CIRCUIT DIAGRAMSB-68
CENTRALIZED JUNCTION
FUSIBLE LINK
No.CircuitTypeHousing colourRated capacity
(A)
1Multi-purpoes fuses No. 15, 16, 17, 19, 20Screwed typeYellow60
2Cooling circuit and manual air conditioner circuitConnector typeRed50
3ABS circuitConnector typeYellow60
4Ignition switchConnector typeGreen40
5Power window circuitConnector typePink30
6Battery, fusible links No. 1, 2, 3, 4 and 5,
dedicated fuses No. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
18, starting system, front-ECUScrewed type-100
7ACDScrewed type-60
(Relay box in engine compartment)
Front of vehicle
(Connected directly to battery positive (+) terminal)
Front of vehicle
1
234
5
6 7
6
CIRCUIT DIAGRAMSB-69
DEDICATED FUSE
Power supply
circuitNo.Rated
capacity (A)Identification
colourCircuit
Battery/alternator
(FusiblelinkNo6)
115BlueSpare connectors
(FusiblelinkNo.6)210RedHorn relay
320YellowEngine control relay and ignition control relay
410RedA/C compressor
515BlueABS-ECU, 4WD-ECU, high-mounted stop lamp and rear
combination lamp
630GreenCondenser fan motor
77.5BrownAlternator
810RedETACS-ECU
9---
1015BlueFuel pump
Front-ECU
(Headlamprelay:
1110RedHeadlamp
(Headlamp relay:
HI)1210RedHeadlamp
Front-ECU
(Headlamprelay:
1310RedFront combination lamp
(Headlamp relay:
LO)1410RedFront combination lamp
Front-ECU
(Tail lamp relay)157.5BrownHeater control unit or A/C-ECU, clock, combination
meter, fog lamp switch, hazard warning switch, radio,
rear combination lamp, headlamp leveling switch, front
combination lamp, cigarette lighter illumination lamp,
ashtray illumination lamp, ACD mode changeover switch
and inter cooler water splay switch
167.5BrownFront combination lamp, licence plate lamp and rear
combination lamp
Ignition switch
(ACC)1710RedClock
Battery/alternator
(Fusible link No. 6)1810RedEngine-ECU, ETACS-ECU, front-ECU and combination
meter
-19---
Fusible link No. 52120YellowIntercooler water splay
-22---
Ignition switch
(IG2)23---
-24---
Battery/alternator
(Fusible link No. 6)2530GreenCondenser fan motor
CIRCUIT DIAGRAMSB-71
MULTI-PURPOSE FUSE (In junction block)
Power supply
circuitNo.Rated
capacity (A)Identification
colourCircuit
Ignition
switch
IG1110RedIgnition coil
switch
27.5BrownColumn switch, combination meter, ETACS-ECU,
SRS-ECU, vehicle speed sensor and ACD mode
changeover switch
37.5BrownETACS-ECU and SRS-ECU
4---
IG257.5BrownA/C compressor relay, A/C-ECU, blower relay,
condenser fan relay, defogger relay, front-ECU,
4WD-ECU, steering wheel sensor and inter cooler
water splay relay
Multi-purpose fuse
No. 20 (Defogger
relay)6---
Ignition
switch
ACC720YellowFront-ECU and windshield wiper motor
switch
IG187.5BrownEngine-ECU and fuel pump relay (1) and fuel pump
relay (2)
ACC915BlueCigarette lighter
10---
117.5BrownA/C-ECU and remote controlled mirror switch
IG2127.5BrownABS-ECU, G-sensor (longitudinal) and G-sensor
(lateral)
ACC13---
14---
Fusible link No. 1
Battery/alternator
1515BlueDiagnosis connector
Battery/alternator
1610RedRear fog lamp relay
1710RedETACS-ECU
18---
1930GreenBlower motor and resistor
2030GreenDefogger
CIRCUIT DIAGRAMSB-85
CHARGING SYSTEM (See P.B-84.)
OPERATION
When engine is stationary
DWhen the ignition switch is turned to the ON
position, current flows the alternator L terminal
and, at the same time, the charge warning lamp
illuminates.
When engine is started and after engine has
started
DWhen the engine is started, the charge warning
lamp goes out because of the charging voltage
begin applied to the alternator L terminal.
