airbag off TOYOTA LAND CRUISER 1986 Factory Repair Manual

Component to be alignedSection of repair manual for
relevant model
Front WheelsSuspension and Axle (SA) section
Rear WheelsSuspension and Axle (SA) section
Plopeller ShaftPropeller Shaft (PR) section
AIRBAG SENSOR ASSEMBLY

Never reuse the airbag sensor assembly involved in a collision when the SRS has deployed.

The connectors to the airbag sensor assembly should be connected or disconnected with the sensor
mounted on the floor. If the connectors are connected or disconnected while the airbag sensor as-
sembly is not mounted to the floor, it could cause undesired ignition of the supplemental restraint sys-
tem.

Work must be started after 90 seconds from the time the ignition switch is turned to the ºLOCKº posi-
tion and the negative (-) terminal cable is disconnected from the battery, even if only loosening the
set bolts of the airbag sensor assembly.
WIRE HARNESS AND CONNECTOR

The SRS wire harness is integrated with the cowl wire harness assembly and floor wire harness as-
sembly. The wires for the SRS wire harness are encased in a yellow corrugated tube. All the connec-
tors for the system are also a standard yellow color. If the SRS wire harness becomes disconnected
or the connector becomes broken due to an accident, etc., repair or replace it as shown on page.
2. BRAKE SYSTEM
The brake system is one of the most important safety components. Always follow the directions and
notes given in section BR of the repair manual for the relevant model year when handling brake sys-
tem parts.
NOTICE: When repairing the brake master cylinder or TRAC system, bleed the air out of the TRAC
system.
3. DRIVE TRAIN AND CHASSIS
The drive train and chassis are components that can have great effects on the running performance
and vibration resistance of the vehicle. After installing components in the sections listed in the table
below, perform alignments to ensure correct mounting angles and dimensions. Particularly accurate
repair of the body must also be done to ensure correct alignment.
HINT: Correct procedures and special tools are required for alignment. Always follow the directions
given in the repair manual for the relevant model during alignment and section Dl of this manual.
4. COMPONENTS ADJACENT TO THE BODY PANELS
Various types of component parts are mounted directly on or adjacently to the body panels. Strictly ob-
serve the following precautions to prevent damaging these components and the body panels during
handling.

Before repairing the body panels, remove their components or apply protective covers over the com-
ponents.

Before prying components off using a screwdriver or a scraper, etc., attach protective tape to the tool
tip or blade to prevent damaging the components and the body paint.

Before removing components from the outer surface of the body, attach protective tape to the body
to ensure no damage to painted areas.
HINT: Apply touch-up paint to any damaged paint surfaces.

Before drilling or cutting sections, make sure that there are no wires, etc. on the reverse side.
INTRODUCTIONIN-8

DI-916
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1109 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC B1628/29 RSCA off Switch Indicator Malfunction
CIRCUIT DESCRIPTION
The RSCA off switch is a mechanism that operates both right and left side of the curtain shield airbag assem-
bly and the seat belt pretensioner when the airbag sensor assembly detects a roll-over.
The RSCA off switch indicator light is installed in the combination meter.
As operating the RSCA off switch, the indicator light comes on to inform the driver that the roll-over detection
system is not working.
The initial setting of the roll-over detection system is on. It automatically operates every time the ignition
switch is turned on.
DTC No.DTC Detecting ConditionTrouble Area
B1628/29
RSCA off indicator circuit malfunction

RSCA off switch

Airbag sensor assembly

Dash wire

Instrument panel wire
HINT:
DTC B1628/29 is indicated only for the vehicle equipped with the side airbag.
DIB44-01

H21246
RMIL
C2625 Airbag Sensor Assembly
RMSW 21 B-W
3F 3Q69 2Cowl Side J/B RH
C26 3E4 MET
3Q7 SB
C CJ15
J/C
Combination Meter
C1210
SB
Cowl Side J/B LH
2A10
W-R2E 41
W-R
7
AM2 IG26 I18
Ignition SW
B-R
AA J4
J/CB-R
Engine Room J/B
1B9AM2
1C1
B-G F15
FL Block
MAIN
AA J12
J/C
2Q43G-W
Ia11
IU18
SB
IF13
3
IF211 4 SB
G-W
G-W
W-B RSCA Off C1319
B-R
SB J7
J/C
C C
SB SB
IFR40
RSCA Off Switch
2
BatteryCowl Side
J/B LH
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-917
111 0 Author
: Date
:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM

AB0117H01293H01295
LOCK
RMSW
DI-918
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1111 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
The RSCA off indicator light remains on when the RSCA off switch is not op-
erating (Remains ON).
1 Does indicator light turn off?
PREPARATION:
Disconnect the combination meter connector.
CHECK:
(a) Turn the ignition switch to ON.
(b) Check operation of RSCA off indicator light.
OK:
The indicator light does not light up.
NO Check combination meter (See page BE-58).
YES
2 Check wire harness.
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.
CHECK:
Measure the resistance between the body ground and RMSW
on the airbag sensor assembly side between the combination
meter and airbag sensor assembly.
OK:
Resistance: 1 MW or Higher
NG Repair or replace wire harness.
OK

