S80 Vida code

[whorlow70]

Hi, I have a 2007 S80 AWD V8 with 4C suspension, Adaptive Cruise Control, Collision Control. And since ive changed the front and rear brake pads i now have an error Vida BCM-C006264 which states Longitudinal Acceleration Sensor. This means that the DSTC, No Cruise control, Collision Control not working. Now it must be something to due with the brakes but why would changing the brake pads cause this problem as everything was working absolutely perfect up to this point. Could anyone suggest something for me please as im just so frustrated. I have looked under the seats for a sensor but all i can see is the Amp for the radio etc.

Thank you in advance

[reggit]

What does Vida say when you look at 'fault trace'?
It should tell you where to look.

[whorlow70]

Originally Posted by reggit

What does Vida say when you look at 'fault trace'?
It should tell you where to look.

Not sure to be honest I was just given the code, and told its the Longitudinal Acceleration Sensor but im so confused as it only happened when pads were changed so why would that sensor go?

[cheshired5]

Vida will explain the code and the possible causes and fixes so ask whoever read the car to look it up or Google the code.

[Keefie]

Not sure if this is of any help, but here are details from VIDA.

593: BCM-C006264 Longitudinal Acceleration Sensor. Algorithm Based Failures. Signal plausibility failure

Condition

The yaw rate sensor, lateral acceleration sensor and acceleration sensor are integrated in the body sensor cluster stability sensor (BSC). The sensors measure the yaw rate, the vehicle's lateral acceleration and forward acceleration. The stability sensor then transmits the information to the Brake control module (BCM) via the internal controller area network (CAN). Each sensor has an offset value, correction value, for the individual sensor offset.

The diagnostic trouble code (DTC) is stored if the control module detects that:

The signal during comparison does not correspond with the calculated value.

The control module's test for the diagnostic trouble code (DTC) starts in the event of:

Ignition switch position II.

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.

Substitute value
Traction control (TC) blocked.
Stability control (SC) blocked.
Active yaw control (AYC) is blocked.
Hint:
Brake system, abbreviations
Possible source
Body sensor cluster (BSC) is incorrectly installed.
Body sensor cluster (BSC) is loose.
Bracket for the body sensor cluster (BSC) is bent.
Internal fault in the body sensor cluster (BSC).
The vehicle has reversed faster than 70km/h.

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 symptom[s]
PA, Anti-spin function/Does not work
PD, Brake pedal/Excessive "brake pedal effort" required
AQ, Cruise control/Does not engage
2F, Front monitoring/Active safety/City Safety does not work
PJ, Stability function/Does not work
DY, Warning lights and chimes/Antispin/antiskid (DSA, ESC/DSTC, STC, TRACS) indication/no indication
1X, Front monitoring/Active safety/Adaptive cruise control does not work
1W, Front monitoring/Active safety/Collission warning with brake support does not work

Fault Tracing

Checking the component
Ignition off.

Check that the body sensor cluster (BSC) is securely installed on the bracket under the passenger seat. Check that the bracket is not bent or damaged in any other way.

If the diagnostic trouble code (DTC) recurs, replace the Body sensor cluster stability sensor (BSC).

Remedy as necessary.


Have you tried clearing the code in VIDA ?

[Keefie]

Just another thought.

May be totally unrelated, but sometimes issues in one area throw up codes in other areas. Do you have any other DTCs ?

As you've been working on the brakes and close to the ABS sensors, I'd check the wiring etc to the sensors.

[Tatsfield]

The vehicle has reversed faster than 70km/h.

Let's hope it wasn't this that caused the fault!

[whorlow70]

Originally Posted by Keefie

Just another thought.

May be totally unrelated, but sometimes issues in one area throw up codes in other areas. Do you have any other DTCs ?

As you've been working on the brakes and close to the ABS sensors, I'd check the wiring etc to the sensors.

the system was cleared and this is the only error that occurs. Nothing about ABS sensors specifically and the wiring to the sensors is in good condition. When the error is cleared it doesnt always reoccur straight away when the car starts, it could take a while maybe 5 mins or so. does that help at all with symptoms?

[rxtian]

Just thinking out loud, but I can see a way the wheel speed sensors could cause this:
The system is probably checking the plausibility of the accelerometers in that module by comparing it to what the car is doing - read from the wheel speed sensors...

I’d get the live data up while rotating each wheel and check they all read consistently.

[Keefie]

Having a look at the BCM parameters in VIDA shows a number of lateral accelerometer signals and values and the following info:

Lateral accelerometer, signal

The value indicates the lateral accelerometer signal, i.e. the lateral incline of the car. The signal from the lateral accelerometer, which is integrated in the Body Sensor Cluster Stability Sensor (BSC), transmits information to the Brake Control Module (BCM) about the lateral acceleration of the car. Turning left produces a body roll to the right, giving a positive value. Turning right produces a body roll to the left, giving a negative value.
Measurement range: -20 - +20 m/s2

Hint:
The value can be influenced by changing the sideways incline of the car, for example by raising the right or left-hand side of the car.


As rxtian indicates, it would be a good idea to check the wheel spin speeds and reference value and I'd also check the accelerometer signal and offset and stored values.