System operation
The speed control system is inoperative below 27 mile/h (43 kph) and inoperative above the following speeds
- 120 mile/h (193 km) for vehicles fitted with 2.5L/3.0L engine and automatic transmission.
- 125 mile/h (201 km) for all other variants.
The speed control system is designed to maintain a selected vehicle speed between these two parameters.
Any of the switches operated by the brake or clutch pedal (vehicles fitted with manual transmission) will interrupt the speed control operation by switching the signal to the engine control module (ECM). This will allow the system to go into STANDBY mode. Pressing the RESUME switch with the vehicle travelling above 27 mile/h (43 kph) while the system is in STANDBY mode will allow the vehicle to accelerate until the last set speed is resumed.
The speed control system is inoperative below 32 kph (20 mile/h) and inoperative above 250 kph (155 mile/h).
The speed control system is designed to maintain a selected vehicle speed between 32 kph (20 mile/h) and 180 kph (112 mile/h).
Any of the switches operated by the brake will interrupt the speed control operation by switching the signal to the engine control module (ECM). This will allow the system to go into STANDBY mode. Pressing the RESUME switch with the vehicle travelling above 32 kph (20 mile/h) while the system is in STANDBY mode will allow the vehicle to accelerate until the last set speed is resumed.
Scheme 2
Principles of Operation
There are two types of speed (cruise) control fitted, adaptive cruise control (ACC) and non-adaptive cruise control.
The non-adaptive system maintains a road speed selected by the driver from the steering wheel switches, and is cancelled by inputs from the steering wheel CANCEL switch, the brake pedal (the system will disengage if the brake pedal is pressed), road speed (the system will disengage if the road speed falls below 26 kph [16 mph]), gear selector position (the system will disengage if NEUTRAL, PARK or REVERSE gears are selected), traction or stability control (the system will disengage if the traction or stability control is activated).
The adaptive system also maintains a road speed selected by the driver from the steering wheel switches, and is cancelled by the same inputs (the only difference being that the selected speed will show in the message center display), but can also maintain a selected distance from the vehicle in front.
When the system is enabled, the vehicle will maintain the selected speed until another vehicle is detected travelling in the same lane and direction, when it will enter FOLLOW MODE.
In this mode, the vehicle will maintain a time gap from the vehicle in front, rather than the selected speed. This is not a fault , but a designed feature of the system. The time gap is adjustable, using the HEADWAY switches on the steering wheel switchpack, but will default to a longer gap, unless overridden by the driver.
When the vehicle enters FOLLOW MODE , the message center will display the ACC tell-tale symbol (see the owner's handbook), with a GAP indication for four seconds, and the vehicle will maintain the gap from the vehicle in front until
- The vehicle in front accelerates to a speed above the selected speed, in which case the selected speed will be resumed
- The vehicle in front moves out of lane, or out of view, in which case the selected speed will be resumed
- The vehicle in front slows to below 26 km/h (16 mph), at which speed the system disengages, the message DRIVER INTERVENE will display on the message center, and any braking applied by the ACC system will reduce. This is not a fault but may involve the driver having to take control and brake him/herself.
- A new gap distance is set by the driver from the steering wheel switches
The ACC system can apply the brakes to maintain the gap to the vehicle in front. The braking force which the system can apply is limited, but can be overridden by the driver braking. This action will cancel the cruise control function, but the system will "remember" the selected speed, and will resume the selected speed by the driver pressing the RESUME switch on the steering wheel switchpack
Note. When the system applies the brakes, the brake lights will function exactly as if the driver were braking.
It is possible (for example, when a slow-moving vehicle pulls out into the lane in front), for the degree of braking necessary to avoid a collision to exceed the maximum level of the ACC system. Should this happen, an audible warning will sound, accompanied by a red warning light and a DRIVER INTERVENE display on the message center, at which point, the driver must take action. This is not a fault , but a designed feature of the system.
Should the driver need to go faster than the selected speed, he/she can override the system simply by pressing the accelerator, in which case, the message center will display CRUISE OVERRIDE. When the pedal is released, the system will resume operation in whichever mode is appropriate, follow or selected speed.
There are two types of speed (cruise) control fitted, adaptive cruise control (ACC) and non-adaptive cruise control.
The non-adaptive system maintains a road speed selected by the driver from the steering wheel switches, and is cancelled by inputs from the steering wheel CANCEL switch, the brake pedal (the system will disengage if the brake pedal is pressed), road speed (the system will disengage if the road speed falls below 26 kph [16 mph]), gear selector position (the system will disengage if NEUTRAL, PARK or REVERSE gears are selected), traction or stability control (the system will disengage if the traction or stability control is activated).
The adaptive system also maintains a road speed selected by the driver from the steering wheel switches, and is cancelled by the same inputs (the only difference being that the stored set speed will show in the message center display), but can also maintain a selected gap from the vehicle in front.
The ACC system fitted to this vehicle varies from past ACC systems in that the forward looking radar (FLR) sensor is a separate component and not integrated into the ACC module.
When the system is enabled, the vehicle will maintain the selected speed until another vehicle is detected travelling in the same lane and direction, when it will enter FOLLOW MODE.
In this mode, the vehicle will maintain a time gap from the vehicle in front, rather than the selected speed. This is not a fault , but a designed feature of the system. The time gap is adjustable, using the HEADWAY switches on the steering wheel switch assembly, but will default to a longer gap, unless overridden by the driver.
When the vehicle enters FOLLOW MODE , the message center will display the ACC tell-tale symbol (see the owner's handbook), with a GAP indication for four seconds, and the vehicle will maintain the gap from the vehicle in front until
- the vehicle in front accelerates to a speed above the stored set speed, in which case the stored set speed will be resumed.
- the vehicle in front moves out of lane, or out of view, in which case the stored set speed will be resumed.
- the vehicle in front slows to below 26 km/h (16 mph), at which speed the system disengages, the message DRIVER INTERVENE will display on the message center accompanied by a chime, and any braking applied by the ACC system will be smoothly reduced. This is not a fault but may involve the driver having to take control and brake him/herself.
- a new gap distance is set by the driver from the steering wheel switches.
The ACC system can apply the brakes to maintain the gap to the vehicle in front. The braking force which the system can apply is limited, but can be overridden by the driver braking. This action will cancel the cruise control function, but the system will "remember" the stored set speed, and will resume the stored set speed by the driver pressing the RESUME switch on the steering wheel switch assembly.
Note. When the system applies the brakes, the brake lights will function exactly as if the driver were braking.
It is possible (for example, when a slow-moving vehicle pulls out into the lane in front), for the degree of braking necessary to avoid a collision to exceed the maximum level of the ACC system. Should this happen, an audible warning will sound, accompanied by a red warning light and a DRIVER INTERVENE display on the message center, at which point, the driver must take action. This is not a fault , but a designed feature of the system.
Should the driver need to go faster than the stored set speed, he/she can override the system simply by pressing the accelerator, in which case, the message center will display CRUISE OVERRIDE. When the pedal is released, the system will resume operation in whichever mode is appropriate, follow or selected speed.