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chasing the anti skid gremlin

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
ylwgto
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Re: chasing the anti skid gremlin

Post by ylwgto » Tue Aug 14, 2018 9:51 am

Bought a used TCM from an '04. Doing the swap this weekend. Fingers crossed this will restore the system connection and let me recalibrate the sensors with my scanner. Otherwise, I think the yaw sensor is next on the list...



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Re: chasing the anti skid gremlin

Post by jimmy57 » Tue Aug 14, 2018 1:38 pm

The SAS on 05 and later is part of the SWM and no longer has the separate module next to CEM.



ylwgto
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Re: chasing the anti skid gremlin

Post by ylwgto » Tue Aug 14, 2018 1:52 pm

jimmy57 wrote:
Tue Aug 14, 2018 1:38 pm
The SAS on 05 and later is part of the SWM and no longer has the separate module next to CEM.

yep, mine is an '04...i had a typo in the original posting.

thanks!



ylwgto
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Re: chasing the anti skid gremlin

Post by ylwgto » Sat Aug 18, 2018 10:35 am

Changed TCM under dash today. Still unable to connect to “SAS” to read codes with my ICarsoft scanner and anti skid service still in window. What’s next? :(



ylwgto
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Re: chasing the anti skid gremlin

Post by ylwgto » Tue Aug 21, 2018 10:26 am

After running scanner:

DEM: no DTC (phew)
SAS: "Failure in communication with vehicle ECU"
ABS: DTC present. "Lateral Accelerometer. Incorrect offset value ABS-0080"

There are no ABS dash lights or OBDII faults. The only dash message in window is the "Anti Skid" warning and the triangle exclamation point.

Is the lateral Accelerometer the yaw sensor under the drivers seat? I absolutely had mis-routed sunroof drain (i've resolved) and lots of water got into floorboards.

side note, just changed to NGK copper plugs and it runs like a totally different car! electrodes on old denso plugs were almost burned away and the gap was HUGE.



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ggleavitt
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Re: chasing the anti skid gremlin

Post by ggleavitt » Tue Aug 21, 2018 10:57 am

I believe the lateral accelerometer is indeed within the yaw sensor. If it's not broken outright, a BCM calibration via VIDA/DICE may put it back to working properly.

The SAS code I cannot help with, although I do indeed suspect if you were to connect the same VIDA/DICE that you'll maybe need to resolve the yaw issue, you might find further detail.

See attached for diagrams of data connectivity
DataComm2004_XC90.JPG
DataComm2004_XC90.JPG (75.38 KiB) Viewed 403 times
BCM 2004_XC90.JPG
BCM 2004_XC90.JPG (103.72 KiB) Viewed 402 times
, taken from https://www.myvolvolibrary.info/Tech_fi ... Wiring.pdf

edit 8/21/18- add BCM diagram


2005 2.5T AWD-194k
2008 V8 AWD Sport-124k

ylwgto
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Re: chasing the anti skid gremlin

Post by ylwgto » Tue Aug 21, 2018 11:29 am

Awesome diagrams, thanks. I'm trying to determine where the lateral accelerometer is in the diagrams (is it the LSM in figure 1?).

I did a recalibration on my Icarsoft scanner (I assume this borrows from VIDA/DICE software). I am able to ru n the calibration, btu it does not seem to resolve the connection issues with SAS system or the ABS lateral accelerometer code.

All things point to the yaw sensor now, so I think I'll just replace it and see what happens then.

I am collecting replacement parts that were not needed!!

thanks



ylwgto
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Re: chasing the anti skid gremlin

Post by ylwgto » Tue Aug 21, 2018 11:48 am

is replacement part for the yaw sensor 31110063 8691675?

and is sensor under driver or passenger seat (I've read both on forums)?

again, my car is an '04 xc90 2.5 AWD w/ DSTC

thanks!



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ggleavitt
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Re: chasing the anti skid gremlin

Post by ggleavitt » Tue Aug 21, 2018 12:41 pm

I think it's the 7/164 in the BCM diagram. I believe 31110063 is the correct part number for XC90 chassis (last 6 of VIN) prior to 356815.

http://volvopartslisle.com/assembly/799 ... Sensor-Bsc


2005 2.5T AWD-194k
2008 V8 AWD Sport-124k

ylwgto
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ylwgto

Re: chasing the anti skid gremlin

Post by ylwgto » Tue Aug 21, 2018 12:53 pm

ggleavitt wrote:
Tue Aug 21, 2018 12:41 pm
I think it's the 7/164 in the BCM diagram. I believe 31110063 is the correct part number for XC90 chassis (last 6 of VIN) prior to 356815.

http://volvopartslisle.com/assembly/799 ... Sensor-Bsc
excellent, thank you. will be ordering a used one soon

i assume despite being a very movement sensitive part, having a used one that has been removed from a donor car and shipped won't be an issue as it will be recalibrated once installed anyhow?



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