I have a Celica ST203, a Gen 6 model with AWS. I hope the AWS system is similar to the ST183. Here is my story so far. I had the dreaded AWS warning light problem so after reading the files section thought it was time to sort it out. The car was meanwhile passing MOT's no problem. Step 1 was to investigate the speed sensor,(listed as an ABS sensor by Mr. T.) As I had slapped a wall with the nearside front wheel and had to replace the drive bearings this was my prime suspect. So off with the wheel to release the sensor locating bolt. The sensor fell off in my hand, and I had to drill out the remains. The source of the problem I thought, so off to Mr. T for the part. Once fitted I was disappointed to find the same problem. Step 2. After reading more of the files section I located the relays in the engine compartment, checked they operated and swapped them to see if that resolved the problem, sadly not. So on to step 3. Under the car I have removed the two motors and their connecting gearbox from the rear steering box, shearing a bolt in the process, a sign of things to come. I soaked all the motor fixing screws with WD40 hoping they would come undone, and left them overnight. So it was time to strip the motors from the gearbox assy in search of a problem. Unsure of which motor is which I started with the one with the cylindrical housing, True to form the Phillips screws holding it in place were corroded and rounded as I tried to undo them so it was out with the drill and stud extractors but still struggled. Eventually I parted the casing from the gearbox and found that the motor was apparently OK (I have not tried to power it yet!) On to the other motor with a flattened case. Once again the screws proved impossible to get out without stud extractors, and as I pulled the case off, half of one of the magnets came with the armature. Problem found I thought. Further investigation showed that at some time water had found its way into the housing, both magnets had come free. So where to now. I might be able to mastic the magnets back in place but I think that the clearances would be too critical for the motor to run. I have been in contact with Mr T and the broken motor is apparently available from Japan for over a hundred pounds. If I can do it I will post a picture of part numbers for the ST203 and some progress pictures on the site later. I now have to wait a week to see if Toyota can supply the part. Other points. Which motor is the backup motor, is this the one that usually fails? One motor appears to have a smoothing capacitor built into it, the other appears to have a thermal overload device. Is there anyone with an AWS Celica for breaking with a complete working motor assy.

Sounds like you've done a similar amount of work to many of us who have the dreaded 4WS light. After many skinned knuckles and many a rude word I found the best cure for the fault was to trade it in. I drive something wholly unremarkable these days and still miss the 183. It's without doubt the best car I ever owned, but I couldn't make it work... Good luck sorting yours, I hope you have the success that I didn't!   Dave.      

The Celica is my third car, unfortunatly all the others drink petrol at an alarming rate, the Toyota Supra TT being the worst. So in the interests of my wallet the idea was to get the Celica back up and running properly and enjoy saving some money on fuel, figuring that ?200 spent would be worth the fuel saved. A bit cheaper than buying yet another car! Have just checked the one 'good' motor and it appears to run OK if a little noisy, also called Mr. T and other motor is not expected till 12 July so car will remain up on blocks until at least then. I thought I had found a 2nd hand parts dealer that had a complete rear steering axle for ?70.00 but they have sent me a front steering rack. If they fail to supply or refund money I will be posting their details as an avoid at all costs. Luckily my credit card covers me for incorrect goods so I will not lose any money.