Relays TOYOTA LAND CRUISER 1998 Factory Repair Manual

BE2EJ-01
I25272
Engine Room R/B:
HTR RelayABS MTR1 Relay
ABS MTR2 RelayC/OPN Relay
ABS SOL RelayF/PUMP Relay
EFI OR ECD RelaySTARTER Relay
- BODY ELECTRICALPOWER SOURCE
BE-15
2388 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION
1. INSPECT ENGINE ROOM R/B CIRCUIT

I24921
Fuses:
1. TOWING
2. MIR HTR
3. RR HTR
4. HAZ-TEN
5. ALT-S
6. NV-IR
7. FR FOG
8. TOWING BRK
9. HEAD CLNER
10. FR-IG
11. PANEL
12. TOWING TAIL
13. TAIL
14. -
15. BAT
16. TEL
17. AMP
18. EFI or ECD NO.1
19. AM2
20. ETCS
21. HORN
22. HEAD RH-LWR
23. HEAD LH-LWR
24. HEAD RH-UPR
25. HEAD LH-UPR
26.STARTER
27. GLOW
28. ST1
29. AHC
30. ABS NO.1
31. ABS NO.2
Relays:
A. AHC
B. ABS SOL
C. ABS MTR1
D. ABS MTR2
E. STARTER
F. EFI or ECD
G. C/OPN
H. F/PUMP
I. HTR
J. IG1 NO.1
K. MIR HTR
L. RR HTR
M. FR FOG
N. TAIL
O. PANEL
P. CDS FAN
Q. MG CLT
R. W/TEMP CUT
S. HEAD
T. HEAD HI
U. HORN
A
1
B CD
E F
G
H I
J
KL
MN O
P
RST
U Q
2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26
2728 29 30 31
Engine Room R/B BE-12
- BODY ELECTRICALPOWER SOURCE
2385 Author
: Date
:
2004 LAND CRUISER (RM1071U)

I24922
Cowl Side J/B LH
ABCD
Relays:
A. DEFOG
B. IG1 No.2
C. ACC
D. DOME Fuses:
1. AHC-IG
2. POWER HTR
3. FUEL HTR
4. AHC-B
5. DEFOG
6. AM1
7. ACC
8. CIG
9. PWR OUTLET
10. OBD-2
11. STOP
12. A/C
13. BATT CHARGE
14. DBL LOCK
15. ECU-B1
16. ECU-IG1
17. GAUGE1
18. EFI or ECD NO.2
19. RR WIPER
20. SUN ROOF
21. DOOR
22. LH SEAT
23. IDLE UP
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18
19 20 21 22 23
- BODY ELECTRICALPOWER SOURCE
BE-13
2386 Author
: Date
:
2004 LAND CRUISER (RM1071U)

I24923
Cowl Side J/B RH
Relays:
A. ACC CUT
B. IG1 NO.3
C. POWER MAIN Fuses:
1. P/W (RL)
2. P/W (FL)
3. VGRS
4. DOME
5. RADIO
6. WASHER
7. DIFF
8. ECU-B2
9. P/W(FR)
10.P/W(RR)
11. SECURITY
12. IGN
13. MET
14. GAUGE 2
15. SEAT HTR
16. ECU-IG2
17. WIPER
18. RH SEAT
19. RR A/C
20. TIL&TEL
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16 17
18 19 20 21 22
BA
BE-14
- BODY ELECTRICALPOWER SOURCE
2387 Author
: Date
:
2004 LAND CRUISER (RM1071U)

