1996 TOYOTA LAND CRUISER Cruise control

R13679
BatteryFL BLOCK 2
MAIN
W
W
ECU−B
1
F/B
S7
B−R
2
3
SRS Warning
Light
8LA
Tc
B−Y8
IH1 Airbag Sensor
Assembly
DLC1
5 W−L
11
GENERATOR
(ALTERNATOR)
W
Cruise Control ECU
W−L
W−L
B−Y
B−Y
IH1 S7 S6
S6
Short Connector
Short Connector W−L
B−L
11
12
3
EA3 11
22
7
DI−274
−
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
1996 LAND CRUISER (RM451U)
SRS Warning Light System Malfunction (Always lit up, when igni-
tion switch is in LOCK position.)
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
DI5QD−03
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DI5O4−02
Customer Problem Analysis
Check and Clear DTC (Precheck)
Vehicle Brought to Workshop
Problem Symptom Confirmation Symptom Simulation
Symptom
does not occur
DTC Check Normal code
DTC Chart Problem Symptom Table
Circuit Inspection Input Signal Check
Parts Inspection
Identification of Problem Repair
Confirmation Test
End Items inside
are titles of pages in this
manual with the page number indicated in the
bottom portion. See the indicated pages
for detailed explanations.
1
2
3 4
5
6 7
8 9
10 Step 2, 5, 8, 10: Diagnostic steps permitting the use
of the T OYOTA hand−held tester or
TOYOTA break −out− box.
P.
DI−285
P. DI−286
P. DI−286
P. DI−291
P. IN−18
P. DI−295
P. DI−306 − DI−310
OK NG
Symptom
occurs
Malfunction code
DI−284
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
451
Author: Date:
1996 LAND CRUISER (RM451U)
CRUISE CONTROL SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
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DI5O5−01
CRUISE CONTROL SYSTEM Check SheetInspector ’s name:
Customer ’s Name
Date of VehicleRegistration No.
Registration Year
Frame No.
Odometer Reading
/ / km
Mile
Condition of
Problem Occurrence
Date of Problem
How Often does
Occurrence
Problem Occur?
Vehicle Speed when
Problem Occurred / /
Continuous Intermittent ( Times a day)
km
Mile
Brought in
Auto cancel
occurs Driving condition  City driving  Freeway  Up hill  Down hill
 After cancel occurred, did the driver activate cruise control again?
 Yes  No
 Cancel does not
occur 
With brake ON
 Except D position shift  At 40 km/h (25 mph) or less
 When control SW turns to CANCEL position
 Cruise control
malfunction 
Slip to acceleration side
 Slip to deceleration side
 Hunting occurs
 O/D cut off does not occur
 O/D does not return
 Switch
malfunction 
SET  ACCEL  COAST  RESUME  CANCEL
 Remains ON  Does not light up  Blinking
Symptoms
DTC Check
1st Time2nd Time

Normal Code  Malfunction Code (Code )
 Normal Code  Malfunction Code (Code )

Cruise MAIN
indicator light
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−285
1996 LAND CRUISER (RM451U)
CUSTOMER PROBLEM ANALYSIS CHECK
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DI5O5−01
CRUISE CONTROL SYSTEM Check SheetInspector ’s name:
Customer ’s Name
Date of VehicleRegistration No.
Registration Year
Frame No.
Odometer Reading
/ / km
Mile
Condition of
Problem Occurrence
Date of Problem
How Often does
Occurrence
Problem Occur?
Vehicle Speed when
Problem Occurred / /
Continuous Intermittent ( Times a day)
km
Mile
Brought in
Auto cancel
occurs Driving condition  City driving  Freeway  Up hill  Down hill
 After cancel occurred, did the driver activate cruise control again?
 Yes  No
 Cancel does not
occur 
With brake ON
 Except D position shift  At 40 km/h (25 mph) or less
 When control SW turns to CANCEL position
 Cruise control
malfunction 
Slip to acceleration side
 Slip to deceleration side
 Hunting occurs
 O/D cut off does not occur
 O/D does not return
 Switch
malfunction 
SET  ACCEL  COAST  RESUME  CANCEL
 Remains ON  Does not light up  Blinking
Symptoms
DTC Check
1st Time2nd Time

Normal Code  Malfunction Code (Code )
 Normal Code  Malfunction Code (Code )

