1998 TOYOTA LAND CRUISER relay

2004 LAND CRUISER (EWD548U)
360Air Conditioning (Front)
13 3NA45(
A)
, A46(
B)
, A47(
C)
B 14TPI
3N 8
3N 19
L- R L- R
A 1AIF AIR
2A
3N 15
G- W
LG- B
345
12
Y- G
G- R
A24
B 8TS
3D 28
3Q 83
B- Y
1 2
3Q 81
3E 30
73P 3N5A18
B 9FRS5
SB
G- R G- R
G- RSB
C 1 TAMO2
4A 16
4E 1
P- L
A 19MPX+
4A 10
4E 6
B
A 39MPX-
4C 3
4E 4
P- B
411
512
B
P- B P- L
P- BP- L
G 4(
*2)
M 6(
A)
, M 9(
B)
(
*1)
(
*1) (
*1) (
*1) (
*1)
(
*1)(
*2)
GTX-
A/C
TEMPTX3 + TX3- GTX+ MPD1 MPD2C 6SPD
V
A 10RDFGR
LG
A 6 MRRHR
R
A 40RRMGV
LG- R Combination Meter
DEFOG Relay
MIR HTR Relay
Rear Cooler Magnetic Valve A/C Solar Sensor Air Inlet Control Servo Motor
Gateway ECU
Multi- Display A/C Control Assembly
VZ GNDPT MFRS MREC
M
B 16 A11 A12 Ic2 5Ic24
P- L
P- B(
*1)
(
*1)

2004 LAND CRUISER (EWD548U)
363
: Parts Location
CodeSee PageCodeSee PageCodeSee Page
A168A45A70F1868
A468A46B70G470
A568A47C70J1171
A1870B170J23B72
A1970B970J25A72
A2470C2870M6A71
A2570E7C70M9B71
A2670E8D70R771
A3272E9E70
:Relay Blocks
CodeSee PageRelay Blocks (Relay Block Location)
122Engine Room R/B (Engine Compartment Left)
:Junction Block and Wire Harness Connector
CodeSee PageJunction Block and Wire Harness (Connector Location)
1A24Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
1B24Engine Room No.2 Wire and Engine Room J/B (Engine Compartment Left)
2A28Engine Room No.2 Wire and Cowl Side J/B LH (Left Kick Panel)
2D28Dash Wire and Cowl Side J/B LH (Left Kick Panel)2E28Dash Wire and Cowl Side J/B LH (Left Kick Panel)
2Q30Instrument Panel Integration Wire and Cowl Side J/B LH (Left Kick Panel)
3D
3E40Dash Wire and Cowl Side J/B RH (Right Kick Panel)
3H
(g )
3K40Floor No.2 Wire and Cowl Side J/B RH (Right Kick Panel)
3M
3N43Dash Wire and Cowl Side J/B RH (Right Kick Panel)
3P
(g )
3Q42Instrument Panel Integration Wire and Cowl Side J/B RH (Right Kick Panel)
4A
4C
4D52Dash Wire and J/B No.4 (Instrument Panel Center)
4E
()
4F
5A56Dash Wire and J/B No 5 (Behind the Combination Meter)5B56Dash Wire and J/B No.5 (Behind the Combination Meter)
5D56Engine Room No.2 Wire and J/B No.5 (Behind the Combination Meter)
:Connector Joining Wire Harness and Wire Harness
CodeSee PageJoining Wire Harness and Wire Harness (Connector Location)
IG178Engine Room No 2 Wire and Dash Wire (Behind the Combination Meter)IG578Engine Room No.2 Wire and Dash Wire (Behind the Combination Meter)
IN280Engine Wire and Dash Wire (Behind the Glove Box)
IV482Dash Wire and Floor No.2 Wire (Right Kick Panel)
Ic284Dash Wire and Dash Wire (Behind the Center Panel)

