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Land Rover Discovery Lhd Models Etm 1995 4th Edition Exp Rover Manual

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    							ELECTRICAL TROUBLESHOOTING MANUAL
ETM J1
Interior Lamps (except NAS)
15
DISCOVERY
15
F 18
10 A
See Ground Dis-
tributionP126
Fascia Fuse Box
B102
Automatic Gear
Selector Illumi-
nation
2 C346G 5 C204
1.0 GLG
S274
HJ1
See Fuse Details
0.5 GLG
G
B B
S2015
HJ10
0.5 B
E200 1 C346
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    							ELECTRICAL TROUBLESHOOTING MANUA L
J1 ETM
Interior Lamps (except NAS)
16
DISCOVERY
Z148
Multi±Function
Unit (MFU)
18
0.5 PW
S261
0[1]
1 C708
X142
Left Rear Door
Switch
[1] Open
0[1]
1 C608
X118
Right Front Door
Switch
[1] Open
S309
0[1]
1 C808
X163
Right Rear Door
Switch
[1] Open
1 C306
0[1]
1 C508
X150
Left Front Door
Switch
[1] Open S2013
drivers side0.5 PW
C2055
S435
0[1]
1 C451
X265
Rear End Door
Switch
8 C415 Not used11 C277
0.5
PW
Except NAS NAS
0.5 PW
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    							ELECTRICAL TROUBLESHOOTING MANUAL
ETM J2
Cigar Lighter/Clock
1
DISCOVERY

* ,* 
-

 


*  )
 !+)


 ),& *.
+),+& &+)) %(*



C226
1.0 LGW
C353 C356
C353
1.0 B0.5 RN

* ,* 
-

 
C208


+$$+ ,*

- 

 


