Land Rover Freelander 2003my Electrical Library Rover Manual

DESCRIPTION AND OPERATION
4.66FREELANDER 03MY
ANTI-LOCK BRAKING SYSTEM (ABS)
DESCRIPTION
General
The ABS is a full time, four channel system that gives individual speed control to all four 
wheels to provide the vehicle with anti-lock braking (ABS), Electronic Traction Control 
(ETC), and Hill Descent Control (HDC). The systems are controlled by the ABS ECU, which 
is mounted on the rear of the ABS modulator. The ABS ECU also controls the front to rear 
brake balance by Electronic Braking force...

DESCRIPTION AND OPERATION
FREELANDER 03MY 4.67
Fuse 2 of the passenger compartment fuse box (C0580) provides an ignition feed to the 
brake pedal switch (C0075) and the HDC relay (C0574) on G wires. Fuse 35 (C0580) 
provides an ignition feed to the hill descent switch (C0365 on manual transmission vehicles, 
C0878 on automatic transmission vehicles), and the hill descent relay (C0571) on W wires. 
Fuse 7 (C0582) provides an ignition feed to the ABS ECU (C0501) on a W wire.
Wheel Speed Sensors
The ABS ECU...

DESCRIPTION AND OPERATION
4.68FREELANDER 03MY
KV6
The ABS ECU (C0501) provides a road wheel speed signal to the EAT ECU (C0932) via the 
CAN BUS on YN (low) and YB (high) wires. This information is relayed to the ECM (C0371) 
via the CAN BUS on YN (low) and YB (high) wires.
For more information on the CAN BUS, refer to the  Communication Databuses  section 
of the System Description and Operation Workshop manual.
The ABS ECU (C0501) also provides a pulsed road speed signal to the CCU (C0428) on a 
WO...

DESCRIPTION AND OPERATION
FREELANDER 03MY 4.69
Brake Fluid Level Switch
The ABS ECU (C0501) provides a feed to the brake fluid level switch (C0026) on a BW wire. 
The switch is closed when the correct amount of brake fluid is present in the brake fluid 
reservoir. The switch (C0026) is earthed on a B wire. If the brake fluid level drops below the 
recommended level, the switch contacts open. When the ABS ECU registers the switch 
opening, it informs the instrument pack to illuminate the brake fluid...

DESCRIPTION AND OPERATION
4.70FREELANDER 03MY
HDC Relay
The HDC relay (C0575) is located in the engine compartment fuse box, and is controlled by 
the ABS ECU (C0501) on a BR wire. When energised, the HDC relay (C0570) provides a 
feed to the following on GP wires:
zThe ABS ECU (C0501).
zThe LH brake lamp (C0121).
zThe RH brake lamp (C0125).
zThe CHMSL (C0613).
Diagnostic Socket
The diagnostic socket (C0040) is connected to the ABS ECU (C0501) by a K wire, enabling 
the ABS ECU to be interrogated by...

DESCRIPTION AND OPERATION
FREELANDER 03MY 4.71
SUPPLEMENTARY RESTRAINT SYSTEM (SRS)
DESCRIPTION
General
The Supplementary Restraint System (SRS) is designed to work in conjunction with the 
vehicle seat belts. The main components of the system are:
zDriver Airbag – Mounted in the steering wheel to provide added protection for the driver 
during a frontal impact.
zPassenger airbag – Mounted in the fascia to provide added protection for the front seat 
passenger during a frontal impact.
zSeat Belt...

DESCRIPTION AND OPERATION
4.72FREELANDER 03MY
Driver Airbag
The airbag DCU (C0256) controls the feed to the driver airbag (C0545) via the rotary coupler 
(C0374) on a Y wire. The airbag DCU (C0256) controls the earth path for the driver airbag 
(C0545) via the rotary coupler (C0374) on an R wire.
Passenger Airbag
The airbag DCU (C0256) controls the feed to the passenger airbag (C0433) on a W wire. 
The earth path for the passenger airbag (C0433) is controlled by the airbag DCU (C0256) 
on a U wire.
Seat...

DESCRIPTION AND OPERATION
FREELANDER 03MY 4.73
AIR CONDITIONING (A/C) – Td4
DESCRIPTION
General
The air conditioning (A/C) system will only operate when the engine is running. The A/C 
system is switched on and off by pressing the switch mounted on the centre console. When 
the switch is pressed, an LED mounted within the switch illuminates to inform the driver the 
system is operational. For more information on LED operation, refer to the  Interior 
Illumination  section of this manual.
 
+  INTERIOR...

DESCRIPTION AND OPERATION
4.74FREELANDER 03MY
Fusible link 1 is connected in series with fusible link 2, fuse 8, and fuse 9 which are also 
located in the engine compartment fuse box. Fuse 8 (C0576) provides a constant battery 
feed to the heater blower relay (C0153) on a GN then GW wire. Fuse 9 provides a constant 
battery feed to the compressor clutch relay, which is also located in the engine compartment 
fuse box.
Fusible link 2 (C0571) is connected to the ignition switch (C0028) by an NR wire. When...

DESCRIPTION AND OPERATION
FREELANDER 03MY 4.75
Instrument Pack
The instrument pack (C0230) acts as a gateway, relaying CAN messages to and from 
different components throughout the vehicle as follows:
Pressure Sensor
The pressure sensor is located in the high pressure A/C line adjacent the compressor, and 
replaces the more traditional trinary pressure switch. The instrument pack (C0230) provides 
a 5 V reference voltage to the pressure sensor (C1257) on a UO wire. The pressure sensor 
(C1257) is...