2004 LAND CRUISER (EWD548U)
368Air Conditioning (Rear)
3KA 14HRRH
18
3B 10
1B 71 1B52
50 1B 10A
RR
HTR From Power Source System
(
See Page 94)
L- B L- B
F
L
IA2 18
2 1
L- B
L- W
W- B
R
W
B
W- B
LG- R
L- B
L- B L
L
BJ 32
1A 16BLWRH
A 15VMRH
BL4 1BL42
BD3 19 18 BD3R- W
R- G R- W
R- G R- W
R- G W- B W- B
R25
L- W
W- B
R
W
B
W- B
LG- R R22
RR HTR
RelayA32(
A)
, A33(
B)
, A34(
C)
A/C Amplifier (
Rear)
Rear Heater
Blower Motor
Rear Heater Power Transistor4 F
L- B Junction
Connector J22 M

2004 LAND CRUISER (EWD548U)
369
A 18CID CLK
20 A CSD
19 A A 22GND +B
1A
BW1 6A 4BLWC
23
14
BW1 8
W- B W- BR R
BW1 5A 3VMC
W- L W- L
R16
BW1 10A 13HRRC
R- Y R- Y
23 41
2 1
L
R- L
B19
R14
R17
30A
RR A/CFrom Power Sour ce System
(
See Page 94)
3K 42
BW1 7
LG
LG LG
R- L
2 1
LG- R R- LW W
LG- RW- BB WR W- BL- WA32(
A)
, A33(
B)
, A34(
C)
L- W
W- B
R
W
B
R15
A/C Amplifier (
Rear)
Rear Cooler
Blower Motor
Rear Cooler
Magnetic ValveRear Cooler
Power Tr ansistor
Rear Cooler Relay
M

To Ignition SW
IG Terminal
Fuse
Voltmeter SW 1
Relay
SW 2Solenoid[A]
[B]
[C]
Ohmmeter
SW
Ohmmeter
Diode
Digital Type Analog Type
2004 LAND CRUISER (EWD548U)
12C TROUBLESHOOTING
VOLTAGE CHECK
(a)Establish conditions in which voltage is present at the check
point.
Example:
[A] - Ignition SW on
[B] - Ignition SW and SW 1 on
[C] - Ignition SW, SW 1 and Relay on (SW 2 off)
(b)Using a voltmeter, connect the negative lead to a good ground
point or negative battery terminal, and the positive lead to the
connector or component terminal.
This check can be done with a test light instead of a voltmeter.
CONTINUITY AND RESISTANCE CHECK
(a)Disconnect the battery terminal or wire so there is no voltage
between the check points.
(b)Contact the two leads of an ohmmeter to each of the check
points.
If the circuit has diodes, reverse the two leads and check
again.
When contacting the negative lead to the diode positive side
and the positive lead to the negative side, there should be
continuity.
When contacting the two leads in reverse, there should be no
continuity.
(c)Use a volt/ohmmeter with high impedance (10 kW/V
minimum) for troubleshooting of the electrical circuit.

To Ignition SW
IG Terminal
Test Light
Relay Light
SW 2 SolenoidDisconnectShort [A]
Disconnect
DisconnectSW 1Fuse Case
Short [B]
Short [C]
Pull Up
Press Down Press DownPull Up
2004 LAND CRUISER (EWD548U)
13 C
FINDING A SHORT CIRCUIT
(a)Remove the blown fuse and disconnect all loads of the fuse.
(b)Connect a test light in place of the fuse.
(c)Establish conditions in which the test light comes on.
Example:
[A] - Ignition SW on
[B] - Ignition SW and SW 1 on
[C] - Ignition SW, SW 1 and Relay on (Connect the
Relay) and SW 2 off (or Disconnect SW 2)
(d)Disconnect and reconnect the connectors while watching the
test light.
The short lies between the connector where the test light
stays lit and the connector where the light goes out.
(e)Find the exact location of the short by lightly shaking the
problem wire along the body.
CAUTION:
(a) Do not open the cover or the case of the ECU unless
absolutely necessary. (If the IC terminals are touched,
the IC may be destroyed by static electricity.)
(b) When replacing the internal mechanism (ECU part) of
the digital meter, be careful that no part of your body or
clothing comes in contact with the terminals of leads
from the IC, etc. of the replacement part (spare part).
DISCONNECTION OF MALE AND FEMALE
CONNECTORS
To pull apart the connectors, pull on the connector itself, not
the wire harness.
HINT : C h e c k t o s e e w h a t k i n d o f connector you are
disconnecting before pulling apart.

