Land Rover Discovery 99my To 03my Electrical Library 3rd Edition Rover Manual

DESCRIPTION AND OPERATION
4.60DISCOVERY SERIES II
EAT Operation
Gearbox solenoid valve block
The gearbox solenoid valve block is connected to the EAT ECU as follows:
zECU pin C0193-5 on an OG wire to gearbox solenoid pin C0543-H. This provides an 
output to the pressure regulator solenoid valve.
zECU pin C0193-43 on an R wire to connector interface C0728-2/C0678-2 and from the 
interface to the gearbox solenoid pin C0243-E on an OK wire. This receives a positive 
input from the gearbox output shaft speed...

DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.61
The starter/ inhibitor/ reverse light switch pin C0675-8 is connected on an NP wire to BCU 
pin C0663-10.
The starter/ inhibitor/ reverse light switch pin C0675-5 is connected on a BG wire, via splice 
joint A31 (and header C0294 LHD/C0287 RHD Td5 only), to BCU pin C0663-11.
On Td5 engine vehicles only, the starter/ inhibitor/ reverse light switch is connected from pin 
C0675-5, through splice joint A31, to connector interface C0681-10/C0668-10 on a BG...

DESCRIPTION AND OPERATION
4.62DISCOVERY SERIES II
Instrument pack
The instrument pack pin C0230-5 is connected on a YG wire to the EAT ECU pin C0193-51. 
This connection operates the manual mode lamp in the instrument pack.
The instrument pack pin C0230-4 is connected on a YR wire to the EAT ECU pin C0193-25. 
This connection operates the sport mode lamp in the instrument pack.
The instrument pack pin C0233-16 is connected on an SK wire, via header C0293 LHD/
C0292 RHD to the IDM in the passenger...

DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.63
ACTIVE CORNERING ENHANCEMENT (ACE)
DESCRIPTION
General
The ACE system is an optional fitment to control vehicle roll angles. The system is 
electrically and hydraulically operated with all operations controlled by an ACE ECU. The 
ACE system provides improved vehicle handling and suspension characteristics and is 
active for both on and off-road driving. Refer to the Workshop Manual for detailed description 
and operation of the ACE system.
OPERATION
ACE...

DESCRIPTION AND OPERATION
4.64DISCOVERY SERIES II
Road speed signal
The ACE ECU receives a road speed signal from pin C0504-3, via header C0290, to ACE 
ECU pin C0647-5 on a KG wire.
ACE ECU
The ACE ECU receives two earth connections on B wires from pins C0647-20 and C0647-
32 to earth header C0018 LHD/C0017 RHD.
ACE upper accelerometer
The ACE ECU provides a power supply output on a YR wire from ECU pin C0647-18 to the 
upper accelerometer pin C0657-3.
The ACE ECU receives an earth input from the upper...

DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.65
Pressure control valve
The ACE ECU provides a power output on a P wire from ECU pin C0647-27 to pressure 
control valve pin C0728-2.
The ACE ECU receives an earth input on a BG wire from ECU pin C0647-25 to the pressure 
control valve pin C0728-1
Directional control valves
The ACE ECU provides a power supply output on a GR wire from pin C0647-24 to the 
directional control valve 1 pin C0770-2 and directional control valve 2 pin C0771-2.
The ACE ECU...

DESCRIPTION AND OPERATION
4.66DISCOVERY SERIES II
SELF LEVELLING AND ANTI-LOCK BRAKING SYSTEM (SLABS)
DESCRIPTION
General
SLS and ABS is controlled by the Self Levelling and Anti-Lock Braking System (SLABS) 
ECU. The two systems are housed in the one ECU, but operate independently of each other.
The SLS system comprises an air supply unit comprising a compressor and air valves, two 
height sensors and the SLS part of the SLABS ECU. The SLS system controls the height of 
the rear suspension for off-road...

DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.67
Ignition switch supply
When the ignition switch is in position II, the feed from fusible link 8 flows through the ignition 
switch to the passenger compartment fusebox on a Y wire and passes through fuses 25, 27 
and 28.
From fuse 25 is connected to the contacts of the hill descent relay in the passenger 
compartment fusebox. The feed from fuse 25 is also connected on a GY wire to the reverse 
lamp switch (manual gearbox vehicles) or the starter...

DESCRIPTION AND OPERATION
4.68DISCOVERY SERIES II
SLS RH rear valve:
When RH rear valve operation is required, the SLABS ECU outputs a feed on pin C0655-4 
on a UO wire to the valve. The valve is connected on a B wire, via splice joint A47 to earth 
eyelet connector C0811-1.
Off-road mode switch
When the non-latching off-road mode switch is pressed, an earth path is completed from 
SLABS ECU pin C0655-11 on a PK wire, via splice joint A186, to the off-road mode switch. 
The switch is connected on a B...

DESCRIPTION AND OPERATION
DISCOVERY SERIES II 4.69
Tail door
The earth input for ECU pin C0655-2 is connected on a PLG wire to header C0291 LHD/
C0285 RHD. From the header a PLG wire connects to the tail door motor switch. The motor 
is connected on a B wire to earth header C0706.
Body Control Unit (BCU)
The SLABS ECU provides outputs and receives inputs to/from the BCU on connectors 
C0655 and C0504 as follows:
zAn output is passed from SLABS ECU pin C0655-7 to BCU pin C0660-10 on a WK 
wire. This...