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Starting Problems On Avensis? Solution.


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This is a short workshop for changing the ignition switch on an Avensis 2.0 1999.

I've had problems with starting the engine since beginning of summer. The symptoms were like this;

when turning the key to the START position, nothing happens. You have to, either turn it from ON to START a few times or wiggle the key while holding it in the START position, to get connection in the lock to start the motor. :ffs: :help:

This is due to a faulty switch behind the locking barrel, that has been worn down so it does not alway connect. This has nothing to do with the imobilizer system or coding of keys, it is only a mechanical problem and will not be solved by re-coding the keys or such.


Be ware, the dealer gave me the wrong part on my first order;

I described the symptoms and where the part is located and they knew exactly what I needed, after a long search in their computer they came up with the part I nedded. It was not in stock so they ordered it.

What I got was a part called something like Coding Unit/Computer Unit remote control (PN 89780-05011).

It's a part in black plastic casing with the front ring around the keyhole (with the text ACC/ON/START) and a short cable with a connector. This is the receiver of the coded keys and it is the wrong part, also it's more expensive and doesn't solve this problem.

When I called them on the phone and described the symptoms again and told them I've got the wrong part, they looked again and came back to me saying that it was the correct part I've got. :angry:

After a little convincing that I had a mechanical problem and not a computer problem, he discussed with another guy and finally they found the correct part.


I've had a lot of help from member GnzYza in 'Problems with starting', where you can read how it all started.

Once again, thank GnzYza. :D

1. First you need to get the new part from a Toyota dealer.

The part you need is the SWITCH ASSY, partnumber 84450-02010 (at least for my Avensis -99, but it gives you something to start with at Toyota).



2. Disassembling.

You'll need a cross/pozidrive screwdrive of medium size, that's all you need.

(It might come in handy with some kind of light because it's rather dark behind the dashboard)

First remove the dash casing below the steering wheel, there are 2 black screws, one to the left...


...and one to the right and also the golden screw under the cowling.


Turn the steering wheel so you'll see the last 2 screws behing the wheel...

to the left...


...and to the right.


3. Carefully pull the dash casing a bit outwards in the bottom and slide it down to remove it. There are 3 things stuck to this part; the wire for the front hood, an airtube and a wire with connector on it. These can remain in place, just put the casing on the floor.


4. Separate the top and bottom parts of the cowling, there are only small plastic lockers holding them together now, so a little bending with a screwdriver in the joint between them would do it. The joint is on both the left and the right side, you'll see it clearly if you look close.

The top one could needs not to be removed, but the bottom one does. It might be easier if you loosen the locking handle for adjusting the height of the stearing wheel.

5. Now you should have access to everything under the cowling. Don't be alarmed, it is not so much you have to care about, it is just very much cabling in a very tight space.

Locate the rear of the ignition barrel, where you'll find following parts attached to it:


A and B are just connectors placed on the Switch Assy, remove them, but don't disconnect them.

C is the connector on the Switch Assy. Disconnect it and fold it away.

D is the actual Switch Assy. The arrow points to one of the two screws that holds it in place. (The easy one...)

6. Change the Switch Assy

Remove the two screws that holds the Switch Assy to the rear of the barrel. One is easy to get at, but the other one is rather tricky to access.

The screws might fall off so don't loose them!

Once they are removed, pull the case of the Switch Assy away from the barrel. You can't pull it off all the way, so you'll have to turn it 45 degrees and try to get it out sideways. There are no loose parts there so you are rather free to remove it any way you can. Just keep in mind how you did it since you have to get the new part in, the same way.

7. Assembling.

Place the screw that was hard to get at, in it's hole on the new Switch Assy before placing it in position. It is very hard to get it in place through all cables.

Now, just tighten the screws for the Switch Assy, re-connect the cable (is only one way), fit the two connectors you removed in the beginning, and you're finshed with the hard part.

Fit the bottom part of the cowling again, remember to have all plastic notches in their place. The parts will lock together nicely, fit the 2 screws behind the steering wheel again and also the bottom one.

Place the dash casing in it's place; top first them push in the bottom. Screw it tight in place.

8. Finished.

This is not a hard work and it took me around 25 minutes (including taking the photos). After that my car has started without a problem.

The Switch Assy costed 900 SEK (> £60) but the garage told me they would charge me around 4500 SEK (>£300) to do the change. I don't know how they'd charge me so much for this easy job and now that I know how easy it was, I'd never accept a bill from them with that amount.

I hope this workshop will help somebody in the future, if so, please post you comments on it.

Good luck. :)

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  • 3 weeks later...

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Hi GnzYza.

Yes, I finally got it done. Thanks a lot for your help.

Since I was about to do it and had a camera nearby, I thought I'd take some pictures...

When I was done, it turned out it could be a complete workshop, so here it is.


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  • 5 months later...

