1996 TOYOTA LAND CRUISER wiring

N14677
Fuse
DI−276
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
SRS Warning Light System Malfunction (Does not light up, when
ignition switch is turned to ACC or ON.)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the \
ignition switch is
turned from LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to\
inform the driver of the abnormality.
When terminals Tc and E1 of the DLC1 are connected, the DTC is displayed by the blinking\
of the SRS warn-
ing light.
WIRING DIAGRAM
Refer to page DI−274 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Check ECU−B Fuse.
PREPARATION:
Remove ECU−B fuse.
CHECK:
Check continuity of ECU −B fuse.
OK:
Continuity
HINT:
Fuse may be burnt out even if it appears to be OK during
visual inspection.
If fuse is OK, install it.
NG Go to step 5.
OK
2 Preparation. (See step 1 on page DI−271)
DI5QE−03
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R13680
Airbag Sensor
AssemblyTc7
B−L
IH1B−Y
11
3
Tc E 1
DLC1 BR−B
EC
S6
S7 11
B−Y
Short Connector 2
2
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
DI−279
1996 LAND CRUISER (RM451U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting terminals Tc and E1 of the DLC1 the airbag sensor assembly is set in the DTC output mode.
The DTCs are displayed by the blinking of the SRS warning light.
WIRING DIAGRAM
DI5QF−03
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DI5O9−02
I00410
C18
Vd−26−2−E
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−293
1996 LAND CRUISER (RM451U)
TERMINALS OF ECM
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
D ↔ GND (C18 −2 ↔ C18− 13)B−W ↔ BRShift to except D positionBelow 1 V
Shift to D position10 − 16 V
PI ↔ GND (C18 −7 ↔ C18− 13)G−Y ↔ BR
Ignition switch ON
Cruise control main switch ONBelow 1.2 V
Ignition switch ON
Cruise control main switch OFF10 − 16 V
TC ↔ GND
(C18− 8 ↔ C18− 13)B−Y ↔ BR
Ignition switch ON10 − 16 V
Ignition switch ON
Connect terminals TC and E1 of diagnostic check connectorBelow 1 V
OD ↔ GND
(C18− 9 ↔ C18− 13)G−O ↔ BR
During cruise control driving
OD switch ON.10 − 16 V
During cruise control driving
OD switch OFF (3rd driving)Below 1 V
L ↔ GND
(C18− 10 ↔ C18− 13)R ↔ BRDuring cruise control driving9 − 15 V
Except during cruise control drivingBelow 1 V
MC ↔ GND
(C18−11 ↔ C18− 13)L− R ↔ BR
During cruise control driving
COAST switch hold ON9 − 15 V
During cruise control driving
ACC switch hold ONBelow 1 V
MO ↔ GND
(C18− 12 ↔ C18− 13)L ↔ BR
During cruise control driving
ACC switch hold ON9 − 15 V
During cruise control driving
COAST switch hold ONBelow 1 V
GND ↔ Body Ground
(C18− 13 ↔ Body Ground)BR ↔ Body
GroundConstantBelow 1 V
B ↔ GND
(C18− 14 ↔ C18− 13)B−W ↔ BRIgnition switch ON10 − 16 V
BATT ↔ GND
(C18− 15 ↔ C18− 13)B−R ↔ BRConstant10 − 16 V
STP− ↔ GND
(C18− 16 ↔ C18− 13)G−W ↔ BRDepress brake pedal10 − 16 V
Release brake pedalBelow 1 V
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DI−294
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
Symbols (Terminals No.)
Wiring ColorConditionSTD Voltage (V)
CCS ↔
GND
(C18− 18 ↔ C18− 13)B−G ↔ BR
Ignition switch ON10 − 16 V
Ignition switch ON
CANCEL switch hold ON5.1 − 8.3 V
Ignition switch ON
SET/COAST switch hold ON2.4 − 4.0 V
Ignition switch ON
RES/ACC switch hold ON0.8 − 1.4 V
CMS ↔ GND
(C18− 19 ↔ C18− 13)Y−R ↔ BR
Ignition switch ON
Main switch ONBelow 1 V
Ignition switch ON
Main switch OFF10 − 16 V
SPD ↔ GND
(C18− 20 ↔ C18− 13)L− W ↔ BRIgnition switch ON4.7 − 5.2 V
During driving3 − 7 V
IDL ↔ GND
(C18− 21 ↔ C18− 13)G−W ↔ BR
Ignition switch ON
Throttle valve fully closedBelow 1 V
Ignition switch ON
Throttle valve fully opened10 − 16 V
ECT ↔ GND
(C18− 22 ↔ C18− 13)
ECT ↔ GND
(C18− 22 ↔ C18− 13)
G−R ↔ BR
During driving
Gear position O/DBelow 1 V
During driving
Gear position 3rd10 − 16 V
VR1 ↔ GND
(C18− 23 ↔ C18− 13)Y ↔ BRIgnition switch ON4.7 − 5.2 V
VR2 ↔ VR3
(C18− 24 ↔ C18− 25)Y−G ↔ Y−L
During cruise control driving1.0 − 4.7 V
Ignition switch ON
Actuator control plate fully opened4.2 − 4.7 V
Ignition switch ON
Actuator control plate fully closed1.0 − 1.2 V
VR3 ↔ GND
(C18− 25 ↔ C18− 13)Y−L ↔ BRConstantBelow 1 V
L− ↔ GND
(C18− 26 ↔ C18− 13) ↔ BRConstantBelow 1 V
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DI5OB−02
Duty Ratio =A + BA
x 100 (%)
ON
OFF A
B
1 cycle
I00488
Cruise Control ECU
MC
11
C17 MO
L
Cruise Control Actuator
L−RC17
7
6 12
C4
C4
DI−296
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
CIRCUIT INSPECTION
DTC 11 Actuator Motor Circuit
CIRCUIT DESCRIPTION
The actuator motor is operated by signals from the ECU. Acceleration and deceleration signals are trans-
mitted by changes in the Duty Ratio (See note below).
Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle. For e\
xample, if A is the period of continuity
in one cycle, and B is the period of non −continuity, then.
DTC No.Detection ItemTrouble Area
11Short in actuator motor circuit.
Actuator motor
 Harness or connector between cruise control ECU and
actuator motor
 Cruise control ECU
WIRING DIAGRAM
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I00489
Cruise Control ECUL
L−
W−B
1
5
4 3
2 R
1026
C4 Stop Light Switch
4
R−G
Cruise
Control Actuator
C17
C17
C17
C4S13
S13 S13
S13
G−O G−WF11F11
1
2
STOP
Instrument Panel Fuse Block
W
EA3
W
3
1
F8
Battery Fusible Link
FL MAIN
STP−
DI−298
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
DTC 12 Actuator Magnetic Clutch Circuit
CIRCUIT DESCRIPTION
This circuit turns on the magnetic clutch inside the actuator during cruise \
control operation according to the
signal from the ECU. If a malfunction occurs in the actuator or speed sensor, etc. during cruise control opera-
tion, the rotor shaft between the motor and control plate is released.
When the brake pedal is depressed, the stop light switch turns on, supplying electrical power to the stop light.
Power supply to the magnetic clutch is mechanically cut and the magnetic clut\
ch is turned OFF.
When driving downhill, if the vehicle speed exceeds the set speed by 15 km/h\
(9 mph), the ECU turns the
safety magnet clutch OFF. If the vehicle speed later drops to within 10 km/h (6 mph) above the\
set speed,
then cruise control at the set speed is resumed.
DTC No.Detection ItemTrouble Area
12 Short in actuator magnetic clutch circuit.
 Open (0.8 sec.) in actuator magnetic clutch circuit.
STOP Fuse
 Stop light switch
 Actuator magnetic clutch
 Harness or connector between cruise control ECU and
actuator magnetic clutch, actuator magnetic clutch and body
ground
 Cruise control ECU
WIRING DIAGRAM
DI5OC−02
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I00490
Cruise Control ECUVR1 VR2
VR3
23
24
25
Y
Y−G Y−L
1
2 3
C4
Cruise Control Actuator
C17
C17 C17
C4
C4
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−301
1996 LAND CRUISER (RM451U)
DTC 13 Actuator Position Sensor Circuit
CIRCUIT DESCRIPTION
The circuit detects the rotation position of the actuator control plate and\
sends a signal to the ECU.
DTC No.Detection ItemTrouble Area
13Position sensor detects abnormal voltage.
Actuator position sensor
 Harness or connector between cruise control ECU and
actuator position sensor
 Cruise control ECU
WIRING DIAGRAM
DI5OD−02
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I00054
54
(+)
(−)
DI−304
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
DTC 14 Actuator Mechanical Malfunction
CIRCUIT DESCRIPTION
The circuit detects the rotation position of the actuator control plate and\
sends a signal to the ECU.
DTC No.Detection ItemTrouble Area
14
 Open in actuator motor circuit.
 Position sensor signal valve does not change when the
motor operates.
Actuator lock: (motor, arm)
 Actuator motor
 Harness or connector between cruise control ECU and
actuator motor
 Cruise control ECU
WIRING DIAGRAM
See page DI−296 .
INSPECTION PROCEDURE
1 Check cruise control actuator arm locking operation
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the actuator connector.
CHECK:
(a) Connect the positive (+) lead from the battery to the termi-
nal 5 of actuator and the negative ( −) lead to terminal 4.
NOTICE:
Do not connect the high tension cables to the wrong bat-
tery terminal. You will damage the cruise control actuator.
(b) Move the control plate by hand.
OK:
Control plate does not move.
NG Replace cruise control actuator.
OK
DI5OE−02
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