DThe battery voltage being applied to the
alternator S terminal is monitored by the voltage
regulator. Therefore, the amount of electricity
produced by the alternator is controlled by
allowing and cutting off the current flowing to
the field coil.
DThe alternator B terminal supplies power to
each load.TROUBLESHOOTING HINTS
1. Charging indicator lamp does not illuminate
when the ignition switch is turned to ON
position, before the engine starts.
DCheck multi-purpose fuse No.(2).
DCheck the bulb.
2. Charging indicator lamp fails to switch off once
the engine starts.
DCheck voltage regulator of alternator.
3. Discharged or overcharged battery.
DCheck voltage regulator of alternator.
4. Charge warning lamp illuminates dimly.
DCheck combination meter diode (for short).
CIRCUIT DIAGRAMSB-155
FUEL WARNING LAMP (See P.B-156.)
OIL PRESSURE WARNING LAMP (See P.B-157.)
BRAKE WARNING LAMP (See P.B-157.)
OPERATION
DWhen the ignition switch is at the “ON” position,
the fuel gauge unit resistance is small when
the fuel level is high, and the fuel gauge unit
resistance is large when the fuel level is low.
When this resistance rises above a specified
value, the fuel warning lamp illuminates to notify
the driver that the fuel level is low.
DWhen the lubrication system fails after engine
starting, resulting in the oil pressure failing to
build up, the oil pressure switch turns on
causing the oil pressure warning lamp to
illuminate.
DWhen the brake fluid level goes down below
a predetermined level with the ignition switch
in the “ON” position, the brake fluid level switch
is activated or the parking brake switch is turned
on, causing the brake warning lamp to
illuminate.TROUBLESHOOTING HINTS
1. No warning lamps illuminate.
DCheck multi-purpose fuse No.(2).
2. Some warning lamps do not illuminate.
DCheck lamp valve.
DCheck the switches and the gauge unit.
00-1
GENERAL
CONTENTS
HOW TO USE THIS MANUAL 2..............
Scope of Maintenance, Repair and Servicing
Explanations 2.................................
Indication of Destination 2......................
Definition of Terms 2...........................
Indication of Tightening Torque 2................
Model Indications 3............................
Explanation of Manual Contents 4...............
HOW TO USE
TROUBLESHOOTING/INSPECTION SERVICE
POINTS 6....................................
Troubleshooting Contents 6.....................
Diagnosis Function 7...........................
How to Use the Inspection Procedures 10........
Connector Measurement Service Points 11.......
Connector Inspection 12........................
Inspection Service Points for a Blown Fuse 13...
Points to Note for Intermittent Malfunctions 13....
VEHICLE IDENTIFICATION 14.................
Vehicle Information Code Plate 14...............Models 14.....................................
Model Code 15................................
Chassis Number 16............................
Engine Model Number 16.......................
MAJOR SPECIFICATIONS 17.................
PRECAUTIONS BEFORE SERVICE 18.........
SUPPLEMENTAL RESTRAINT SYSTEM
(SRS) 21...................................
SRS SERVICE PRECAUTIONS 22.............
SUPPORT LOCATIONS FOR LIFTING AND
JACKING 24.................................
Support Positions for a Garage Jack and Axle
Stands 24.....................................
Support Positions for a Single-Post Lift or
Double-Post Lift 25.............................
Support Positions and Support Method for an
H-Bar Lift 26..................................
STANDARD PART/TIGHTENING-TORQUE
TABLE 28....................................
GENERAL -How to Use Troubleshooting/Inspection Service Points00-10
HOW TO USE THE INSPECTION PROCEDURES
The causes of a high frequency of problems occurring in electronic circuitry are generally the connectors,
components, the ECU and the harnesses between connectors, in that order. These inspection procedures
follow this order, and they first try to discover a problem with a connector or a defective component.
DIndicator does not turn on or off even if control
mode switch is pressed.
DIndicator switch should not be illuminated is
illuminated.Probable cause
OK
OK
OK
Measure at switch connector A-44
DDisconnect the connector, and measure at the harness
side.
DVoltage between terminal 6 - earth and terminal 8 -
earth
OK:Approx. 5V
OK
NG
Check the following connector.A-44
Repair
OK
Check trouble symptom.
Replace the ECS-ECU.
