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4ws problem

 
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Old 12-03-2011, 05:13 AM
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4ws problem

Hi all :)

recently i have changed 4ws control unit, and when i started the car, 4ws light was on, but after about 5 seconds,4ws contol unit had strange noise, and 4ws light tuurned off, back wheels were working perfectly, but after few minutes of driving, 4ws control unit has the same strange sound, and after that light goes on, and back wheels is not turning any more, maybe anyone had this problem???

Last edited by Justinas; 12-03-2011 at 05:17 AM.
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Old 12-03-2011, 01:17 PM
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Re: 4ws problem

pull the code, it will tell you the problem. check the 4th gen resource guide on how to pull the code, and for a list of the codes.
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Old 12-03-2011, 03:48 PM
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Re: 4ws problem

i am thinking about resoldering some points, becaue that sounds like relays.

and i've got codes, it 28
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Old 12-04-2011, 05:09 AM
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Re: 4ws problem

I came across on this forums once before. its different code but this step might help you out.

Im sorry if I break the policy but this might help more luders

-------------------------------------------------------------------------------------------------------

I will describe you how to do. To do this you must be familiar with some electromechanics. If you are not, please ask someone to do this, otherwise you can permanently damage the 4WS unit. And sorry for my poor english - I have learnt it at school, but never used after.

I have bought a second 4WS unit (mine is working fine for the moment), when I put it into my car for tests it was showing a permanent error code 62: rear accurator or something like that.

As my accurator worked fine with my original unit, I considered that the problem must be inside 4WS unit. After some hours I found a problem: broken solderings inside 4WS unit, due to age of the unit or (and) vibrations.

The solution is to resolder these broken points inside the unit.

1. Disconnect battery
2. Remove 4WS unit from car (before to get access you have to take off left rear seat and rear moulding inside trunk): disconnect 3 (If I remember well) connectors, 1 or 2 grounds, remove metal cover, and finally remove the unit.
3. Open 4WS unit (6 screws) and carefully put the cover (there is an electronic board connected with one electrical stripe) on the side. I used a big large book to put the cover on and not to brake the stripe. Finally you will have cover on the left side (laying on the book) and open 4WS unit on right side.
4. Remove internal metal cover you will see on the right side (some screws) and take it off.
5. You will see a lot of electronical (and electromechanical) parts inside. There are two black boxes (about 1 cm x 1.5 cm) little under the center of the unit. These boxes are 2 small relays. The problem is there!!! , but on the other side of electronic board, so next step is....
6. Remove the main electronic board from the box: remove all screws that fix the board to the box and other components: I am unable to say you exactly how many of them you have to unscrew - I just don't remember, but you will see yourself what is keeping the board in place. Also it is necessary to unscrew 8 big transistors from box (serving as radiator).
7. When the board is unscrewed, put some protecting paper (ex. newspaper) on the cover board laying on the book and carefully extract the board from aluminium box. Put it on the newspaper with solderings side upper.
8. These 2 relays are soldered 4 or 5 points every of them. These are big solderings. I took a magnifing tool (don't know exact english name - zoom ???) and carefully watching the relays solderings I considered ALL of them were broken.
9. Resolder all relays points and mount the unit.
10. After reputting it in the car problem's GONE!!!!
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Old 12-04-2011, 08:58 AM
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Re: 4ws problem

Hi, thanks for post!!! :)

i know, that mine error code is different and problem should be in front main steering angle sensor, but 4ws sounds strange before 4ws light offs, so first of all i will resolder relays( not by myself), and then i will hope, it will work perfectly
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Old 12-05-2011, 11:54 PM
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Re: 4ws problem

4ws ecu was resoldered, problem is not gone

and i found one thing, that start the engine and wait till the 4WS light goes out. then turn the wheel full lock to the left, then full lock to the right, then full lock to the left and full lock to the right then center.

this must be done as it sets the 4WS parameters in the 4WS ECU.

when i was turning last time to full lock to right, 4ws light went on....
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