C270


0.5 LG
 ,*
+$* ,*
+$*

0.5 PN
	
$#
C270
&+)) %(*
0.5 RN

 ),& *.
+),+&
 0.5 B
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    							BLOWER CONTROLS
1
ETM   K1
DISCOVERY
ELECTRICAL TROUBLESHOOTING MANUAL
CIRCUIT OPERATION
Front Blower
With the Ignition Switch (X134) in position II,
battery voltage is applied to the Ignition Load Relay
(K127). The relay is energized, applying battery
voltage to the Front Blower Motor Relay (K192).
When the Front Fan Speed Switch (X247) is turned
to position I, ground is applied to terminal 85 of the
Front Blower Motor Relay (K192). The relay is
energized, applying battery voltage to terminal 2 of
the Front Blower Motor (M101). Ground is applied
to the Front Blower Motor (M101) through all three
resistors of the Front Blower Resistor Unit (Z214).
The Front Blower Motor (M101) then runs at low
speed. When the Front Fan Speed Switch (X247)
is turned to position II, the Front Blower Motor
Relay (K192) remains energized. Battery voltage is
still applied to terminal 2 of the Front Blower Motor
(M101). Ground is now applied to the Front Blower
Motor (M101)  through two resistors of the Front
Blower Resistor Unit (Z214) and the Front Fan
Speed Switch (X247). The motor then runs at the
low±medium speed. When the Front Fan Speed
Switch (X247) is turned to position III, the Front
Blower Motor Relay (K192) remains energized.
Ground is now applied to the Front Blower Motor
(M101) through one resistor of the Front Blower
Resistor Unit (Z214) and the Front Fan Speed
Switch (X247). The motor then runs at the
medium±high speed. When the Front Fan Speed
Switch (X247) is turned to position IV, the Front
Blower Motor Relay (K192) remains energized.
Ground is now applied directly to the Front Blower
Motor (M101) through the Front Fan Speed Switch
(X247). The motor then runs at high speed.
Fresh Air Mode
With the Ignition Switch (X134) in position II,
battery voltage is applied to the Ignition Load Relay
(K127). The relay is energized, applying battery
voltage to the Air Recirculation Solenoid In±Line
Fuse (P138) and Air Recirculation Solenoid (K123).
When the Air Supply Selector Switch is moved to
the Fresh Air position, ground is applied to the Air
Recirculation Solenoid (K123). The solenoid now
opens the fresh air intake flap allowing fresh air to
enter the vehicle cabin. When the fresh air intake
flap has been fully opened, the microswitch inside
the Air Recirculation Solenoid (K123) moves to theFresh Air position interrupting the ground supply.
The solenoid now stops and remains in the Fresh
Air position.
Recirculated Air Mode
With the Ignition Switch (X134) in position II,
battery voltage is applied to the Ignition Load Relay
(K127). The relay is energized, applying battery
voltage to the Air Recirculation Solenoid In±Line
Fuse (P138) and Air Recirculation Solenoid (K123).
When the Air Supply Selector Switch is moved to
Recirculate Air position, ground is applied to the Air
Recirculation Solenoid (K123). The solenoid now
closes the fresh air intake flap allowing only the air
inside the vehicle cabin to circulate. When the fresh
air intake flap has been fully closed, the
microswitch inside the Air Recirculation Solenoid
(K123) moves to the Recirculate Air position
interrupting the ground supply. The solenoid now
stops and remains in the Recirculate Air position.
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    							BLOWER CONTROLS
2
K1 ETM
DISCOVERY
ELECTRICAL TROUBLESHOOTING MANUA L
Heated Air
With the Ignition Switch (X134) in position II,
battery voltage is applied to the Ignition Load Relay
(K127). The relay is energized, applying battery
voltage to the Left Maximun Cool Switch (X267).
When the Left and Right Temperature Controls are
turned to the maximum cool position, the Left
Maximum Cool Switch (X267) and Right Maximum
Cool Switch (X268) close. Battery voltage is now
applied to the Water Valve (K206). The Water
Valve (K206) closes and prevents heated engine
coolant from entering the heater matrix. When one
or both of the Temperature Controls are not in the
maximum cool position, battery voltage is not
applied to the Water Valve (K206). The valve then
opens and allows heated engine coolant to enter
the heater matrix.
Rear Blower
With the Ignition Switch (X134) in position II,
battery voltage is applied to the Ignition Load Relay
(K127). The relay is energized, applying battery
voltage to the Rear Blower Motor Relay (K193), the
Rear A/C Fan Speed Relay (K205) and the Rear
A/C Control Relay (K194).
When the Rear A/C System is turned on, the Rear
A/C Switch Amplifier provides ground to the Rear
A/C Control Relay (K194). The relay is energized,
applying ground to the Rear A/C Fan Speed Relay
(K205). The Rear A/C Fan Speed Relay (K205)
