Land Rover Range Rover Etm 1995 4th Edition Rover Manual

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...

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...

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...

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...

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 

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 

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 

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 

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 

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]