Cruise MAIN
indicator light
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−285
1996 LAND CRUISER (RM451U)
CUSTOMER PROBLEM ANALYSIS CHECK
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DI5O6-02
N06218CRUISE MAIN Indicator Light
BE4034
Indicator Light1.5 sec. 0.5 sec.
ON
OFF
N06219
TC
E1
DLC1
-
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI-286
1996 LAND CRUISER (RM451U)
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Check the indicator.
(1) Turn the ignition switch to ON.
(2) Check that the CRUISE MAIN indicator light comeson when the cruise control main switch is turned on,
and that the indicator light goes off when the main
switch is turned OFF.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting (See page BE-34) for the combination meter section.
(b) Check the DTC.
HINT:
If a malfunction occurs in the No. 1 vehicle speed sensors or ac-
tuator, etc. during cruise control driving, the ECU actuates
AUTO CANCEL of the cruise control and turns on and off the
CRUISE MAIN indicator light to inform the driver of a malfunc-
tion. At the same time, the malfunction is stopped in memory as
a diagnostic trouble code.
(c) Output of DTC using diagnosis check wire. (1) Turn the ignition switch ON.
(2) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843-18020
(3) Read the DTC on the CRUISE MAIN indicator light.
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BE4032
BE4033I00021
Normal Code
0.25 sec.
0.25 sec.
ON
OFF
ON
OFF
4 sec. 1.5 sec.
0.5 sec.
2.5 sec.0.5 sec.1.5 sec.
Malfunction codes 11 and 21
Code 11 Code 21
N09348
TOYOTA hand-held tester
TOYOTA Break-out-box
N18670
Instrument Panel Junction Block ECU- B
Fuse
DI-287
-
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
HINT:
If the DTC is not output, inspect the diagnosis circuit (See page
DI-333 )
As an example, the blinking patterns for codes; normal, 11 and
21 are shown in the illustration.
2. ECU TERMINAL VALUES MEASUREMENT BY USING TOYOTA BREAK-OUT-BOX AND TOYOTA HAND-
HELD TESTER
(a) Hook up the TOYOTA break- out- box and TOYOTA hand-held tester to the vehicle.
(b) Read the ECU input/output values by following the prompts on the tester screen.
(c) Please refer to the TOYOTA hand-held tester has a ºSnapshotº function. This records the measured data and
is effective in the diagnosis of intermittent problems.
3. DTC CLEARANCE
(a) After completing repairs, the diagnostic trouble code re- tained in memory can be cleared by removing the ECU-B
fuse for 10 seconds or more, with the ignition switch off.
(b) Check that the normal code is displayed after connecting the fuse.
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N14305
N14305
N14305
-
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI-288
1996 LAND CRUISER (RM451U)
4. PROBLEM SYMPTOM CONFIRMATION (ROAD TEST)
(a) Inspect the SET switch.
(1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) Press the control switch to the SET/COAST.
(4) After releasing the switch, check that the vehicle cruises at the desired speed.
(b) Inspect the ACCEL switch. (1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) Check that the vehicle speed is increased while the control switch turned to RES/ACC, and that the ve-
hicle cruises at the set speed when the switch is re-
leased.
(4) Momentarily press the control switch upward in the RES/ACC and then immediately release it. Check
that the vehicle speed increases by about 1.5 km/h
(Tap-up function).
(c) Inspect the COAST switch. (1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-er).
(3) Check that the vehicle speed is decreased while the
control switch is turned to SET/COAST, and the ve-
hicle cruise at the set speed when the switch is re-
leased.
(4) Momentarily press the control switch is turned to SET/COAST, and then immediately release it.
Check that the vehicle speed decreases by about
1.5 km/h (Tap-down function).
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N14305
N14305
DI-289
-
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
(d) Inspect the CANCEL switch. (1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-er).
(3) When operating one of the followings, check that the cruise control system is cancelled and that the
normal driving mode is reset.

Depress the brake pedal

Shift to except D position

Push the main switch OFF

Pull the cruise control switch to CANCEL
(e) Inspect the RESUME switch. (1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-er).
(3) When operating one of the followings, check that
the cruise control system is cancelled and that the
normal driving mode is reset.

Depress the brake pedal

Shift to except D position

Pull the cruise control switch to CANCEL
(4) After the control switch is turned to RES/ACC at the driving speed of more than 40 km/h (25 mph), check
that the vehicle restores the speed prior to the can-
cellation.
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