BE01J-17
BE-2
- BODY ELECTRICALTROUBLESHOOTING
2375 Author
: Date
:
2004 LAND CRUISER (RM1071U)
TROUBLESHOOTING
PROBLEM SYMPTOMS TABLE
IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH:
This system uses the body control system, so check the body control system before you proceed with trou-
bleshooting (See page DI-1038).
SymptomSuspect AreaSee page
Ignition switch is not set to each position.4. Ignition switch
5. Power source circuitBE-29
-
Ignition key illumination does not light up.
1. Bulb
2. Body ECU
3. Wire Hauness-
DI-1038
-
Key unlock warning system does not operate.
(The buzzer does not sound when the driver's door is opened with
the ignition OFF and key inserted)1. Key Unlock Warning Switch
2. Door Courtesy Switch
3. Wire HarnessBE-29
BE-44
-
Key unlock warning system does not operate.
(The buzzer sounds when the ignition key is in ACC or ON)1. Ignition Switch
2. Wire HarnessBE-29
-
HEADLIGHT AND TAILLIGHT SYSTEM:
This system uses the body control system, so check the body control system before you proceed with trou-
bleshooting (See page DI-1038).
SymptomSuspect AreaSee page
ºAutomatic light control systemº does not operate.
1. Automatic Light Control Sensor
2. Light Control Switch
3. Door Courtesy Switch
4. Wire HarnessBE-32
BE-32
BE-44
-
Auto turn-off system does not operate when the driver's door is
opened.1. Drivers Door Courtesy SwitchBE-44
Auto turn-off system:
Headlight and taillight do not come on.1. Body ECU
2. Wire HarnessDI-1038
-
Auto turn-off system:
Headlight and taillight stay on.1. Body ECU
2. Wire HarnessDI-1038
-
Only one headlight comes on.
1. Daytime Running Light No.3, 4 Relays
2. Body ECU
3. Bulb
4. Wire HarnessBE-32
BE-32
-
-
ºLO-beamº does not light (All).1. Engine Room J/B Relay Circuit
2. Wire HarnessBE-15
-
ºLO-beamº does not light (One side).
1. Bulb
2. H-LP L-LWR Fuse
3. H-LP R-LWR Fuse
4. Wire Harness-
-
-
-
ºHI-beamº does not light (All).
1. Headlight Dimmer Switch
2. Body ECU
3. Wire HarnessBE-32
BE-32
-
ºHI-beamº does not light (One side).
1. Bulb
2. H-LP L-UPR Fuse
3. H-LP R-UPR Fuse
4. Daytime Running Light No.3, 4 Relays
5. Wire Harness-
-
-
BE-32
-
ºFlashº does not light.
1. Headlight Dimmer Switch
2. Body ECU
3. Wire HarnessBE-32
BE-32
-

- BODY ELECTRICALTROUBLESHOOTING
BE-3
2376 Author
: Date
:
2004 LAND CRUISER (RM1071U) Headlight does not come on.
1. Engine Room J/B Relay Circuit
2. Body ECU
3. Daytime Running Light No.3, 4 Relays
4. Headlight Dimmer Switch
5. Light Control Switch
6. Wire Harness
7. BulbBE-15
BE-32
BE-32
BE-32
BE-32
-
-
Headlight does not come on with light control switch in HEAD.1. Light Control Switch
2. Wire HarnessBE-32
-
Headlight does not go out with light control switch in OFF.1. Engine Room J/B Relay Circuit
2. Wire HarnessBE-15
-
Headlight flickers.1. Bulb
2. Wire Harness-
-
Headlight is dark.1. Bulb
2. Wire Harness-
-
Taillight does not come on with light control switch in TAIL.
1. Engine Room J/B Relay Circuit
2. Light Control Switch
3. Wire HarnessBE-15
BE-32
-
Taillight does not go out with light control switch in OFF.
1. Engine Room J/B Relay Circuit
2. Light Control Switch
3. Wire HarnessBE-15
BE-32
-
Headlight does not come on with engine running and light control
switch in OFF.
1. ECU-B1 Fuse
2. ECU-IG1 Fuse
3. Body ECU
4. Daytime Running Light No.3, 4 Relays
5. Generator L Terminal
6. Parking Brake Switch
7. Wire Harness-
-
BE-32
BE-32
CH-10
BE-63
-
FOG LIGHT SYSTEM:
SymptomSuspect AreaSee page
Fog light does not light up with light control SW HEAD
(Headlight is normal.)
1. FOG Fuse
2. Engine Room J/B Relay Circuit
3. Fog Light Switch
4. Wire Harness-
BE-15
BE-37
-
Fog light does not light up with light control SW HEAD
(Headlight does not light).1.*1 Other Parts
2. Wire Harness-
-
Only one light does not light up.1. Bulb
2. Wire Harness-
-
*1: Inspect Headlight System
TURN SIGNAL AND HAZARD WARNING SYSTEM:
SymptomSuspect AreaSee page
ºHazardº and ºTurnº do not light up.
1. ECU-IG2 Fuse
2. TURN HAZ Fuse
3. Ignitioin Switch
4. Turn Signal Flasher Relay
5. Wire Harness-
-
BE-29
BE-40
-
Hazard warning light does not light up.
(Turn is normal)1. Hazard Warning Switch
2. Wire HarnessBE-40
-
Turn signal does not light up.
(Hazard is normal)1. Turn Signal Switch
2. Wire HarnessBE-40
-

DI-588- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEM
781 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1, in case of using the hand-held tester and start from step 3, in case of not
using hand-held tester.
1 Check ABS motor 1 and ABS motor 2 relay operation.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the hand-held tester.
CHECK:
Check the operation sound of the ABS motor relays individually when operating it with the hand-held tester.
OK:
The operation sound of the ABS motor 1 relay and ABS motor 2 relay should be heard.
NG Go to step 3.
OK
2 Check for short circuit (to B+) in harness and connector between MT of hydrau-
lic brake booster and skid control ECU (See page IN-36).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU.

