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.
YAW RATE AND LATERAL ACCELERATION SENSOR
Located under the center console, the yaw rate and lateral acceleration sensor provides two inputs to the ABS (anti-lock brake system) module, lateral
acceleration and yaw rate, for DSC regulation. The sensor is isolated from body/chassis vibrations through its rubber mounting and secured to the
transmission tunnel with 2 bolts.
When the ignition switch is in position 11, the yaw rate and lateral acceleration sensor receives an ignition power feed from the CJB (central junction
box). For yaw rate, the sensor produces a reference signal of 2.5 volts and a linear yaw rate signal from 0.7 to 4.3 volts. For lateral acceleration, the
sensor produces a linear signal from 0.5 to 4.5 volts. In addition to using the inputs for DSC regulation, the ABS (anti-lock brake system) module also
broadcasts yaw rate and lateral acceleration values, on the high speed CAN (controller area network) bus, for use by other systems.
The ABS (anti-lock brake system) module monitors the yaw rate and lateral acceleration sensor for faults and can be interrogated using T4. If a fault is
detected the ABS (anti-lock brake system) module stores a related fault code and sends a CAN (controller area network) signal to the instrument
cluster to illuminate the DSC HDC and brake warning indicators. The instrument cluster also sounds a warning chime and displays a DSC fault
message in the message center.
