correctly installed. On G2 for example, after the lever is pivoted 90 degrees it must be slid to be locked in place.

 

Just to pile on: it's probably that orange plug on the hybrid battery.

I disconnect nothing before cleaning that fan, no problems.

Disconnecting the 12 volt in particular is a bit of a pain, if not warranted: you lose radio presets, trip meters, and maybe the window auto-up function needs re-learning.

Also, in my experience at least: a 12 volt disconnection causes the car to act a bit strange for the next drive or two, doing odd revving-up, as if it's recalibrating.

Sometimes you absolutely should disconnect 12 volt, but I don't think this is one of those cases.

 

Does the "ready" message display? How old is the 12v? Has it ever been discharged (light left on, door not closed, etc)?

 

Even though missing the last of three steps when replacing the orange plug is very common.
We will have to defer to your assessment that you, indeed did all three steps:
Step 1) Insert plug
Step 2) Swing handle upwards
Step 3) (often missed) SLIDE THE HANDLE VERTICALLY DOWNWARDS UNTIL YOU HERE IT CLICK.
Here is Carolyn's video showing the 3 step process.

Other things to check
Did you plug both of the fan harnesses back together?
1) Smaller Plug on the back of the fan itself.
2) Wider white plug to the upper right of the fan.

As a prank I've unplugged those before.
It disables the car. Heh.

Otherwise take a moment to scan the vehicle to obtain the error code.
It will tell you what is wrong... such as P0A0D - High Voltage System Interlock Circuit High.
(o.k., o.k. I won't mention that again)

 

yes, a bad 12v will prevent starting.