F06425
Hand-held
Tester
DLC3
- DIAGNOSTICSABS & VEHICLE STABILITY CONTROL (VSC) &
BRAKE ASSIST (BA) SYSTEMDI-507
700 Author
: Date
:
2004 LAND CRUISER (RM1071U)
(e) In case of using hand-held tester:
Clear the DTC.
(1) Hook up the hand-held tester to the DLC3.
(2) Turn the ignition switch ON.
(3) Operate the hand-held tester to erase the codes.
(See the hand-held tester operator's manual.)
2. DATA LIST
HINT:
According to the DATA LIST displayed by the hand-held tester, you can read the value of the switch, sensor,
actuator and so on without parts removal. Reading the DATA LIST as a first step of troubleshooting is one
of the methods to shorten labor time.
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) According to the display on the tester, read the ºDATA LISTº.
ItemMeasurement Item/Range
(Display)Normal Condition*Diagnostic Note
HB MOT RELAYHB Motor relay status/
ON or OFF--
ABS MOT RELAYMotor relay status/ ON or OFF--
SOL RELAYSolenoid relay status/
ON or OFF--
PRESS HIGH
HIGH Hydraulic brake boost pres-
sure/ ON or OFF
--
PRESS LOWLOW Hydraulic brake boost
pressure/ ON or OFF--
VSC/TRC OFF SWVSC OFF switch/ ON or OFF--
IDLE SWMain idle switch/ ON or OFFON: Accelerator pedal released
OFF: Accelerator pedal depressed-
STOP LIGHT SWStop light switch/ ON or OFFON: Brake pedal released
OFF: Brake pedal depressed-
PKB SWPKB sw/ ON or OFFON: Parking brake applied
OFF: Parking brake released-
ABS OPERT FRFront Right wheel operation/
BEFORE or OPERATEBEFORE: No ABS operation (FR)
OPERATE: During ABS operation
(FR)
-
ABS OPERT FLFront Left wheel operation/
BEFORE or OPERATEBEFORE: No ABS operation (FL)
OPERATE: During ABS operation
(FL)
-
ABS OPERT RRRear Right wheel operation/
BEFORE or OPERATEBEFORE: No ABS operation (RR)
OPERATE: During ABS operation
(RR)
-
ABS OPRET RLRear Left wheel operation/
BEFORE or OPERATEBEFORE: No ABS operation (RL)
OPERATE: During ABS operation
(RL)
-
WHEEL SPD FRFront Right wheel speed /
Min.: 0km/h, Max.: 326.4 km/hActual wheel speedSpeed indicated on speedometer

2004 LAND CRUISER (EWD548U)
2A INTRODUCTION
This manual consists of the following 13 sections:
No.
SectionDescription
A
INDEXIndex of the contents of this manual.
A
INTRODUCTIONBrief explanation of each section.
BHOW TO USE THIS
MANUALInstructions on how to use this manual.
CTROUBLE-
SHOOTINGDescribes the basic inspection procedures for electrical circuits.
DABBREVIATIONSDefines the abbreviations used in this manual.
E
GLOSSARY OF
TERMS AND
SYMBOLS
Defines the symbols and functions of major parts.
FRELAY LOCATIONSShows position of the Electronic Control Unit, Relays, Relay Block, etc.
This section is closely related to the system circuit.
GELECTRICAL
WIRING ROUTINGDescribes position of Parts Connectors, Splice points, Ground points, etc.
This section is closely related to the system circuit.
INDEXIndex of the system circuits.
H
SYSTEM CIRCUITS
Electrical circuits of each system are shown from the power supply through ground
points. Wiring connections and their positions are shown and classified by code
according to the connection method. (Refer to the section, ºHow to use this manualº).
The ºSystem Outlineº and ºService Hintsº useful for troubleshooting are also contained
in this section.
IGROUND POINTShows ground positions of all parts described in this manual.
JPOWER SOURCE
(Current Flow Chart)Describes power distribution from the power supply to various electrical loads.
KCONNECTOR LISTDescribes the form of the connectors for the parts appeared in this book.
This section is closely related to the system circuit.
LPART NUMBER OF
CONNECTORSIndicates the part number of the connectors used in this manual.
M
OVERALL
ELECTRICAL
WIRING DIAGRAM
Provides circuit diagrams showing the circuit connections.

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.