Stability System - Volvo V70 Owner's Manual

Stability and Traction
Control STC/DSTC*
The STC system (Stability and Traction
Control) contains the functions TC and SC.
The DSTC system (Dynamic Stability and
Traction Control) contains the functions TC,
SC, AYC and EBA
Traction Control - TC
(Traction Control, TC)
The traction control transfers the motive power
from a drive wheel that spins on the road
surface to the drive wheel that does not spin by
braking the wheel that starts to spin. In order to
increase accessibility in this situation you may
need to press the accelerator harder than usual.
A pulsing sound can be heard when traction
control is working. This is completely normal
for the system. The TC function is mostly
active at low speeds. It cannot be deactivated.
Stability Control - SC
(Stability Control, SC).
Stability Control is designed to prevent the
drive wheels spinning on the road surface
during acceleration, by lowering the engine
torque on the drive wheels. This improves
accessibility and road safety in slippery road
conditions. In specific conditions, for example,
driving with snow chains, in deep snow or
sand, it can be beneficial to deactivate the SC
function to increase traction. This is then done
using the DSTC button.

Stability system

Active Yaw Control - AYC
(Active Yaw Control, AYC)
The anti-skid function performs automatic
braking on one or more of the car's wheels.
This stabilises the car if it starts to skid. If in
this situation you attempt to apply the brakes
yourself, the brake pedal will feel harder than
normal and a pulsing sound will be heard. The
AYC function is active the whole time and, for
reasons of safety, it cannot be deactivated.
AYC in the V70 R
In the V70 R, this function can be switched off
with the DSTC button. However, the procedure
requires that function deactivation/reactivation
is repeated three times (push the button five
times in succession) in order to completely
deactivate the AYC function. "DSTC ANTI-
SKID OFF" will be shown on the display.
Emergency Brake Assistance (EBA)
(Emergency Brake Assistance)
The EBA function is an integrated part of the
DSTC system. The system is designed to
provide full braking force immediately when
rapid braking is necessary. The system senses
when you need to brake heavily by registering
how quickly you press down the brake pedal.
The EBA function is active at all speeds and,
for reasons of safety, cannot be deactivated.
NOTE! When the EBA function is active the
brake pedal sinks at the same time as the car has
maximum brake force available. Continue
applying the brakes without releasing the
pressure on the brake pedal. The EBA function
disengages when the pressure on the brake
pedal is eased.
STC/DSTC button
The STC/DSTC button in the centre console is
used to reduce or reactivate the STC/DSTC
system.
When the LED in the button comes on the
STC/DSTC system is activated (if no fault
arises).
When reduced the stability control (SC) is
deactivated and the active yaw control (AYC) is
reduced. Other functions are not affected.
NOTE! In order to reduce the effect of the
STC/DSTC system for reasons of safety the
button must be held in for at least a half second.
The LED in the button goes out and the
display shows: "STC SPIN CONTROL
OFF"/DSTC SPIN CONTROL OFF".
R version: "DSTC REDUCED FUNC-
TION" will be displayed.
The STC/DSTC system is automatically
activated each time the engine is started.
* The STC and DSTC system is an option on
some markets. The system is standard in the R
version.
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