Ride Height Tolerance Control

The Chassis Control Module (CHCM) has two ride height tolerance bands: normal tolerance and tight tolerance.

The CHCM considers the vehicle to be at target height if the current height is within the appropriate tolerance band. Height adjustments are not made until the vehicle height falls outside of the tolerance band for a pre-determined time. The time period is different depending on whether the vehicle is moving or stationary.

The tolerance bands are as follows:

• Normal ± 9 mm
• Tight ± 3 mm.

The tight tolerance band is only used in the following conditions:

• If set by the Jaguar Land Rover approved diagnostic system for diagnostic purposes.
• When the vehicle has been stationary for more than 15 minutes.

The tight tolerance band will also be activated by the following procedure:

1. Start the engine.
2. Set the suspension to normal height.
3. Open the driver's door.
4. Depress the brake pedal lightly three times in quick succession.
5. Close the driver's door within 10 seconds of the first brake pedal depress.

If the procedure has been successful the instrument pack will emit two soft chimes about one second after the driver's door is closed. Thereafter the instrument pack will emit two soft chimes each time the driver's door is closed to confirm that tight tolerance mode is still active.

This tight tolerance mode will be cancelled when the engine is turned off or the vehicle speed exceeds 8 km/h (5 mph).