1986 TOYOTA LAND CRUISER ignition

AB0119H10689H10656
ON
TC
(+)
(-)
AB0117 AB0119H01302H12918
LOCK
ON
Airbag Sensor Assembly
TC
DI-934
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1127 Author
: Date
:
2004 LAND CRUISER (RM1071U)
3 Check voltage between terminal TC of DLC3 and body ground.
CHECK:
Measure the voltage between the body ground and terminal TC
of DLC3.
OK:
Voltage: 4 - 14 V
OK Check harness between terminal CG of DLC3
and body ground.
NG
4 Check airbag sensor assembly.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect the negative (-) terminal cable from the bat-
tery, and wait at least for 90 seconds.
(c) Disconnect the airbag sensor assembly connector.
(d) Insert the service wire into terminal TC from back side as
shown in the illustration.
(e) Connect the airbag sensor assembly connector with ser-
vice wire.
(f) Connect the negative (-) terminal cable to the battery.
(g) Turn the ignition switch to ON and wait at least for 20 se-
conds.
(h) Connect the service wire of terminal TC to body ground.
CHECK:
Check operation of SRS warning light.
OK:
SRS waning light comes on.
NOTICE:
Pay due attention to the terminal connecting position to
avoid a malfunction.
OK Check harness between the airbag sensor as-
sembly and DLC3.
NG
Replace airbag sensor assembly.

AB0119H01304H01305
LOCKAirbag Sensor Assembly
TC
(+)
(-)
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-935
1128 Author
: Date
:
2004 LAND CRUISER (RM1071U)
If the DTC is displayed without a DTC check procedure, perform the following
troubleshooting.
1 Check resistance between terminal TC of airbag sensor assembly and body
ground.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least for 90 seconds.
(c) Disconnect the airbag sensor assembly connector.
CHECK:
Check resistance between terminal TC of the airbag sensor as-
sembly connector and body ground.
OK:
Resistance: 1 MW or Higher
NG Repair or replace harness or connector.
OK
Replace airbag sensor assembly.

DIB3P-01
A04550
13 9 14 10 15 11 16 1251 62 73 84
DLC3
H20916
DI-692
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
885 Author
: Date
:
2004 LAND CRUISER (RM1071U)
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Check the DLC3.
HINT:
The vehicle's ECM uses ISO 9141-2 for communication. The
terminal arrangement of the DLC3 complies with SAE J1962
and matches the ISO 9141-2 format.
Terminal No.Connection/Voltage or ResistanceCondition
7Bus
Line/Pulse generationDuring Transmission
4Chassis Ground e Body Ground/1 W or lessAlways
16Battery Positive e Body Ground/ 9 - 14 VAlways
HINT:
If your display shows UNABLE TO CONNECT TO VEHICLE
when you have connected the cable of the OBD II scan tool or
TOYOTA hand-held tester to the DLC3, turned the ignition
switch ON and operated the scan tool, there is a problem on the
vehicle side or tool side.

If communication is normal when the tool is con-
nected to another vehicle, inspect the DLC3 on the
original vehicle.

If communication is still not possible when the tool
is connected to another vehicle, the problem is
probably in the tool itself, so consult the Service De-
partment listed in the tool's instruction manual.
2. SRS WARNING LIGHT CHECK
(a) Turn the ignition switch to ON, and check that the SRS
warning light comes on.
(b) Check that the SRS warning light goes out after approx.
6 seconds.
HINT:

When the ignition switch is at ON and the SRS warning
light remains on or flashes, the airbag sensor assembly
has detected a malfunction code.

If, after approx. 6 seconds have elapsed, the SRS warn-
ing light sometimes comes on even when the ignition
switch is OFF. In this case, a short in the SRS warning light
circuit is possible. Proceed to ºSRS warning light circuit
malfunctionº on page DI-927.

H10658
DLC3
CG TC
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-693
886 Author
: Date
:
2004 LAND CRUISER (RM1071U)
3. DTC CHECK (Using diagnosis check wire)
(a) Present troubles codes:
Output the DTC.
(1) Turn the ignition switch to ON, and wait for approx.
60 seconds.
(2) Using SST, connect terminal TC and CG of the
DLC3.
SST 09843-18040
NOTICE:
Pay attention to the terminal connecting position to avoid
a malfunction.
(b) Past troubles codes:
Output the DTC.
(1) Using SST, connect terminal TC and CG of the
DLC3.
SST 09843-18040
(2) Turn the ignition switch to ON, and wait for approx.
60 seconds.
NOTICE:
Pay attention to the terminal connecting position to avoid
a malfunction.

