Land Rover Defender: Component Location, Overview

COMPONENT LOCATION

COMPONENT LOCATION 1 OF 2 - MODEL 110 VEHICLES

1. Rear left height sensor
2. Chassis Control Module (CHCM)
3. Interactive Control Interface Module 'A' (ICIMA)
4. Interactive Display Module 'A' (IDMA)
5. Front left air spring and damper
6. Front left height sensor
7. Front accelerometer (quantity 2)
8. Front right height sensor
9. Front right air spring and damper
10. Front valve block
11. Air reservoir
12. Rear valve block
13. Rear right height sensor
14. Rear right air spring
15. Suspension air supply unit
16. Rear left air spring
17. Rear accelerometer
18. Air suspension rear switchpack (Luggage compartment)

COMPONENT LOCATION 2 OF 2 - MODEL 90 VEHICLES

1. Rear left height sensor
2. CHCM
3. Air reservoir
4. ICIMA
5. IDMA
6. Front left air spring and damper
7. Front left height sensor
8. Front accelerometer (quantity 2)
9. Front right height sensor
10. Front right air spring and damper
11. Front valve block
12. Air reservoir
13. Rear valve block
14. Rear right height sensor
15. Rear right air spring
16. Suspension air supply unit
17. Rear left air spring
18. Rear accelerometer
19. Air suspension rear switchpack (Luggage compartment)

OVERVIEW

ADAPTIVE DAMPING

Adaptive Damping (AD) is an electronically controlled suspension system that continuously adjusts the damping characteristics of the suspension shock absorbers in reaction to the existing driving conditions.

The system is controlled by the CHCM.

The CHCM receives signals from 3 accelerometers, 4 height sensors and other vehicle systems to determine:

• Vehicle state
• Body and wheel motions
• Driver inputs.

These signals are used by the CHCM to continuously control the damping characteristics of each shock absorber to the appropriate level to provide the optimum body control and vehicle ride.

AIR SUSPENSION SYSTEM

The air suspension system is a 4 corner system, electronically controlled by the CHCM. The CHCM receives input signals from 4 height sensors. The CHCM operates a suspension air supply unit and 2 valve blocks.

The air suspension system maintains the vehicle height under all operating conditions by controlling the mass of air in the air springs. The CHCM uses signals from the 4 height sensors to maintain the correct suspension height, irrespective of vehicle load. Additionally, the system allows the driver to request ride height changes to improve offroad performance or ease of access or loading. This is achieved by the CHCM operating the pneumatic control valves to increase or decrease the mass of air in the air springs.

The air suspension system has 4 driver selectable, pre-determined ride-height states. A driver interface indicates the selected ride state and height change movement. Additional information is also relayed to the driver through the instrument cluster message center and by audible warnings also transmitted by the Instrument Panel Cluster (IPC).

The air suspension can be controlled manually by the driver using the ICIMA to select the required height change.

For safety reasons, the lowering of the suspension is restricted when a door is open. Full suspension lowering may not be achievable until the door is closed.

The system temporarily inhibits height adjustments when the vehicle is subject to cornering, heavy acceleration or heavy braking. The inhibit function prevents unsettling of the vehicle.

The CHCM performs On-Board Diagnostics (OBD) functions to perform 'health checks' on the system. If faults are detected, codes are stored in the control module and can be retrieved using a Jaguar Land Rover (JLR) approved diagnostic system.

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