With HDC engaged, the speed of descent can be altered using the cruise control steering wheel switches, as follows:

• • To increase speed press and hold the + switch (2) until the desired speed is achieved.
• • To decrease speed press and hold the - switch (3) until the desired speed is achieved.

When the switch is released, the selected speed will be maintained.

To increase or decrease speed gradually, tap the + or - switch as required. Each tap of the switch will increase/decrease the speed in increments/decrements of 0.3 mph (0.5 km/h). The accelerator pedal can also be used to increase speed, up to the threshold in each gear.

Note: Each gear has a pre-determined minimum speed.

Descent speed will only increase on a slope steep enough to provide additional momentum. Therefore, use of the + switch on a gentle slope may not increase the speed. If the brake pedal is depressed, HDC will be overridden and the brakes will operate as normal. When the brake pedal is released, HDC will resume control of the descent.

If HDC is switched off during a descent via the brake pedal, HDC assistance will fade out gradually. This is to prevent loss of control if HDC is switched off in error. HDC will resume control when switched back on if assistance is still required, but at the speed the vehicle is traveling when the brake pedal is released.

WARNING

Do not attempt a steep descent if HDC is inoperative or warning messages are displayed.