Hi

I have a 2012 Alphard 2.4 that has a serious problem.

It has a problem with:

1. No power steering

2. No heating cooling

3. No indicators

4. No VSC

5. Airbag light showing

6. No outside temp

7. Changing auto box settings a bit difficult

The car starts ok and can be driven but difficult with no power steering or indicators!!!

I had been told it might be the main fuse link unit in front fusebox. Ordered one from Japan.

Fitted it ( awful Job) put back together and still have the same problems.

Anyone say idea what is causing this as it's driving me mad!!

Many thanks

Welcome im sure someone will be along soon with a bit more experience in this in the meantime could you supply me a vin . No I have access to look up system just want to check something

If it were my 2005 model I would go through each fuse with a circuit tester to find any non-functional fuses - bit of a pain I know but this sounds like more than one fuse gone.

Looking at my fuse boards I have one mention of VSC in the main engine board:

And one in the passenger-side fuse board:

Hopefully you have a JOBD reader - does it give any error codes?

I hope this helps.

Gamith has covered what I'd do. First give it an OBD scan and note fault codes. It is likely to be screaming lots of codes as so much isn't working. Any OBD tool should be able to read the codes, it doesn't need to be fancy.

Then, based on any clues given by the scan, work through the fuseboxes checking all the fuses. Also look for any signs of corrosion.

Next, pull the relays and check they operate correctly when 12v is applied to the coil: you can find out the coil with a multimeter because it typically is a pair of pins with a resistance of tens or hundreds of ohms, while the contacts read as either 0 ohms or off the scale.

Also don't forget grounding. The fuses control power flow from the positive side of the battery, but the negative side of all your auxiliaries are all connected together, often via the chassis. If lots of auxiliaries share a ground then a bad or corroded connection can affect them all. It's worth taking a thorough look for anything that might be corrosion near wiring.

I don't have a wiring diagram for the non hybrid, but perhaps someone has one?

Hi

My neighbour ex Royal Navy Electrical Engineer volunteered to have a look at it whilst I went on holiday and found a fuse had blown in the small fuse box by the steering wheel under the dash..replaced and hey presto all working again!! I have looked at all sorts of issues but now has full power steering and all issues resolved.

Thanks for you comments.

I am one happy chappy

There are fuses that are supposed to light up to indicate that they are blown. (aliexpress for example) which look to be worth a try as it might make this sort of thing a lot easier to diagnose and fix.