Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM100000000VJRK |
Model Year Start: 2016 |
Model: Sienna |
Prod Date Range: [12/2015 -
] |
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1940/75-B1943/75; Short in Selectable Force Limiter Squib RH Circuit; 2016 - 2020 MY Sienna [12/2015 - ] |
DTC
|
B1940/75
|
Short in Selectable Force Limiter Squib RH Circuit
|
DTC
|
B1941/75
|
Open in Selectable Force Limiter Squib RH Circuit
|
DTC
|
B1942/75
|
Short to GND in Selectable Force Limiter Squib RH Circuit
|
DTC
|
B1943/75
|
Short to +B in Selectable Force Limiter Squib RH Circuit
|
DESCRIPTION
The selectable force limiter squib RH circuit consists of the center airbag sensor assembly and front seat outer belt assembly RH.
The center airbag sensor assembly uses this circuit to deploy the selectable force limiter when deployment conditions are met.
These DTCs are stored when a malfunction is detected in the selectable force limiter squib RH circuit.
DTC No.
|
DTC Detection Condition
|
Trouble Area
|
B1940/ 75
|
-
The center airbag sensor assembly detects a line short in the selectable force limiter squib RH circuit during primary check.
-
Selectable force limiter squib RH malfunction
-
Center airbag sensor assembly malfunction
|
-
Floor wire
-
Selectable force limiter squib RH (Front seat outer belt assembly RH)
-
Center airbag sensor assembly
|
B1941/ 75
|
-
The center airbag sensor assembly detects an open in the selectable force limiter squib RH circuit.
-
Selectable force limiter squib RH malfunction
-
Center airbag sensor assembly malfunction
|
-
Floor wire
-
Selectable force limiter squib RH (Front seat outer belt assembly RH)
-
Center airbag sensor assembly
|
B1942/ 75
|
-
The center airbag sensor assembly detects a short to ground in the selectable force limiter squib RH circuit.
-
Selectable force limiter squib RH malfunction
-
Center airbag sensor assembly malfunction
|
-
Floor wire
-
Selectable force limiter squib RH (Front seat outer belt assembly RH)
-
Center airbag sensor assembly
|
B1943/ 75
|
-
The center airbag sensor assembly detects a short to B+ in the selectable force limiter squib RH circuit.
-
Selectable force limiter squib RH malfunction
-
Center airbag sensor assembly malfunction
|
-
Floor wire
-
Selectable force limiter squib RH (Front seat outer belt assembly RH)
-
Center airbag sensor assembly
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
PROCEDURE
(a) Turn the ignition switch off.
Text in Illustration
*1
|
Front Seat Outer Belt Assembly RH
|
*2
|
Center Airbag Sensor Assembly
|
*3
|
Floor Wire
|
|
|
(b) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
(c) Check that the connectors are properly connected to the front seat outer belt assembly RH and center airbag sensor assembly.
OK:
The connectors are properly connected.
HINT:
If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.
(d) Disconnect the connectors from the front seat outer belt assembly RH and center airbag sensor assembly.
(e) Check that the terminals of the connectors are not damaged.
OK:
The terminals are not deformed or damaged.
(f) Check that the floor wire connector (on the front seat outer belt assembly RH side) is not damaged.
OK:
The connector locking button is not disengaged, and the claw of the lock is not deformed or damaged.
(g) Check that the short spring for the floor wire with the activation prevention mechanism is not deformed or damaged.
OK:
The short spring is not deformed or damaged.
NG |
|
REPLACE FLOOR WIRE
|
OK
|
|
|
2.
|
CHECK FRONT SEAT OUTER BELT ASSEMBLY RH
|
(a) Connect the connector to the center airbag sensor assembly.
Text in Illustration
*1
|
Front Seat Outer Belt Assembly RH
|
*2
|
Center Airbag Sensor Assembly
|
*a
|
Front view of wire harness connector (to Front Seat Outer Belt Assembly RH)
|
|
|
(b) Connect SST (resistance 2.1 Ω) to connector C.
CAUTION:
Never connect a tester to the front seat outer belt assembly RH for measurement, as this may lead to a serious injury due to pretensioner deployment.
NOTICE:
-
Do not forcibly insert SST into the terminals of the connector when connecting it.
-
Insert SST straight into the terminals of the connector.
SST: 09843-18061
(c) Connect the cable to the negative (-) battery terminal.
(d) Clear the DTCs stored in memory (See page
).
(e) Turn the ignition switch off.
(f) Turn the ignition switch to ON, and wait for at least 60 seconds.
(g) Check for DTCs (See page
).
OK:
DTC B1940/75, B1941/75, B1942/75 or B1943/75 is not output.
HINT:
Codes other than DTCs B1940/75, B1941/75, B1942/75 and B1943/75 may be output at this time, but they are not related to this check.
(h) Turn the ignition switch off.
(i) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
(j) Disconnect SST from connector C.
OK |
|
REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH
|
NG
|
|
|
(a) Disconnect the floor wire from the center airbag sensor assembly.
|
|
(b) Check for a short to B+ in the circuit.
(1) Connect the cable to the negative (-) battery terminal.
(2) Turn the ignition switch to ON.
(3) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Switch Condition
|
Specified Condition
|
L49-1 (SR+) - Body ground
|
Ignition switch ON
|
Below 1 V
|
L49-2 (SR-) - Body ground
|
Ignition switch ON
|
Below 1 V
|
Text in Illustration
*1
|
Front Seat Outer Belt Assembly RH
|
*2
|
Center Airbag Sensor Assembly
|
*3
|
Floor Wire
|
*a
|
Front view of wire harness connector (to Front Seat Outer Belt Assembly RH)
|
(4) Turn the ignition switch off.
(5) Disconnect the cable from the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
(c) Check for an open in the circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
L49-1 (SR+) - L49-2 (SR-)
|
Always
|
Below 1 Ω
|
(d) Check for a short to ground in the circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
L49-1 (SR+) - Body ground
|
Always
|
1 MΩ or higher
|
L49-2 (SR-) - Body ground
|
Always
|
1 MΩ or higher
|
(e) Check for a short in the circuit.
(1) Release the activation prevention mechanism built into connector B (See page
).
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
L49-1 (SR+) - L49-2 (SR-)
|
Always
|
1 MΩ or higher
|
(3) Restore the released activation prevention mechanism of connector B to the original condition.
NG |
|
REPLACE FLOOR WIRE
|
OK
|
|
|
(a) Connect the connectors to the front seat outer belt assembly RH and center airbag sensor assembly.
Text in Illustration
*1
|
Front Seat Outer Belt Assembly RH
|
*2
|
Center Airbag Sensor Assembly
|
|
|
(b) Connect the cable to the negative (-) battery terminal.
(c) Clear the DTCs stored in memory (See page
).
(d) Turn the ignition switch off.
(e) Turn the ignition switch to ON, and wait for at least 60 seconds.
(f) Check for DTCs (See page
).
OK:
DTC B1940/75, B1941/75, B1942/75 or B1943/75 is not output.
HINT:
Codes other than DTCs B1940/75, B1941/75, B1942/75 and B1943/75 may be output at this time, but they are not related to this check.
OK |
|
USE SIMULATION METHOD TO CHECK
|
NG |
|
REPLACE CENTER AIRBAG SENSOR ASSEMBLY
|
|