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Land Rover Range Rover Etm 1995 4th Edition Rover Manual

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    							HEATING AND VENTILATION (WITH A/C)K4
CIRCUIT OPERATION1
CIRCUIT OPERATION
Ignition position 1 (Accessories)
This feed is obtained from the BeCM via fuse 8 and
is shared with the Radio, Front cigar lighter, Aerial
amplifier and car phone (if fitted). The Ignition 1 is
essential to the control panel as it provides power to
the ECU although no functions or display on the LCD
are possible.
Ignition position 2
This feed is obtained from the BeCM via fuse 17.
Battery feed
This feed is obtained from the fuse box via fuse 42.
Ground Connection
This feed runs down to a spliced joint, joining the
main earth run down to fascia earth point 1.
Dimmer Line
This Pulse Width Modulated signal is provided by the
BeCM.
LCD Dimmer line
This line is a input to the HEVAC and the signal is a
inverse Pulse Width Modulated signal which is
determined by the instrument pack.
Compressor Clutch
The clutch line provides a 12 volt power feed to the
compressor clutch via pressure switch 1.
Condenser Fans
The HEVAC panel provides a signal normally at 12
volts for ªoffº condition and 0 volts for the ªonº
condition, which in the case of petrol vehicles is fed
into the ECM and diesel vehicles directly onto the
coil of relay 18. In line is the Air±Conditioning
pressure switch 2, which turns the fans on/off.
When relay 18 is energised, it provides connection
between relays 13 and 14 (fan 1 and 2) in series or
parallel with each other. This is dependent upon the
state of the air±conditioning pressure switch 1.
For the petrol option, when the signal enters the
ECM, the ECM will switch the output on/off to the
fusebox. The ECM will switch the output on
sometimes for engine cooling reasons even though
the engine has been turned off.
Aspirator
There are two parts of this sensor, one of which is a
fan which draws cabin air onto the temperature
sensor. The temperature sensor then sends the
signal back to the HEVAC ECU.Ambient Sensor
This sensor measures the temperature of the
external air flow into the vehicle.
Heater Core Sensor
This sensor measures the engine coolant
temperature within the fascia area.
Evaporator Sensor
This sensor is located within the evaporator unit and,
by providing feedback to the HEVAC ECU, prevents
it from freezing.
Alternator Charge signal
This signal is given to the HEVAC ECU to inform it
that the engine is running. This signal is active low.
Diagnostic K line
This line is used to communicate with the diagnostic
equipment (TESTBOOK) and is normally held at 12V
when not active.
Road Speed
This signal is fed into the HEVAC ECU.
Solar Sensor
This sensor provides the HEVAC ECU with the
power of the suns solar load and allows the system
to compensate accordingly.
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    							HEATING AND VENTILATION (WITH A/C)K4
CIRCUIT OPERATION2
A/C Request
This signal is active low and sends a request to the
ECM to switch on the air±conditioning system.
A/C Grant
This signal is active low and sends a signal to the
HEVAC ECU to acknowledge the request signal and
that it is ready for the load to be switched on by the
HEVAC system.
Pressure switch 1 (Trinary switch)
This switch is in parallel with two components, the
condensor fans and the compressor clutch which are
both normally short circuit. If the pressure is too high
or too low, the switch will open and cut the feed to
the clutch to prevent damage to the system. With the
third setting, at a specific pressure the switch is
shorted and changes the condenser fan mode from
series to parallel.
Pressure switch 2 (Single switch)
The switch is normally open circuit. At a specific
pressure, the switch is shorted and allows the
condenser fans to turn on.
Left/Right Recirculation motors
These motors control the flaps on the blower motor
modules. The flaps should be in one of two
positions, either fully open or fully closed.
Left/Right Blower modules
The blowers have a permanent 12V feed to them.
The speed of the motors is determined by the control
lines which go to the motors. The motors also
provide a voltage feedback to the HEVAC ECU to
determine the actual voltage at the motors but also
to show if there are any faults.
Left/Right Blend and Distribution Motors
These motors are controlled by the HEVAC ECU
which provides power to the motors, which in turn
report back their actual positions to the HEVAC
ECU.