Thank you for making this toturial Rvall!!

My Avensis have now the same problems as you have discribed earlier. I'll try to replace this switch shortly! And now it even looks easy :)

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THANK YOU Rvall. :thumbsup:

I found this workshop while waiting for my membership confirmation e-mail to post the following question yesterday:

"Hi folks, looks like a very helpful site you have here.

I have a problem with my 1998 Avensis 1.8 GS.

Yesterday When i tried to start her there was nothing beyond the ignition lights,

no attempt to turn over not even a click- nothing. This morning it started fine so took it on a long run

to fully charge Battery then when i switched off and tried to start again, same thing, nothing for

a few attempts then it turned over and started normally.

Im hoping someone might recognise this problem as maybe a relay fault or



P.S. Its been unusually warm the past two days."

Thanks to you and this site the part has been bought (£57) and fitted in 30 mins (15 trying to get the golden screw back in under the cowling ).


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Hey - it worked! I've actually changed the part in 30 mins, and seriously impressed my wife!! (who expected me to use the whole night) :)

Thanks again Rwall!! :D

And If anyone else wold like create any repair-guides my wishes are:

  • how to repair front seat heat
  • econo/power indicator in dashboard (displays if the lean-burn system is active or not at the 1.8 engine)
  • replacing front brake discs
  • and replacing the side door list/fenders. On my car three of the are broken due to ice building up on them in the winter, when you open the door the ice bends in behind the fender and the edge of the fender breaks up.

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Hey - it worked! I've actually changed the part in 30 mins, and seriously impressed my wife!! (who expected me to use the whole night) :)

When will they understand that we are not so stupid as we looks, eeh..., as they think, I mean. ;-P

I'm glad that this has helped some out there. I must also say thank's to GnzYza once again who guided me in the first place.

And If anyone else wold like create any repair-guides my wishes are:


and replacing the side door list/fenders. On my car three of the are broken due to ice building up on them in the winter, when you open the door the ice bends in behind the fender and the edge of the fender breaks up.

Isn't this a strange thing for Toyota? I've had 6 cars in my life time, 3 of them has been Toyota and all 3 have had this problem with the lists. No other car has had it????

On my first, I talked to the garage about it and they said that they need to change all lists for it to look nice (they weren't exactly new so from an estetic point of view, I agree...) and it would cost something around 3000 SEK (£200). Guess what I told them? :P That would be about 5% of the total value of the car.

On that one I bought a special glue made for boats and rough weather and glued it in place. Not a good solution but it worked for the time being. The glue only held on for about a year, so replacing it is much better.

If anyone has actually replaced them, please post how you did it. Only a short guideline is enough as a start.

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  • 2 months later...


You made me one happy man. I found the information on this site about the problem and then got a part on eBay for a tenner. I was about to try changing it and was thinking I had to remove the steering wheel, air bag and all - not happy. Anyway I found this and finished the job in 10 minutes, seven screws out and back in again. my toyota dealer wanted £240 :crybaby: and a mechanic friend who I told about the heat problem thought I was having a laugh :lol: .

Thanks, your instructions are through to the letter.


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  • 1 month later...


Glad I could help you.

I know the feeling you had before starting the project and that's what made me think of doing a tutorial.

I tried to make it as easy as possible.

I've changed server for the pictures, so If the pictures doesn't show, please send me a mail to


As you know, hotmail is the perfect target for spam, so please put something in the subjectline about Toyota Avensis or like, so I'll recognize it from the junk mails...


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  • 8 months later...

Hi Rvall,

I have had the same problem with my Avensis 1.8 VVTI 2000 for every summer (when it was hot weather) for the last couple of years. My Toyota dealer couldn't find out of the problem.

Last week we had temperatures about 30C every day, which caused a lot of startproblems.

Something had to be done, so after I have seen your excellent description how to change it, I bought the part and got it done yesterday. It took 15 minutes. My wife got very impressed of my mechanical skills !

Starts every time now! WROOOOOM

So, thanks a lot Rvall

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My wife got very impressed of my mechanical skills !

Starts every time now! WROOOOOM

So, thanks a lot Rvall

Your welcome.

Isn't it nice when we can show them, why they need us? :thumbsup:

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  • 5 months later...

thanks for posting this thread up

my 2000 avensis 1.8 SE has been giving me starting problems recently, checked the Battery, its fine, changed the starter motor, still giving me problems

was scratching my head, then google'd avensis starting problems and got led to this thread

will try and get the part ASAP and get it fitted

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  • 2 months later...
nice one

i bought the part (£51) from a toyota dealer and fitted it in under an hour

the only problematic bit was getting the top screw in when mounting the new switch assembly

thank you very much for the workshop

thanks to Rvall , for the details.

Have been having intermittent starting issue , that have got worse over the last two week. Search the web last night and found this posting.

