Range Rover (LM) V8-4.4L (2009)
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An HDC switch.
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A stoplamp switch.
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Four wheel speed sensors.
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A yaw rate and lateral acceleration sensor.
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A steering angle sensor.
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Four warning indicators.
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A HCU (hydraulic control unit) with attached ABS (anti-lock brake system) module.
DSC SWITCH
The DSC switch allows the DSC function to be selected off. Although Land Rover recommend that DSC is selected on for all normal driving
conditions, it may be beneficial to de-select DSC, to maximize traction, under the following conditions:
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If the vehicle needs to be rocked out of a hollow or a soft surface.
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Driving on loose surfaces or with snow chains.
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Driving in deep sand, snow or mud.
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On tracks with deep longitudinal ruts.
The DSC switch is a non-latching switch installed in the center switch pack on the instrument panel. Pressing the DSC switch connects an ignition
power feed to the ABS (anti-lock brake system) module. With the first press of the DSC switch, the ABS (anti-lock brake system) module disables the
DSC functions. When the DSC switch is pressed again, the ABS (anti-lock brake system) module re-enables the DSC functions. The DSC switch must
be pressed for a minimum of 0.3 s for the ABS (anti-lock brake system) module to react. The DSC function is re-enabled at the beginning of each
ignition cycle.
The status of the DSC switch selection is shown by the DSC warning indicator. The DSC warning indicator is off while DSC is selected on, and
continuously illuminated while DSC is selected off.
A DSC switch request to disable DSC is ignored by the ABS (anti-lock brake system) module if the air suspension system has failed, or is in off-road
height at speeds above 60 km/h (37.5 mph).
To guard against incorrect operation or a broken switch, if the input from the DSC switch is held high for more than one minute, a failure is stored in
the ABS (anti-lock brake system) module.
Even if DSC is deselected, driving maneuvers with extreme yaw or lateral acceleration may trigger DSC activity to assist vehicle stability.
HDC SWITCH
