Dynamic Response Control Module: Notes
The Dynamic Response control module is located on the driver's side 'A' pillar, behind the instrument panel. The control module is secured to the vehicle body with two screws. Two connectors are located on the rear face of the control module and allow for the connection of the harness connectors. The two connectors supply power, ground, signal and sensor information to and from the control module for control of the Dynamic Response system.
On vehicles from 2007MY, the Dynamic Response control module contains 2 tunes; One for TdV6 and V8 petrol models and one for TdV8 models. When a replacement control module is fitted, the correct tune is selected from the data contained within the Car Configuration File (CCF) retained in the instrument cluster.
The Dynamic Response control module receives a power supply from the main relay via fuse 9E in the Battery Junction Box (BJB).
An engine speed signal is transmitted to the control module from the Engine Control Module (ECM) via the high speed Controller Area Network (CAN) bus. The engine speed signal is used by the Dynamic Response control module to detect that the engine is running and hydraulic pressure for the Dynamic Response system is available.
A road speed signal is transmitted to the control module from the ABS module on the high speed CAN. A steering angle signal is transmitted on the high speed CAN bus from the steering angle sensor. The Dynamic Response control module uses the road speed and steering angle signals to calculate lateral acceleration and for on and off-road roll compensation.
When reverse gear is selected and reverse wheel rotation is transmitted on the high speed CAN bus, the Dynamic Response system reverts to a 'locked bars' condition. This condition is maintained until reverse gear is deselected and a forward wheel rotation message is transmitted on the CAN bus.
The Dynamic Response control module receives an ignition on signal on the high speed CAN bus. The ignition signal provides an input into the control module to inform the control module that the ignition switch is in position II. The control module initiates a 250 ms start time which is used to prevent functions operating when the software routines are being initialized.
When the ignition on CAN signal is removed, the control module senses that the ignition has been switched off. The control module remains powered for a 30 second period to allow fault information and adaptive values to be stored in the memory. The values and fault information are read by the control module when the ignition is next switched on. The power supply to the control module is maintained for as long as the main relay remains energized.
The Dynamic Response control module is connected on the high speed CAN bus to the diagnostic socket which allows diagnostic interrogation of the control module. The diagnostic socket allows for the connection of a Land Rover approved diagnostic system to read any stored fault codes in the control module. The control module can also be updated with revised software using a Land Rover approved diagnostic system should a software update be required.
When system faults are detected, the control module issues a message on the CAN bus which is received by the instrument cluster. The instrument cluster then illuminates the air suspension/Dynamic Response warning indicator as follows:
- Minor faults - warning indicator illuminated in an amber color with an applicable message in the message center
- Major faults - warning indicator illuminated in a flashing red color with an applicable message in the message center and an audible warning. The message will instruct the driver to stop the vehicle immediately or drive with caution.
Two messages relating to Dynamic Response are displayed in the instrument cluster message center:
- SUSPENSION FAULT, VEHICLE LEAN, WHEN CORNERING
- SUSPENSION FAULT, STOP SAFELY, STOP ENGINE.
The Dynamic Response control module supplies a control current to the Pressure Control Valve (PCV) in the valve block. The current supplied is determined by a number of input signals from the upper and lower accelerometers, road speed, steering angle etc.. The PCV controls the hydraulic pressure supplied to the actuators proportional to the current supplied by the control module.
Power is supplied to the two solenoid operated Directional Control Valves (DCV) in the valve block by the control module. Together, the two DCV's control the direction of flow of hydraulic fluid to the actuators. When the control module supplies power to the solenoids the valves open allowing hydraulic fluid to flow to the actuators. When power is removed, the DCV's close. DCV1 is left open for left hand corners and DCV2 is opened for right hand corners.
The pressure transducer located in the valve block receives a 5V current from the control module. The transducer measures the hydraulic pressures in the range of 0 to 180 bar (0 to 2610 lbf/in2 ) and returns a linear output voltage to the control module dependant on the hydraulic pressure.
The Dynamic Response control module supplies a 5V current to each of the accelerometers. Each accelerometer is capable of measuring lateral acceleration in the range of ± 1.11 g. An analogue input to the control module of between 0.5 and 4.5V relative to the lateral acceleration sensed is returned by each accelerometer. The control module processes the two signals received, together with the steering angle and vehicle speed signals, to produce a 'pure' lateral acceleration signal which is then used as the main control signal for the Dynamic Response system.