XC90 AWD V8-4.4L VIN 85 B8444S (2005)
When a vehicle is connected to VIDA, all brake control parameters can be analyzed by using Vehicle Communication, see picture 2. The path to this
function is: Diagnostics > Vehicle Communication > BCM (Brake Control Module) > Parameters. Note that there are tabs for descriptions and a graphic
window for the parameters.
While driving, the sensors in picture 1 continuously measure the concerned parameters. At the same time, each parameter is calculated based on input
from the other sensors. For example: The yaw rate is measured by the sensor cluster and is at the same time calculated by input from the four wheel
speed sensors, the steering angle sensor, and the lateral accelerometer in the sensor cluster.
If the measured and calculated values do not match, a DTC (Diagnostic Trouble Code) is set and the warning light and/or message are displayed.
See Service A for related DTC's and for possible causes.
Service B describes the repair for a specific driving situation.
Service:
A.
DTC: BCM 0121 / C006364 - Signal outside its permitted range
According to our analysis of returned components, these DTC's are usually not caused by a hardware fault with the sensor cluster or BCM. To
ensure customer satisfaction with the repair, make sure the basics below are covered. These are the more likely possible sources of DTC's BCM
0121 / C006364.
^
Check all cable harnesses and connectors for: the wheel speed sensors; the sensor cluster; the steering wheel sensor; and the BCM. Check
for contact resistance and oxidation.
^
Make sure that the wheel alignment is within specification.
^
Are there any loose or worn out suspension components?
^
Calibrate the BCM on a flat surface according to VIDA.
^
Make sure that the wheel speed sensors are in the correct position and that the sensors are not dirty or have any metallic components on
them.
^
Are all four tires the correct specification, and are they all the same brand, type and dimension? Is the tire circumference the same on all
four tires?
^
Make sure the steering angle sensor works properly.
^
While driving straight, does the steering angle sensor measure 0 degrees?
^
Is the CAN (Controller Area Network) working properly?
