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Discussion Starter · #1 ·
Hi,
I have a question pertaining to 2006 XC90 2.5T FWD. I know the vehicle has DSTC, but how do I know if the vehicle also has (or does not have) STC, too?

Thank you!

CJ
 

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Everything you wanted to know and more:

The brake control system, as a factory installed option, can be supplemented with:
TRACS (TRAction Control System)
STC (Stability and Traction Control)
DSTC (Dynamic Stability and Traction Control).

TRACS
TRACS is a traction control system which is integrated with the ABS system. TRACS is only available on all-wheel drive (AWD) cars. The traction control system distributes driven power between the wheels so that the wheel with the best road traction receives the greatest amount of driven power. The system is mainly designed to assist with moving off on slippery surfaces at speeds up to approximately 60 km/h. TRACS has only a very limited effect at speeds over 60 km/h. TRACS (traction control system) is always engaged when the ignition is switched on. TRACS (traction control system) is engaged and disengaged using a switch under the climate control module (CCM). From model year 2003 inclusive, the TRACS function cannot be disabled manually.

STC
STC (stability and traction control) consists of two components:
Traction Control - this function is described above under TRACS. The traction control function is always engaged when the ignition is switched on. The traction control function together with the stability function is engaged and disengaged using a switch under the climate control module (CCM). From model year 2003 inclusive, the Traction Control function cannot be disabled manually
Stability Control - stability system which is integrated in the ABS system and stabilizes the car in the event of wheel spin. The brake control module (BCM) transmits a signal to the engine control module (ECM) to reduce engine torque until the slipping wheel(s) has/have stopped spinning. The stability function is always engaged when the ignition is switched on. The stability function together with the traction control function is engaged and disengaged manually using a switch under the climate control module (CCM).

DSTC
DSTC (Dynamic Stability and Traction control) - a dynamic anti-slip system which is integrated in the STC (stability and traction control) system. The DSTC (dynamic stability and traction control) function is engaged when the ignition is switched on but can be disengaged or engaged manually using the switch on the climate control module (CCM).
The DSTC (Dynamic stability and traction control) system consists of the following:
Traction Control - This function is described above under TRACS
Stability Control - Described under STC above
AYC (Active Yaw Control). The system is based upon a number of sensors which sense the driver's steering movements (steering wheel angle) and the directional, both straight and lateral, movement of the car. The information is used to correct the car in the event of oversteer or understeer.
RSC (Roll over stability control) is a function which monitors the tilt angle rate. If the driver turns the steering wheel quickly, during an avoidance maneuver for example, and the car is likely to tip over, the tilt angle sensor registers the rate at which the tilt angle is changing. The DSTC system rights the car. RSC (roll over stability control) is only available on the XC90

Emergency Brake Assistance is a new function found in cars equipped with DSTC (dynamic stability and traction control) from model year 2002-. The function is integrated in the brake control module (BCM) and monitors the movement of the brake pedal. A sudden movement of the brake pedal (emergency braking) deploys the emergency brake assistance function to achieve optimum braking (more effective than normal braking). Information from the pedal position sensor is used to start the emergency brake assistance function. Full braking force is maintained for as long as the driver maintains or increases the pressure on the brake pedal. If the driver releases the brake pedal the emergency brake assistance function is immediately interrupted. Emergency brake assistance operates from approximately 10km/h up to the maximum speed. This function cannot be switched off.
 
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