Part was in stock at my local garage ( 10B1C IGNITION SWITC T84450-02010 cost 59.15 ) job complete in 30 mins a great morning work ( and saved my £320 that was quoted when i inquired about fixing the problem.)

Starts every time now WROOOOOM ( just like new)

thanks a lot Rvall, :) :) :) :)

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  • 4 weeks later...

Hi all,

Been a while since I dropped in here, but it's nice to see the thread is still helping people.

-> theblindman (Ian)

I thought the same as you, maybe it only ned some cleaning or something, but in my case the plastic and metal parts had been worn down so it would do no good to clean them. Only would work for another week or so.

Take the little extra cost to buy a whole new piece instead, then you'll know it will work for many years on.

And as you all see; if you know what you're doing, it's easy. And you don't need the costly autorepair shops for easy problems.

Please keep posting your successful (and of course less successful) stories...

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  • 1 month later...

Hi, this has worked in the fact that the old Ignition switch was faulty, but I now have another problem no dashboard lights. I can only bypass this by putting a wired link across the Thick white and Red cable on the white chocolate block (bottom 2 connections) then it will fire up as normal, but if I remove this the engine drops out. Has anyone got any ideas will I need to go to the Toyota dealer is it TVSS problem I have 2000(w) 1.8GLS auto Avensis. :(

Hi I have found the problem it was a 30 amp fuse blown under bonnet with the relays, near the Battery. Now working as it should be.

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Had the same problem for a while now, but whigeling the key worked for me.

Today it was nice and warm, I wanted to leave early, put the key in the ignition, turned, whigled, nothing... :censor:

Asked a few collegues to gimme a push to start it.

Raced to the 1st toyata dealer to find out they didnt have the part, but another dealer at the other part of Amsterdam had it, so tried to race to that dealer in half an hour because they where going to close for the evening.

Made it with 5 minutes to spare pfffff.

Fitting was easy with this tutorial, took me about 10 minutes and now it starts without problems :thumbsup:


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  • 4 weeks later...

wish I'd found this forum before I let a local garage replace the starter motor and charge me £200 :censor:

my Avensis is suffering exactly the same problem, even down to the hot weather effect. Its has never actually failed to start but often takes two or three attempts. I did wonder if there was a scond relay in the circuit causing the problem, as there is a slight audible click but not as loud as a starter relay pulling in without contacting properly. The Battery is fine.

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Glad it worked out well in the end. That 30A fuse is causing a lot of strange things to the car.

It's like they put all intelligence in the car into that fuse socket and when it blows, the car becomes just a dumb car... It's like the saying 'the wheel is spinning but the hamster is dead'.


Great, another happy DIY-guy.


Give this tutorial a chance. I promise, you won't be disappointed. I had they starterengine replaced too and was looking for a relay somewhere. Then I found this forum and posted a question here, and got a good answer.

As there are no problems posted here, I guess everybody who have tried this actually managed to change it.

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  • 4 weeks later...

The temperatures have gone up (July 2008) and my Avensis is dead.

It just doesn't start. Why don't the company do something about this? Why don't they fix this problem for all?

I just tried getting the Switch Assy from a retailer in High Wycombe and I was directed to the dealer. Now that's going to cost some £s.

What is the cheapest way of getting a Switch Assy (84450-02010)?

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...I have no idea where you can get the part where you live. But I don't think the dealer would charge you much more than £60 for the item.

That´s what most other people here have paid for it...

Compare that to the quots from the garages; everything between £300 to £500.

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  • 3 weeks later...

Wow, so happy I have found this thread.

Since Saturday my car (R-Reg Avensis) has been showing the same symptons. It starts first time on a morning, and last thing at night but in the afternoon and evening when it has been hot it won't start at all or eventually does on the 4th or 5th attempt (I usually have to put my foot down on the accelator as it's trying to start to get it fully kick in). I never experienced any problems until the heatwave kicked in.

The only other thing that is slightly different with my car is that once it has actually started it has been fine everytime except once on Sunday when I parked up and went to pull off it stalled, I got it started again but it was only cycling at 700 rpm when usually it alters between 1000 - 1200 rpm when it is first started (I'm hoping this was just a freak occurrence and not something more serious).

I'm going to try this technique as it seems to be the same problem. I ordered the part from an ebay seller It had cost £46 including delivery. They look like an ok seller and have decent feedback, also an email address (enquiries@japarts.co.uk).

Hopefully this will solve my problem, we shall see tomorrow night (if the part comes in the morning).

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-> Bojimha


it partly sounds as the same problem. But on the other hand, you could have two different problems at the same time.

The switch could of course also be worn down in the ON-position, causing the engine not running ok, but that doesn't sound so likely.

For the actual starting problems, this looks very similar to my problems before. So here I think you might have a chance to improve you driving pleasure by changing the switch as described.

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