Page 1697 of 3115
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
B1628/29RSCA 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
Page 1698 of 3115
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
Page 1699 of 3115
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
Page 1700 of 3115

AB0119H01369H10600H21234H21233
Combination
Meter
" uAirbag
Sensor
Assembly
ON
DLC3
CG TC" u
DTC B1628/29
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-919
111 2 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check airbag sensor assembly.
PREPARATION:
(a) Connect the airbag sensor assembly connector.
(b) Connect the combination meter connector.
(c) Connect the negative (-) terminal cable to the battery,
and wait at least for 2 seconds.
CHECK:
(a) Turn the ignition switch to ON, and wait at least for 10 se-
conds.
(b) Clear the DTC stored in memory (See page DI-692).
(c) Turn the ignition switch to LOCK, and wait at least for 10
seconds.
(d) Turn the ignition switch to ON, and wait at least for 10 se-
conds.
(e) Check the DTC (See page DI-692).
OK:
DTC B2628/29 is not output.
HINT:
Codes other than code B1628/29 may be output at this time, but
they are not relevant to this check.
NG Replace airbag sensor assembly.
OK
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.
Page 1701 of 3115
DI-920
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
111 3 Author: Date:
2004 LAND CRUISER (RM1071U)
The RSCA off indicator light does not come on when the RSCA off switch is
operating (Remains OFF).
1 Check voltage of combination meter.
PREPARATION:
Disconnect the combination meter connector.
CHECK:
Measure the voltage of the combination meter.
OK:
Voltage: 10 - 14 V
NG Check combination meter (See page BE-58).
OK
2 Check wire harness.
PREPARATION:
Disconnect the combination meter connector.
CHECK:
Measure the voltage between the body ground and RMSW on the combination meter side between the air-
bag sensor assembly and the combination meter.
OK:
Voltage: Below 1 V
NG Repair or replace wire harness.
OK
Page 1702 of 3115
AB0119H21169H21525
Airbag Sensor Assembly
ON
IG2
(+) (-)
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-921
111 4 Author: Date:
2004 LAND CRUISER (RM1071U)
3 Check wire harness.
PREPARATION:
(a) Disconnect the negative (-) terminal cable from the bat-
tery, and wait at least for 90 seconds.
(b) Connect the combination meter connector.
(c) Turn the ignition switch to LOCK, and wait at least for 90
seconds.
(d) Disconnect the airbag sensor assembly connector.
(e) Connect the negative (-) terminal cable to the battery,
and wait at least for 2 seconds.
CHECK:
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the body ground and IG2
on the airbag sensor assembly side.
OK:
Voltage: 10 - 14 V
NG Repair or replace wire harness.
OK
Page 1703 of 3115
AB0119H01369H10600H21234H21233
Combination
Meter
" uAirbag
Sensor
Assembly
ON
DLC3
CG TC" u
DTC B1628/29
DI-922
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
111 5 Author: Date:
2004 LAND CRUISER (RM1071U)
4 Check airbag sensor assembly.
PREPARATION:
Connect the airbag sensor assembly connector.
CHECK:
(a) Turn the ignition switch to ON, and wait at least for 10 se-
conds.
(b) Clear the DTC stored in memory (See page DI-692).
(c) Turn the ignition switch to LOCK, and wait at least for 10
seconds.
(d) Turn the ignition switch to ON, and wait at least for 10 se-
conds.
(e) Check the DTC (See page DI-692).
OK:
DTC B1628/29 is not output.
HINT:
Codes other than code B1628/29 may be output at this time, but
they are not relevant to this check.
NG Replace airbag sensor assembly.
OK
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.
Page 1704 of 3115

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