What does this module do?

[Maxim]

Hello,

Not had my Alphard long (a couple of weeks). Bought privately so sold as seen.

Within a few days I got warning lights on the dash. All four of VSC engine TRC 4wd.

 

Based on other threads here I purchased the basic Toyota specific icarsoft code reader, and can reset the codes. If reset with engine running I can drive the car for hours without them coming back on, but pretty much as soon as I perform another start event, they come back on. Sometimes one light, sometimes all four, sometimes any two or three.

 

The codes I get are U0129 C1280 C1201

 

The previous owner fitted a new battery recently, but based on threads here, I think it is below spec, and there is some spliced wiring into the module in the pictures which I think is the real problem.

 

Does anyone know what that module in the photos is please?

And can anyone comment on whether I should try a beefier battery before I investigate wiring connections?

 

Photos of module and battery attached.

Edited January 26 by Maxim

[Maxim]

 

Edited January 26 by Maxim
Protect vehicle security

[Picasso]

Hello max before you start messing with things I say this fault was known by the person you bought it off you say new battery been fitted the battery is a cheap lion battery supplied by Europe car parts they are cheap basic batteries . It’s illegal to sell any car sold as seen you got rights I personally get the person who you bought off to put things right or get your money back citizens advice will tell you your rights 

[Maxim]

Thanks Picasso. Took your advice re battery and have replaced with a Bosch one.

 

I've also edited the original post to remove security details, having thought about it some more overnight.

 

Battery has fixed the problem but long term I will have the aftermarket wiring removed by an auto electrician.

 

The module in question I believe is the SMART key control module. Will link resources which helped me below in case help anyone else in future.

 

https://youtu.be/_5ochcNkM88?si=eGyM5wPJZMOJllm0

 

https://youtu.be/vYtU5-OLv-k?si=mvm3BnKRLgz1Xfyc

 

 

 

 

Edited January 26 by Maxim