H21247
Airbag Sensor
Assembly
C26IG2 5
B-R
3F3 IGN
3E4Cowl Side J/B RH
AB-R
AJ4
J/C
B-R
6 7
W-RCowl Side J/B LH
2E
2A 41 10
BatteryF15
FL Block
MAINB-G Engine Room J/B
1C 1B1 9AM2
W-R I18
Ignition SW
2 AM2 IG2
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-923
111 6 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC Normal Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly in
case the source voltage drops.
When the battery voltage drops, the voltage-increase circuit (DC-DC converter) functions to increase the
voltage of the SRS to normal voltage.
The diagnosis system malfunction display for this circuit is differ from the other circuits in that when the SRS
warning light remains on and the DTC shows a normal code, source voltage drop is indicated.
Malfunction in this circuit is not recorded in the airbag sensor assembly, and when the source voltage returns
to normal, the SRS warning light automatically goes off.
DTC No.Diagnosis
(Normal)Source voltage drop
WIRING DIAGRAM
DI8FC-09

H01249
ON
DI-926
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
111 9 Author
: Date
:
2004 LAND CRUISER (RM1071U)
4 Does SRS warning light turn off?
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Connect the steering wheel pad connector.
(c) Connect the front passenger airbag assembly connector.
(d) w/ Side airbag:
Connect the side airbag assembly connectors.
(e) Connect the seat belt pretensioner connectors.
(f) Connect the airbag sensor assembly connectors.
(g) Connect the front airbag sensor connectors.
(h) w/ Side airbag:
Connect the side and curtain shield airbag sensor assem-
bly connectors.
(i) w/ Side airbag:
Connect the curtain shield airbag assembly connectors.
(j) w/ Side airbag:
Connect the curtain shield airbag sensor assembly con-
nectors.
(k) Connect the seat position sensor assembly connector.
(l) Connect the front seat inner belt LH connector.
CHECK:
(a) Turn the ignition switch to ON.
(b) Operate electric system (defogger, wiper, headlight, heat-
er blower, etc.) and check that SRS warning light goes off.
NO Check for DTCs. If a DTC is output, perform trou-
bleshooting for the DTC. If a normal code is out-
put, replace airbag sensor assembly.
YES
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.

H21248
BatteryAirbag Sensor
Assembly
B-Y
LA
IG2 AM2
W-R41 Combination Meter
1011
3Q8
2A 2EB-Y
3F
C14Cowl Side J/B RH
MET
B-RC26
63
4
3E 7
3Q 4
C12 A/B
10
MAIN 2A
J4
J/C SB
B-G Cowl Side J/B LH
Engine Room J/B
1
1B1C 9AM23E 11 D7
DLC3
11
F15
FL Block W-R
7B-R
AA SRSSB
I18
Ignition SW
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-927
1120 Author
: Date
:
2004 LAND CRUISER (RM1071U)
SRS Warning Light Circuit Malfunction
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light comes on for approx. 6 seconds after the ignition switch
is turned from the LOCK position to 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 terminal TC and CG of the DLC3 are connected, the DTC is indicated by blinking the SRS warning
light.
WIRING DIAGRAM
DIB45-01

AB0117H01293H01295
Airbag Sensor Assembly
LOCK
DI-928
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1121 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
Always lights up, when ignition switch is in LOCK position.
1 Prepare for inspection (See step 1 on page DI-923).
2 Does SRS warning light turn off?
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) Connect the negative (-) terminal cable to the battery.
CHECK:
Check operation of SRS warning light.
NO Check combination mater (See page BE-2).
YES
Replace airbag sensor assembly.

DI-704
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
897 Author
: Date
:
2004 LAND CRUISER (RM1071U)B1183/22
(DI-898)

Short in D squib (2nd step) circuit
(to B+)
Steering wheel pad (D squib, 2nd step)

Spiral cable

Airbag sensor assembly

Dash wire

Column wire
ON
B1185/57
(DI-903)
Short in P squib (2nd step) circuit
Front passenger airbag assembly (squib)

Airbag sensor assembly

Dash wire
ON
B1186/58
(DI-907)
Open in P squib (2nd step) circuit
Front passenger airbag assembly (squib)

Airbag sensor assembly

Dash wire
ON
B1187/55
(DI-910)
Short in P squib (2nd step) circuit
(to ground)
Front passenger airbag assembly (squib)

Airbag sensor assembly

Dash wire
ON
B1188/56
(DI-913)
Short in P squib (2nd step) circuit
(to B+)
Front passenger airbag assembly (squib)

Airbag sensor assembly

Dash wire
ON
B1628/29
(*1)
(DI-913)
RSCA cutoff switch indicator
RSCA cutoff switch

Airbag sensor assembly

Dash wire

Instrument panel wire
Blink
Nl
System normal-OFFNormal
(DI-923)
Voltage source drop
Battery

Airbag sensor assemblyON
*1: w/ Side Airbag
HINT:

When the SRS warning light remains lit up and the DTC is the normal code, a voltage source drop is
possible.
This malfunction is not stored in memory by the airbag sensor assembly and if the power source volt-
age returns to normal, the SRS warning light will automatically go out.

When 2 or more codes are indicated, smaller numbered code will be shown first.

If a code not listed on the chart is displayed, the airbag sensor assembly is at fault.

In the case of any malfunction concerning any open circuit, ground short, or B+ short due to any squib,
another malfunction code may not be detected. In this case, correct the malfunction currently indicated
and then perform malfunction diagnosis again. Another malfunction code may then be detected.

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.