Yet another Yaw sensor thread...

Loddzz · Post by **Loddzz** » 21 Feb 2020, 11:10

Okay guys, i need some help with my 2003 XC90 D5

I just got the car, like 2 weeks ago, and there was many codes when i plugged it in
the first time. So i´ve been fixing everything, thing by thing, but there´s one code that i can´t
get rid of.

ABS-0080

When i start the car i get a "Brake assistant, service..." and "Traction control, service..." and the orange triangle, and when i reach about 40Kmph i get the same messages again, plus that the ABS light comes on.
Everything else works, odometer, cruise control etc.

I´ve checked all the fuses, opened up the Yaw sensor, and it was a bit broken inside. so i got another one from the junkyard, cleaned it up on the inside and the connections, and tried to calibrate it(without Vida).
When that didn´t make any difference, i opened up the BCM but couldn´t find anything bad there, and the same with the traction control module...

Here´s the values that it gives(the "new" Yaw sensor gives the same values as the old one)

But i have no idea what the values should be...
Does anyone have the knowledge to help me get rid of this code?

Post by **RickHaleParker** » 21 Feb 2020, 22:24

BCM-0080 Lateral accelerometer. Incorrect offset value

Diagnostic trouble code (DTC) information

Condition
Note! The diagnostic trouble code (DTC) applies only to cars with dynamic stability and traction control (DSTC).
The yaw rate sensor, lateral accelerometer, accelerometer (only AWD) and angle of lean sensor (only RSC) are integrated in the active yaw control sensor for DSTC. The sensors transmit information to the brake control module (BCM) indicating the size of the yaw angle, the lateral acceleration of the car, the forward acceleration and the lateral angle of lean via its own internal Control area network (CAN). Each sensor has an offset value, correction value, for the individual sensor offset.
Diagnostic trouble code (DTC) BCM-0080, BCM-0081, BCM-0082 or BCM-0083 is stored, depending on the sensor, if the control module registers an incorrect offset value from any of the sensors.

BCM-0080: Lateral accelerometer
BCM-0081: Accelerometer
BCM-0082: Yaw rate sensor
BCM-0083: Angle of lean sensor.

The diagnostic trouble code (DTC) can be diagnosed while the ignition is switched on.

Substitute value
Traction control is blocked
Stability control is blocked
Active yaw control is blocked
RSC system is blocked (cars equipped with RSC only).

Hint: For information about brake system abbreviations, see Bromssystem, förkortningar .

Possible source

Active yaw control sensor incorrectly installed
The active yaw control sensor is loose
The bracket for the active yaw control sensor is bent
Internal fault in the active yaw control sensor.

Note! This diagnostic trouble code (DTC) is not due to an internal hardware fault in the Brake control module (BCM) and must not be remedied by replacing the control module.

Fault symptoms
The anti-spin warning lamp is lit (up to and including 2002 model year)
General yellow warning lamp lit (from model year 2003)
Text window and warning symbol/Red symbol and text message
Anti-spin does not function
The stability control system does not function
The traction control system does not function.

Loddzz · Post by **Loddzz** » 22 Feb 2020, 02:20

Yeah, i know all that...
I have Vida as well, not the DiCE tho.

The Lateral accelerometer offset value is -0.22 m/s2, which is the same
value as the "old" sensor gave.

So the offset value doesn´t change, and i need to figure out why

Loddzz · Post by **Loddzz** » 22 Feb 2020, 06:23

Okay, so i tried to see if the sensor got enough power, and according to Vida it’s supposed to look like this on the YAW sensor connector:

1. (2-3V, CAN L)
2. (2-3V, CAN H)
3. (+12V)
4. Not used
5. (- ground
6. Not used

And this is what I’ve got on mine:

1. (1,8V, CAN L)
2. (3,2V, CAN H)
3. (+12V)
4. Not used
5. (- ground)
6. Not used

I’m thinking that maybe 1,8V is too low? Does anyone know what the values should be?

I also measured it on the BCM and i get the same readings there as I get on the YAW sensor...
And I measured the resistance on the CAN H, and on the CAN L wire, and they match

Post by **jimmy57** » 22 Feb 2020, 06:55

The CAN values are OK. the CAN from BCM to the sensor unit is a little off from the CAN voltage on the full network CAN.
I think there was not a successful calibration if that offset remains unchanged from the value with previous unit. Is your steering wheel straight while traveling on a good flat road with no wind?

Loddzz · Post by **Loddzz** » 22 Feb 2020, 12:21

Hmm okay...
CAN H was moving between 3-5V when i moved the sensor around, just as it should.
But CAN L stayed at 1.8V and didn´t change at all... Vida says CAN L should move between 1-2.5V

Steering wheel is straight, and i´ve checked the degrees of the steering wheel with my code reader, and it seems
to be okay.
I´ve tried to do the adaption of the YAW sensor, a couple of times, but it doesen´t seem to work. Tried on the old one
as well.

But since CAN L doesn´t change, makes me think that the problem is there. But i don´t really know how to proceed...

Loddzz · Post by **Loddzz** » 24 Feb 2020, 12:47

I´ll probably end up getting a new sensor anyway, but can i change my aluminium one
to the newer one in plastic that came on the 2007 model?

V50RobC · Post by **V50RobC** » 30 Oct 2022, 07:06

Hi There,

Well I've been looking for a cheap 4x4, but with comfort and always liked the XC90 D5 AWD. Anyway I've picked one up for not much with the knowing of it having a fault, which was apparently the transmission at fault. I may of stumbled on the problem as i was testing the wiring and got to the active yaw, which didn't look so good from the out side, so decided to open it up to find it basically full of water.

Has anyone came across this and how to prevent water getting to it again?