Operating Modes

Operating modes





Before it will be possible to verify the customer concern, it will be necessary to understand the modes of the system to establish what the system should and should not do in each mode. The table should help in understanding the operating modes.

TRANSPORTATION MODE
The vehicle will arrive at the dealership in transportation mode, and will need to be reset to customer mode at PDI (this will be carded out by a Jaguar dealer).

Transportation mode keeps the vehicle in a raised condition to allow adequate clearance for transporter loading and unloading. if the vehicle has lowered, the compressor is used to lift the vehicle. Until a suitable height is reached, the message center will display Vehicle too low. The message, Air Suspension Fault will be displayed on the message center at all times whilst the vehicle is in transportation mode.

CUSTOMER MODE
The modes below are all enabled in this mode.

SLEEP MODE
The system shuts down into sleep mode 30 minutes after the vehicle is left and 'wakes up' to check the ride height every 24 hours. if the vehicle is not level, the system lowers until the vehicle attitude is correct. The system will not lift the vehicle while in sleep mode to conserve reservoir pressure and battery power.

PRELIMINARY MODE
When a door or luggage compartment is opened, or the engine is switched off from a standstill condition, (see below) this mode is enabled.

In Preliminary mode, the reservoir is used to lift the vehicle to level it to within a greater tolerance than in stance or drive modes (see below).

STANCE MODE
When the vehicle is stationary with the engine running, (standstill condition) the vehicle will be levelled to within a closer tolerance than in preliminary mode to ensure that the trim heights are correct before moving off.

Any lifting necessary will be done from the reservoir, unless the vehicle is below a preset minimum height and the reservoir pressure is below a preset minimum, in which case, the compressor be will used to lift the vehicle.

DRIVE MODE
When the vehicle speed is above the preset threshold, the compressor is always used to lift the vehicle. This threshold is also used to initiate recharging of the reservoir. The following functions are enabled in drive mode;

Speed Lowering Function
To reduce aerodynamic drag and enhance vehicle stability, the system lowers the vehicle at high road speeds.

Levelling inhibit Function
When the system detects significant comering, braking and acceleration, it inhibits levelling such that it will not attempt to compensate for vehicle attitude changes.

Inclination Function
The system enables this function when parking on an uneven surface, (or with a wheel on a curb, for example) to ensure the vehicle attitude remains correct when driving off.

Rough Road Detection
When the system detects a rough road surface, the speed lowering function is inhibited, or cancelled, bringing the vehicle back up to standard ride height to aid passenger comfort

Trailer Towing Function
When the system detects that the vehicle is towing, (via the connection of the trailer socket) the speed lowering function is inhibited.

NOTE: This function will only be enabled via the Jaguar approved towing equipment

Jacking Function
When the system detects that the vehicle is being jacked, or raised on a wheel-free lift, the vehicle enters jacking mode, which inhibits lowering to prevent air loss.
Jacking mode is exited when the vehicle is driven, or the ride height passes below a threshold value.