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    							HEATING AND VENTILATION (WITH A/C)K4
3CIRCUIT DIAGRAM
3
C106
NY
C506
25
C121 C571
15 C114 Petrol DieselZ106
Generator
S573Starting and
Charging D +
68
15
F 17
10 A30
F 8
30 AZ238
Body Electrical
Control Module
(BECM)
RL7
17C255C2589
Z111
Radio S212
7 C226
WK W
S211
See Fuse Details LGR KR
Z253
Heating Ventila-
tion and Air
Conditioning
Control Unit
(HEVAC)
31
C244
4 C244
S208
E252
67 C246B
Data Link Con-
nector
LGR KR
15
C2317
S213
S214
X127
Data Link Con-
nectors
2
PN
30
F 42
10 A
8 C172
4
C202 C102
PNP125a
Engine Compart-
ment Fuse Box
B
See Ground Dis-
tribution
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    							HEATING AND VENTILATION (WITH A/C)K4
4CIRCUIT DIAGRAM
Z238
Body Electrical
Control Module
(BECM)
C2582
RW
6 C244
PG
5 C244
10C102
C202
Z253
Heating Ventila-
tion and Air
Conditioning
Control Unit
(HEVAC)
Heated Front
Screen
01010101010101
AUTO
PROG
0101010101
1 0
11 0
1
C246B11
O
C24220
Z142
Instrument
Cluster
[15] Control Unit
and Message
Centre Dis-
play [15] LCDLCD
15
BP
20
6
BR
19
11
WB
17
10
Y
5
9
NY
8
C255
Interior Lamps
S210
S209
01
A/C
OFF
Z108
Anti±Lock Brake Sys-
tem ECU
C116R28
11 C114YG C116LLHD
RHD
C246B
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    							HEATING AND VENTILATION (WITH A/C)K4
5CIRCUIT DIAGRAM
30
F 34
25 A
RL7
[7]
3 1
25
30
F 43
25 A
RL6
[6]
3 1
1 C172
WLG
2C201 C101
B
K4-6
4C174
WP
1
A
K4-6
S215
E252
See Ground Dis-
tributionB 3 C238
4C238
0III
III
X134
Ignition SwitchP125a
Engine Compart-
ment Fuse Box
[6] Auxiliary
Power 1
Relay
[7] Auxiliary
Power 2
Relay
3
WLG
8C112
13 C256Z238
Body Electrical
Control Module
(BECM)
WK
25
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    							HEATING AND VENTILATION (WITH A/C)K4
6CIRCUIT DIAGRAM
C2456
11
1 C2483
M
WR BR
C245
12
M160
Left Recirculating
Motor
9
1 C2513
M
WG BG
10
M161
Right Recirculat-
ing Motor
M
M158
Left Blower
Motor C203
1
RLG
3
RYK4-5
4
A
R
45
E253 C203
2
BWP
C203
1 C206
B
M
M159
Right Blower
Motor C240
1
GLG
3
GYK4-5
4
B
G
C240
2WLG
C240
1 C239
B
312
RLRL
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    							HEATING AND VENTILATION (WITH A/C)K4
7CIRCUIT DIAGRAM
C261Z253
Heating Ventila-
tion and Air
Conditioning
Control Unit
(HEVAC)4
S
2
RB
15
W
16
N
6
B
1
S
5
RB
7
W
9
N
10
B
14
S
13
RB
8
W
11
N
12
B
M
M
M
M165
Distribution
Motor
M164
Right Blend
Motor
M163
Left Blend Motor
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    							HEATING AND VENTILATION (WITH A/C)K4
8CIRCUIT DIAGRAM
M
Z253
Heating Ventila-
tion and Air
Conditioning
Control Unit
(HEVAC)
14 15 16 18 9C246B
BG N BN BW NU
4321
C218
K219
A/C Aspirator
Diesel Petrol
4C121
C571
9 C572
Z132
Engine Control
Module (ECM)7C106
C506
1 C505
Z132
Engine Control
Module (ECM)
24 C572
BS
5C571
C121
Diesel Petrol28 C507
BS
6C506
C106
12C102
C202
13 C246B
Z253
Heating Ventila-
tion and Air
Conditioning
Control Unit
(HEVAC)
1C202
C102
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    							HEATING AND VENTILATION (WITH A/C)K4
9CIRCUIT DIAGRAM
K218
Ambient Air Sen-
sor C246B
S206UO
42128 C245
1 C250
2 C250
WB
7 C245Z253
Heating Ventila-
tion and Air
Conditioning
Control Unit
(HEVAC)
Z253
Heating Ventila-
tion and Air
Conditioning
Control Unit
(HEVAC) UB SO GY
2 C210
1 C210
BW
10 C246BBW 1 C221X303
Evaporator Tem-
perature Sensor
X304
Water Tempera-
ture Sensor 2 C2211 C222
2 C222
BW
X305
Sun Sensor
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    							HEATING AND VENTILATION (WITH A/C)K4
10CIRCUIT DIAGRAM
S101
E154
1 C166P
7 C244
[2]
7
C102 C202BY
1 C162
[1]
2 C162
WLG
1 C166DWLG
1C119
2 C166PWLG
See Ground Dis-
tributionZ253
Heating Ventila-
tion and Air
Conditioning
Control Unit
(HEVAC)
X315
A/C Dual Pressure
Switch
[1] < 1.2 Bar (17 psi)
[2] > 30 Bar (435 psi)
[3] > 2.4 Bar (35 psi)
< 21 Bar (305 psi)
K107
Compressor
Clutch K107
Compressor
ClutchDiesel Petrol
B
[3]
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