then energizes. When the Passengers Rear Fan
Speed Switch (X246) is turned to position I, ground
is applied to terminal 85 of the Rear Blower Motor
Relay (K193) through the closed switch contacts of
the Rear A/C Fan Speed Relay (K205). The Rear
Blower Motor Relay (K193) energizes, applying
battery voltage to terminal 1 of the Rear Blower
Motor (M145).
Ground is applied to the Rear Blower Motor (M145)
through all three resistors of the Rear Blower
Resistor Unit (Z215). The Rear Blower Motor
(M145) then runs at low speed. When the
Passengers  Rear Fan Speed Switch (X246) is
turned to position II, the Rear Blower Motor Relay
(K193) remains energized. Battery voltage is still
applied to terminal 1 of the Rear Blower Motor
(M145). Ground is now applied to the Rear Blower
Motor (M145) through two resistors of the Rear
Blower Motor Resistor Unit (Z215) and the
Passengers Rear Fan Speed Switch (X246). Themotor then runs at the low±medium speed. When
the Passengers Rear Fan Speed Switch (X246) is
turned to position III, the Rear Blower Motor Relay
(K193) remains energized. Ground is now applied
to the Rear Blower Motor (M145) through one
resistor of the Rear Blower Motor Resistor Unit
(Z215) and the Passengers Rear Fan Speed
Switch (Z246).
The motor then runs at medium±high speed. When
the Passengers Rear Fan Speed Switch (X246) is
turned to position IV, the Rear Blower Motor Relay
(K193) remains energized. Ground is now applied
directly to the Rear Blower Motor (M145) through
the Passengers Rear Fan Speed Switch (X246).
The motor then runs at high speed.
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    							ELECTRICAL TROUBLESHOOTING MANUAL
ETM   K1
Blower Controls
3
DISCOVERY
15
F 15
10 A
A
K1-4
15
25 A
S2045
P126
Fascia Fuse BoxP127
Satellite Fuse
Box 1
Z211
Fan Timer Diode 9 C204
0.5 LGP
85 30 C2007
K127
Ignition Load
Relay 8530
8687
86 87
0.5 GW 0.5 B
2.0 WG
0.5 WG2.0 WG
S227
18 C217 1.0 WG
Cooling Fans K2
Compressor
Controls
E200
See Fuse DetailsSee Fuse Details
See Ground Dis-
tribution
F 6
S2015HJ10C2007
0.5 WG
B
K1-7
13 C212 0.5 WG
1.0 WG
2.0 WG
7 C2073
1.25 UR Without Air
ConditioningWith Air Condi-
tioning
2.0 WG
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    							4
ELECTRICAL TROUBLESHOOTING MANUA L
K1 ETM
Blower Controls
4
DISCOVERY
S2039
10 A
2 C2071
E200
See Ground Dis-
tribution
D
CK1-5 K1-6
C2066
5
1 C2071
0.5 YB
1 C2072
3 C2072 2
0.5 UB 0.5 RG
11 C2066 6
0.5 UB 0.5 RG
5 C2067 6
0.5 WB
1 C2026
2 C2026 5 31.0 RG
S2038
1.25 UR
10 C2067
1.0 UR
Interior Lamps
0.5 LG
X180
Air Supply Selec-
tor Switch
[1] Recirculate
Inside Air
[2] Fresh Air 1.0 UR S263
5 C2025
X225
Front A/C Switch K123
Air Recirculation
Solenoid
[1] Solenoid in
Fresh Air
Position
[2] Solenoid in
Recirculate
Air Position P138
Air Recirculation
Solenoid In±Line
Fuse
Z208
Air Supply Selec-
tor Diode
With Air Condi-
tioning only
1.0 RG
S2440.5 UR1.0
URK1-3
1.25
UR
M
A
1.0 UB[2]
[1]
[2][1]
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    							ELECTRICAL TROUBLESHOOTING MANUAL
ETM K1
Blower Controls
5
DISCOVERY
S204
2 C2023
E200
See Ground Dis-
tribution
0.5 LG1.0 UR
4
X267
Left Maximum
Cool Switch
[1] Temperature
Control in
Maximum
Cool Posi-
tion
1 C2023
0.5 S
4 C2067
1.25 S
10 C2073
0.5 YR
1 C179
K206
Water Valve
2 C179
0.5 B
S244
E201 0.5 WB3
Interior Lamps
HJ10
B140
Ventilation Con-
trol Panel Illumi-
nation
0[1]
X268
Right Maximum
Cool Switch
[1] Temperature
Control in
Maximum
Cool Posi-
tion
0[1]
Early Production
C
K1-4
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    							3.0 BO
ELECTRICAL TROUBLESHOOTING MANUA L
K1 ETM
Blower Controls
6
DISCOVERY
S2040
30
MF 2
60 A
1C114
E200
M
See Fuse Details
1 C2068
D
K1-4
5 1.25 UR
87a87
30
42 3
3.0 WR
C2069
C2069 2
1
C2068
0.5 N
M101
Front Blower
Motor4 C2066K192
Front Blower
Motor Relay
S2056
0.5
NC2067
21.0
N
X225
Front A/C Switch
1 C2025
C2070 1
C2070
C20702
32.0
G
2.0
PU
C2070 4
See Ground Dis-
tribution
C2066C2027
3.0
WB1 C2022
0III
III
IV0III
III
IV
X247
Front Fan Speed
Switch
C202253 4 2 2.0 N2.0 PU
2.0 G3.0 BO
5 4 3 2 Z214
Front Blower
Resistor Unit
3.0 WB 3.0 WB
S266C2027
1 2 3 C2066
With Air Condi-
tioning only 85 86
P125
Engine Compart-
ment Fuse Box
1 7
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    							ELECTRICAL TROUBLESHOOTING MANUAL
ETM K1
Blower Controls (with Rear A/C)
7
DISCOVERY
E400
K194
Rear A/C Control
Relay 86
See Ground Dis-
tribution
2 C448
2 C4631.0 WG
B
K1-3
1.25 WG
8530
87
1
0.5 G3
6 C467
Z216
Rear A/C Switch
Amplifier
3 C463
0.5 BS429
S426
K205
Rear A/C Fan
Speed Relay 86
2 C466
8530
871
34 C466
0.5 S
S430
K204
Rear A/C Illumi-
nation Relay 86
2 C465
8530
871
34 C465
1.25 UW
G
K1-8
0.5 BR 0.5 S
F
K1-8
H
K1-9
I
K1-9
E
K1-10
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