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

DESCRIPTION AND OPERATION
4.56RANGE ROVER
AUTOMATIC TEMPERATURE CONTROL (ATC) – COMFORT
DESCRIPTION
General
The Comfort Automatic Temperature Control (ATC) system is controlled by the ATC ECU, 
which is located behind the centre console. In addition to the features included on the low 
line system, the Comfort ATC system also features a second coolant valve, a pollution 
sensor, and a rear blower unit. 
The Comfort ATC system is fully automatic, with separate temperature settings for the LH 
and RH sides...

DESCRIPTION AND OPERATION
RANGE ROVER 4.57
Fuse 53 (C0583) is connected to the ignition switch (C0099 on Td6 vehicles, C0028 on V8 
vehicles) by an R wire. When the ignition switch is turned to the ignition position, current 
flows across the switch (C0099 on Td6 vehicles, C0028 on V8 vehicles) to fuse 34 and fuse 
2 of the passenger compartment fuse box (C0585) on a G wire. Fuse 34 (C0587) provides 
an ignition feed to the ATC ECU (C1629) on a GY wire.
Fuse 2 (C0587) provides an ignition feed to the...

DESCRIPTION AND OPERATION
4.58RANGE ROVER
Sunlight Sensor
The sunlight sensor consists of a LH and a RH photoelectric cell that provide the ATC ECU 
with inputs of light intensity. These are used by the ATC to adjust blower speed, 
temperature, and air distribution. The ATC ECU (C1629) provides a feed to the sunlight 
sensor (C0790) on a YB wire. The LH photoelectric cell (C0790) returns a signal back to the 
ATC ECU (C1629) on a YR wire. The RH photoelectric cell (C0790) returns a signal back to 
the...

DESCRIPTION AND OPERATION
RANGE ROVER 4.59
Air Distribution Motors
Unless manually overridden, operation of the air distribution motor is controlled 
automatically by the ATC ECU. The ATC ECU (C2295) provides a feed to the following on 
BW wires:

The face level air distribution motor (C2133).

The screen air distribution motor (C2134). 

The footwell air distribution motor (C2135).
 The ATC ECU (C2295) provides an earth path for all three motors on B wires.
Air Recirculation Motor
Unless manually...

DESCRIPTION AND OPERATION
4.60RANGE ROVER
Cooling Fan
Operation of the cooling fan is controlled by the ECM. When the compressor is engaged, the 
ATC ECU (C1629) informs the ECM (C0331) via the K bus on a WRY wire that cooling fan 
operation is required. The ATC ECU also informs the ECM of the speed at which the fan 
should be driven. 
The ECM also monitors Engine Coolant Temperature (ECT) to determine fan speed. The 
ECM (C0606) provides a feed to the ECT sensor (C0169) on an SU (Td6) or YG (V8) wire....

DESCRIPTION AND OPERATION
RANGE ROVER 4.61
FUEL BURNING HEATER – Td6
DESCRIPTION
General
The Fuel Burning Heater (FBH) is mounted in the rear of the engine compartment on the 
passengers side, and is fitted as standard on Td6 vehicles. The FBH is an additional heater 
installed in the heater coolant circuit. The FBH can be operated without the engine running 
to pre-heat the passenger compartment and after the engine starts to reduce heater coolant 
warm-up time. The FBH also boosts the heater coolant...

DESCRIPTION AND OPERATION
4.62RANGE ROVER
FUEL BURNING HEATER – V8
DESCRIPTION
General
The Fuel Burning Heater (FBH) is mounted in the rear of the engine compartment on the 
passengers side, and is fitted as an option on V8 vehicles. The FBH is an additional heater 
installed in the heater coolant circuit. The FBH can be operated without the engine running 
to pre-heat the passenger compartment and after the engine starts to reduce heater coolant 
warm-up time. The FBH also boosts the heater coolant...

DESCRIPTION AND OPERATION
RANGE ROVER 4.63
K Bus
The instrument pack (C0233) communicates with the Air Temperature Control (ATC) ECU 
(C1629) and the FBH (C0926) via the K-bus on a WRY wire to initiate FBH operation. For a 
detailed description of the parameters for operation, and the messages sent via the K bus, 
refer to the  Air Conditioning  section of the System Description and Operation Workshop 
manual. 

DESCRIPTION AND OPERATION
4.64RANGE ROVER
COOLING FAN
DESCRIPTION
General
The electrically powered cooling fan is mounted on the front of the radiator and works in 
conjunction with the cooling fan mounted on the front of the engine. Operation of the cooling 
fan is controlled by the Engine Control Module (ECM). The ECM determines cooling fan 
operating strategy after receiving inputs of Engine Coolant Temperature (ECT) from the 
ECT sensor, and requests for extra engine cooling from the Automatic...

DESCRIPTION AND OPERATION
RANGE ROVER 4.65
When the ATC ECU engages the A/C compressor clutch, the ATC ECU (C1629) informs the 
ECM (C0331) via the K bus on a WRY wire that cooling fan operation is required. The ATC 
ECU also informs the ECM of the speed to drive the motor. For more information on A/C 
operation, refer to the  Automatic Temperature Control (ATC)  or  Automatic 
Temperature Control (ATC) – Comfort  section of this manual.
 
+  AUTOMATIC TEMPERATURE CONTROL (ATC). 
 
+  AUTOMATIC...