In the above cases, the ECS switch circuit is defective or the indicator
circuit is defective.
CHECKING PROCEDURE 4
2. Indicates inspection carried out using the
MUT-II.
Indicates the operation and inspection proce-
dures.
Indicates the OK judgement conditions.
3. Detailed inspection procedures (methods)
such as component inspection and circuit
inspection are listed on a separate page, and
are given here for reference.
5. Inspect the contact condition at each connector terminal.
(Refer to Connector Inspection Service Points.)
The connector position can be located in the wiring diagram in the
electrical wiring manual by means of this symbol.
Caution
After carrying out connector inspection, always be sure to
reconnect the connector as it was before.
6. Confirm that there are trouble symptoms. If trouble symptoms have
disappeared, the connector may have been inserted incorrectly and the
trouble symptom may have disappeared during inspection.
If it seems that trouble symptoms still remain, proceed to the next page of
instructions.
7. If trouble symptoms still remain up to this stage, there is a possibility that there is an
open or short circuit in the harness between the connectors, so check the harness.
Alternatively, the cause may be a defective ECU, so try replacing the ECU and check
if the trouble symptom disappears.
NGECU switch component inspection (Refer to P.33-44.)
NG
1. Comments on the diagnosis code or trouble
symptom above.
MUT-IIData list
17 Control mode selection switch
OK:Voltage changes between approx. 0V→approx.
2.5V→approx. 5V when the switch is operated.
4. Indicates voltage and resistance to be measured at a particular
connector.
(Refer to Connector Measurement Service Points.)
The connector position can be located in the wiring diagram in the
electrical wiring manual by means of this symbol.
Indicates operation and inspection procedures, inspection terminals
and inspection conditions.
Indicates the OK judgement conditions.
HARNESS INSPECTION
Check for an open or short circuit in the harness between the terminals which were defective according
to the connector measurements. Carry out this inspection while referring to the electrical wiring manual.
Here, “Check harness between power supply and terminal xx” also includes checking for blown fuses.
For inspection service points when there is a blown fuse, refer to “Inspection Service Points for a Blown
Fuse.”
MEASURES TO TAKE AFTER REPLACING THE ECU
If the trouble symptoms have not disappeared even after replacing the ECU, repeat the inspection procedure
from the beginning.
GENERAL -How to Use Troubleshooting/Inspection Service Points00-13
INSPECTION SERVICE POINTS FOR A BLOWN
FUSE
Remove the blown fuse and measure the resistance between
the load side of the blown fuse and the earth. Set the switches
of all circuits which are connected to this fuse to a condition
of continuity. If the resistance is almost 0Ωat this time,
there is a short somewhere between these switches and the
load. If the resistance is not 0Ω, there is no short at the
present time, but a momentary short has probably caused
the fuse to blow.
The main causes of a short circuit are the following.
DHarness being clamped by the vehicle body
DDamage to the outer casing of the harness due to wear
or heat
DWater getting into the connector or circuitry
DHuman error (mistakenly shorting a circuit, etc.)
POINTS TO NOTE FOR INTERMITTENT
MALFUNCTIONS
Intermittent malfunctions often occur under certain conditions,
and if these conditions can be ascertained, determining the
cause becomes simple. In order to ascertain the conditions
under which an intermittent malfunction occurs, first ask the
customer for details about the driving conditions, weather
conditions, frequency of occurrence and trouble symptoms,
and then try to recreate the trouble symptoms. Next, ascertain
whether the reason why the trouble symptom occurred under
these conditions is due to vibration, temperature or some
other factor. If vibration is thought to be the cause, carry
out the following checks with the connectors and components
to confirm whether the trouble symptom occurs.
The objects to be checked are connectors and components
which are indicated by inspection procedures or given as
probable causes (which generates diagnosis codes or trouble
symptoms.)
DGently shake the connector up, down and to the left and
right.
DGently shake the wiring harness up, down and to the
left and right. Check the branch point of wiring harness
connector closely.
DGently rock each sensor and relay, etc. by hand.
DGently shake the wiring harness at suspensions and other
moving parts.
NOTE
If determining the cause is difficult, the flight recorder function
of the MUT-IIcan also be used.
Fuse
Battery
Load
switch
Load
Short circuit
occurrence
section