V07268
VIBRATION METHOD: When vibration seems to be the major cause.
CONNECTORS
WIRE HARNESS
PARTS AND SENSOR1
Slightly shake the connector vertically and horizontally.
Slightly shake the wire harness vertically and horizontally.
The connector joint, fulcrum of the vibration, and body
through portion are the major areas to be checked thorough-
ly.
Apply slight vibration with a finger to the part of the sensor
considered to be the problem cause and check that the mal-
function occurs.Shake Slightly
Swing Slightly
Vibrate Slightly
HINT:
Applying strong vibration to relays may result in open relays. IN-30
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
30 Author
: Date
:
2004 LAND CRUISER (RM1071U)
3. SYMPTOM SIMULATION
The most difficult case in troubleshooting is when there are no problem symptoms occurring. In such cases,
a thorough customer problem analysis must be carried out, then simulate the same or similar conditions and
environment in which the problem occurred in the customer's vehicle. No matter how much experience a
technician has, or how skilled he may be, if he proceeds to troubleshoot without confirming the problem
symptoms he will tend to overlook something important in the repair operation and make a wrong guess
somewhere, which will only lead to a standstill. For example, for a problem which only occurs when the en-
gine is cold, or for a problem which occurs due to vibration caused by the road during driving, etc., the prob-
lem can never be determined so long as the symptoms are confirmed with the engine hot condition or the
vehicle at a standstill. Since vibration, heat or water penetration (moisture) is likely cause for problem which
is difficult to reproduce, the symptom simulation tests introduced here are effective measures in that the ex-
ternal causes are applied to the vehicle in a stopped condition.
Important Points in the Symptom Simulation Test:
In the symptom simulation test, the problem symptoms should of course be confirmed, but the problem area
or parts must also be found out. To do this, narrow down the possible problem circuits according to the symp-
toms before starting this test and connect a tester beforehand. After that, carry out the symptom simulation
test, judging whether the circuit being tested is defective or normal and also confirming the problem symp-
toms at the same time. Refer to the problem symptoms table for each system to narrow down the possible
causes of the symptom.

- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN-33
33 Author
: Date
:
2004 LAND CRUISER (RM1071U)
5. PROBLEM SYMPTOMS TABLE
The suspected circuits or parts for each problem symptom are shown in the table below. Use this table to
troubleshoot the problem when a ºNormalº code is displayed in the diagnostic trouble code check but the
problem is still occurring. Numbers in the table indicate the inspection order in which the circuits or parts
should be checked.
HINT:
When the problem is not detected by the diagnostic system even though the problem symptom is present,
it is considered that the problem is occurring outside the detection range of the diagnostic system, or that
the problem is occurring in a system other than the diagnostic system.
Symptom
Suspect AreaSee page
Engine does not crank (Does not start)
No initial combustion (Does not start)
No complete combustion (Does not start)1. Starter and starter relay
1. ECM power source circuit
2. Fuel pump control circuit
3. Engine control module (ECM)
1. Starter signal circuit
2. Fuel pump control circuit1. Fuel pump control circuitDI-147
DI-151
IN-29
PROBLEM SYMPTOMS TABLE
1. Compression
2. Fuel pump control circuit 1. A/C signal circuit
2. Fuel pump control circuit 1. A/C signal circuit (Compressor circuit)
2. ECM power source circuit 1. Starter signal circuit
2. Fuel pump control circuit1. Starter signal circuit
2. Fuel pump control circuit
3. Compression
idling) High engine idle speed (Poor idling) Hot engine Cold engine (Difficult to start)Engine cranks normally (Difficult to start)
AC-88 DI-144
DI-151
EM-3 DI-151

Problem Symptom
Page
Indicates the page where the flow chart for each circuit
is located.

Circuit Inspection, Inspection Order
Indicates the circuit which needs to be checked for each problem
symptom. Check in the order indicated by the numbers.

Circuit or Part Name
Indicates the circuit or part which needs to be checked.
ST-2
ST-17
DI-144
DI-151
DI-144
DI-151