H13050
0.5
2.5 4.0
1.50.5
DTC 11
DTC 31Repeat 0.75
ON
OFF0.25 0.25
ON
OFF
0.25 Normal Code (w/o Past Trouble Code)
Normal Code (w/ Past Trouble Code)
Malfunction Code
(Example Code 11 and 13)
I24672
TOYOTA Hand-held Tester
DLC3
DI-694
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
887 Author
: Date
:
2004 LAND CRUISER (RM1071U)
(c) Read the DTC.
Read the DTC by counting the blinking times. As an ex-
ample, the blinking patterns of normal, 11 and 31 are
shown in the illustration.

Normal code indication (w/o past trouble
code)
The light blinks 2 times per seconds.

Normal code indication (w/ past trouble code)
When the past troubles code is stored in the
airbag sensor assembly, the light blinks only
ones a second.

Malfunction code indication
The first blinking indicates the first DTC. Se-
cond blinking occurs after 1.5- second of
pausing.
If there are 2 or more codes, there will be a 2.5-second pause
between each code. After all the codes are shown, there will be
a 4.0-second pausing, and they will all be repeated.
HINT:

If 2 or more malfunctions are found, the indication starts
from the smaller numbered code.

If the light does not blink or comes out at all, or if DTCs are
indicated without a connection of the terminals, proceed
to the TC terminal circuit inspection on page DI-932.
4. DTC CHECK (Using TOYOTA hand-held tester)
(a) Hook up the TOYOTA hand-held tester to the DLC3.
(b) Read the DTCs by following the prompts on the tester
screen.
HINT:
Please refer to the TOYOTA hand-held tester operator's manu-
al for further details.
5. DTC CLEARANCE (Not using service wire)
When the ignition switch is turned OFF, the diagnostic trouble
code is cleared.
HINT:
Depending on the DTC, the code might not be cleared by turn-
ing the ignition switch OFF.
In this case, proceed to the next step.
6. DTC CLEARANCE (Using service wire)
(a) Connect the service wire to terminal TC of the DLC3.
(b) Ground terminal TC of the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Within 3 to 10 sec. after DTC is started to be output, re-
lease ground from terminal TC of the DLC3.
(e) The SRS warning light comes on 2 to 4 sec. later. Within
1 to 5 sec. after that, ground terminal TC of the DLC3.
(f) The SRS warning light goes off 2 to 4 sec. after grounding
terminal TC. Within 1 to 5 sec. after that, release ground
from terminal TC again.

DI8ES-03
DI-710
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
903 Author
: Date
:
2004 LAND CRUISER (RM1071U)
PROBLEM SYMPTOMS TABLE
Proceed with troubleshooting of each circuit in the table below.
SymptomSuspected AreaSee page

With the ignition switch in ON position, the SRS warning light
sometimes lights up after approx. 6 seconds have elapsed.

SRS warning light is always lit up even when ignition switch is in
the LOCK position.
SRS warning light circuitDI-927

With the ignition switch in ON position, the SRS warning light
does not light up.

DTC is not displayed.

SRS warning light is always lit up at the time of DTC check pro-
cedure.
TC terminal circuitDI-932

DTC is displayed without TC and CG terminal connection.

I27341
U1
Unlock Warning SWCowl Side J/B RH
Cowl Side J/B LHTheft Deterrent ECU
R-B
W-BW-BR-BKSW 12
T5 3Q 74 23
3E
3
3P1
3P
2E 18
IF 1
2
SB9
IL3
DI-974
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1167 Author
: Date
:
2004 LAND CRUISER (RM1071U)
Key unlock warning switch circuit
CIRCUIT DESCRIPTION
The key unlock warning switch goes on when the ignition key is inserted the key cylinder and goes off when
the ignition key is removed.
The ECU operates the key confinement prevention function while the key unlock warning switch is ON.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
In case of using the hand-held tester, start the inspection from step 1 and in case of not using the hand-held
tester, start from step 2.
1 Check unlock warning switch using hand-held tester.
PREPARATION:
Connect the hand-held tester to DLC 3.
CHECK:
Check that the unlock warning switch operate in DATA LIST (See page DI-1040).
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-965).
NG
DIB4W-02

DIB4S-02
DI-966
- DIAGNOSTICSTHEFT DETERRENT SYSTEM
1159 Author
: Date
:
2004 LAND CRUISER (RM1071U)
CIRCUIT INSPECTION
Power source circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned to the ACC position, battery positive voltage is applied to the terminal ACC
of the ECU.
Also, if the ignition switch is turned to the ON position, battery positive voltage is applied to the terminals ACC
and IG of the ECU.
When the battery positive voltage is applied to the terminal IG of the ECU while the theft deterrent system
is activated, the warning stops.
Furthermore, power supplied from the terminals ACC and IG of the ECU is used as power for the door courte-
sy switch, position switch, etc.