SAS calibration after alignment

[RCF5v8]

I have a 2015 RCF and am planning to have the wheel alignment done. Does the Steering angle sensor need calibrating after it’s been done or does it self calibrate?

[ColinBarber]

Both the stability control system (yaw rate / acceleration sensor and roll rate / vertical acceleration sensor zero point calibration) and lane keeping system should be calibrated after wheel alignment and aren't self calibrating. Steering centre calibration for pre-crash safety is self calibrating and park assist will ask for driver calibration if needed where you go full lock-to-lock.

[RCF5v8]

Thanks for your help. I presume I can do the calibration using techstream ?

[ColinBarber]

11 hours ago, RCF5v8 said:

Thanks for your help. I presume I can do the calibration using techstream ?

Yes. Not sure on the camera alignment procedure but the stability control calibration requires the car to be on completely flat ground. 

[DAW]

On 2/22/2024 at 9:04 AM, ColinBarber said:

Both the stability control system (yaw rate / acceleration sensor and roll rate / vertical acceleration sensor zero point calibration) and lane keeping system should be calibrated after wheel alignment and aren't self calibrating. Steering centre calibration for pre-crash safety is self calibrating and park assist will ask for driver calibration if needed where you go full lock-to-lock.

Didn’t realise this as I have recently had 4 new tyres & 4 wheel alignment done by tyre specialist.  
I take it I need the dealer to sort this? - pity as the car was serviced on Saturday!

[RCF5v8]

Yes dealers can do it. I think a lot of people don’t seem to bother unless they get faults on the dash coming up. To be fair I would think there is probably only going to be issues if the adjustments to the alignment required were quite large. After I had my alignment done I checked the steering angle sensor and it still read zero in the straight ahead position, similarly the yaw sensor read zero too.
 

That said, I did carry out zero point calibration using techstream which is free to download if you’re reasonably tech savvy; you need a cable too to connect to OBD port to a laptop. If you get one make sure it’s firmware version 2.0.4, the lower firmware versions have limited functionality; most on eBay seem to be the lower firmware. You should be able to set yourself up with all you need for about £70 for dealer level diagnostics software which can read all ECUs on the car and perform error code reading/resets and configurations/calibrations. The process for zero point calibration is straight forward, the hardest thing was finding some level ground with less then 1 degree variation! 
 

[DAW]

@RCF5v8 Thanks for the info - will probably just get the dealer to sort it as that will be quicker I suspect.

My car is pretty low mileage, so just changed the original tyres as I was concerned about rubber being beyond its best, even though there was plenty of tread left. Similar situation with my previous ISF, which was even lower mileage, so this is actually the first time I’ve had to change tyres in nearly 10 years on a Lexus.