Land Rover Range Rover Electrical Library Lm 2nd Edition Rover Manual

DESCRIPTION AND OPERATION
4.46RANGE ROVER
ANTI-LOCK BRAKING SYSTEM (ABS)
DESCRIPTION
General
New Range Rover is equipped with Dynamic Stability Control (DSC) for enhanced braking 
and stability control. Functions of the DSC include:

Hill Decent Control (HDC).

Electronic traction control (ETC).

Anti-lock Braking System (ABS).
The DSC system for New Range Rover provides all of the following functions and features:

Optimised traction under all driving conditions.

Optimised directional control...

DESCRIPTION AND OPERATION
RANGE ROVER 4.47
V8
Fusible link 2 (C0632) provides a constant battery feed to the ECM relay (C1895) on an R 
wire. Operation of the ECM relay (C1895) is controlled by the ECM (C0604) on an N wire. 
The energised ECM relay (C1895) provides a feed to fuse 51 of the passenger compartment 
fuse box (C0584) on an RW wire. Fuse 51 (C0584) is connected to the ABS ECU (C0506) 
and the steering angle sensor (C0862) by a pair of RW wires.
Td6
The 100A fuse within the fuse holder (C1878)...

DESCRIPTION AND OPERATION
4.48RANGE ROVER
Steering Angle Sensor
The steering angle sensor (C0862) receives a constant battery feed from fuse 13 of the 
passenger compartment fuse box (C0586) on an RG wire, and a feed from the energised 
ECM relay (C1895) via fuse 51 of the passenger compartment fuse box (C0584) on an RW 
wire. The sensor (C0862) is earthed on an NB wire.
The steering angle sensor (C0862) transmits steering angle and rate of steering messages 
via the Can bus on YN (low) and YB (high)...

DESCRIPTION AND OPERATION
RANGE ROVER 4.49
SUPPLEMENTARY RESTRAINT SYSTEM (SRS)
DESCRIPTION
General
The Supplementary Restraint System (SRS) is controlled by the SRS Diagnostic Control 
Unit (DCU) which is mounted on the transmission tunnel, to the rear of the gear selector 
lever. The SRS DCU registers front and rear impacts via an integral accelerometer. Side 
impacts are registered via two side impact sensors; one mounted on the base of the RH B/
C post, one mounted on the base of the LH B/C post.
The...

DESCRIPTION AND OPERATION
4.50RANGE ROVER
Drivers Airbag
The drivers airbag can deploy in one of two stages, depending upon the severity of impact. 
If a less severe impact is detected, stage 1 deployment is carried out. The SRS DCU 
(C0256) provides a firing signal to the drivers airbag (C1254) via the rotary coupler (C0082) 
on a YB then S wire. The SRS DCU (C0256) provides an earth path for the drivers airbag 
(C1254) via the rotary coupler (C0082) on an LG then YN wire.
A split second later, the SRS...

DESCRIPTION AND OPERATION
RANGE ROVER 4.51
Head Airbags
The SRS DCU registers a side impact via the side impact sensors, which are mounted at 
the base of the LH and RH B/C posts. The SRS DCU monitors the condition of the RH 
sensor (C0951) and the LH sensor (C0950) on YR and YG wires respectively. Both sensors 
are earthed on NB wires. When the SRS DCU registers a side impact above its threshold 
level, it will fire the relevant head airbag.
LH Front
The SRS DCU (C0256) provides a firing signal to the...

DESCRIPTION AND OPERATION
4.52RANGE ROVER
Seat Belt Pre-tensioners
If the SRS DCU detects a front or rear impact, it will deploy the front seat belt pre-tensioners. 
The SRS DCU (C0256) provides a firing signal to the RH seat belt pre-tensioner (C0252) on 
a UN wire. An earth path is provided by the SRS DCU (C0256) on a UR wire. The SRS DCU 
(C0256) provides a firing signal to the LH seat belt pre-tensioner (C0254) on a YR wire. An 
earth path is provided by the SRS DCU (C0256) on a YN wire.
Battery...

DESCRIPTION AND OPERATION
RANGE ROVER 4.53
AUTOMATIC TEMPERATURE CONTROL (ATC)
DESCRIPTION
General
The Automatic Temperature Control (ATC) system is controlled by the ATC ECU, which is 
located behind the centre console. ATC features automatic control of a common 
temperature setting for both sides of the passenger compartment, with manual control of the 
blower speed, air recirculation, and air distribution.
A Fuel Burning Heater (FBH) is fitted as standard on Td6 vehicles, and as an option on V8...

DESCRIPTION AND OPERATION
4.54RANGE ROVER
Compressor
When compressor operation is required, the ATC ECU (C1629) sends a message to the 
Engine Control Module (ECM) via the K bus on a WRY wire. Provided there are no engine 
management constraints, the ECM (C0331) responds by increasing throttle angle and 
fuelling and returns a signal granting operation of the compressor to the ATC ECU (C1629) 
on a BG wire. The ATC ECU (C1630) then provides a feed to the compressor clutch (C0182) 
on a BS wire.
For more...

DESCRIPTION AND OPERATION
RANGE ROVER 4.55
Coolant Valve
A single coolant valve is fitted on the ATC system to control coolant flow to the heater matrix. 
The coolant valve (C2034) is controlled by a Pulse Width Modulated (PWM) signal from the 
ATC ECU (C1629) on a YN wire.
Auxiliary Coolant Pump
The auxiliary coolant pump is used to ensure a satisfactory flow rate through the heater 
matrix at low engine speeds. The ATC ECU (C1629) provides a feed to the pump (C2035) 
on a UG wire. The pump (C2035) is...