Toyota Sienna Service Manual: Occupant Classification System Malfunction
DTC B1150/23 Occupant Classification System Malfunction
DESCRIPTION
The occupant classification system circuit consists of the center airbag
sensor assembly and the occupant
classification ECU.
If the center airbag sensor assembly receives signals from the occupant
classification ECU, it determines
whether or not the front passenger airbag, the front seat side airbag RH, and
front seat belt pretensioner
RH should be operated.
DTC B1150/23 is recorded when a malfunction is detected in the occupant
classification system circuit.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 CHECK DTC (OCCUPANT CLASSIFICATION ECU)
- Turn the ignition switch to the ON position, and wait for at
least 10 seconds.
- Using the intelligent tester, check the DTCs of the
occupant classification ECU.
OK:
DTC is not output
2 CHECK DTC (CENTER AIRBAG SENSOR ASSEMBLY)
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Clear the DTCs stored in memory.
- Turn the ignition switch to the LOCK position.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Check the DTCs.
OK:
DTC B1150/23 is not output.
HINT:
Codes other than code B1150/23 may be output at this
time, but they are not related to this check.
USE SIMULATION METHOD TO CHECK
3 CHECK CONNECTION OF CONNECTORS
- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Check that the connectors are properly connected to the
center airbag sensor assembly and the occupant
classification ECU.
OK:
The connectors are connected.
4 CHECK OCCUPANT CLASSIFICATION ECU CIRCUIT (SHORT TO GROUND)
- Disconnect the connectors from the center airbag sensor
assembly and the occupant classification ECU.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance
5 CHECK OCCUPANT CLASSIFICATION ECU CIRCUIT (SHORT TO B+)
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch to the ON position.
- Measure the voltage according to the value(s) in the
table below.
Standard voltage
6 CHECK OCCUPANT CLASSIFICATION ECU CIRCUIT (SHORT)
- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance
7 CHECK OCCUPANT CLASSIFICATION ECU CIRCUIT (OPEN)
- w/ Side airbag:
Using a service wire, connect A22-1 (FSR+) and A22-2
(FSR-) of connector "B".
NOTICE:
Do not forcibly insert a service wire into the
terminals of the connector when connecting.
- w/o Side airbag:
Using a service wire, connect A22-3 (FSR+) and A22-10
(FSR-) of connector "B".
NOTICE:
Do not forcibly insert a service wire into the
terminals of the connector when connecting.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance
8 CHECK FRONT SEAT WIRE RH (SHORT TO GROUND)
- Disconnect the front seat wire RH connector from the
floor wire No. 2.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance
REPAIR OR REPLACE FLOOR WIRE NO.2
9 CHECK FRONT SEAT WIRE RH (SHORT TO B+)
- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Disconnect the front seat wire RH connector from the
floor wire No. 2.
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch to the ON position.
- Measure the voltage according to the value(s) in the
table below.
Standard voltage
REPAIR OR REPLACE FLOOR WIRE NO.2
10 CHECK FRONT SEAT WIRE RH (SHORT)
- Disconnect the front seat wire RH connector from the
floor wire No. 2.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance
REPAIR OR REPLACE FLOOR WIRE NO.2
11 CHECK FRONT SEAT WIRE RH (OPEN)
- Disconnect the service wire from connector "B".
- Disconnect the front seat wire RH connector from the
floor wire No. 2.
- w/ Power seat:
Using a service wire, connect BO1-3 (FSR+) and BO1-5
(FSR-) of connector "D".
NOTICE:
Do not forcibly insert a service wire into the
terminals of the connector when connecting.
- w/o Power seat:
Using a service wire, connect BM1-3 (FSR+) and BM1-2
(FSR-) of connector "D".
NOTICE:
Do not forcibly insert a service wire into the
terminals of the connector when connecting.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance
REPAIR OR REPLACE FLOOR WIRE NO.2
DTC B1149/37 Front Airbag Sensor LH Circuit Malfunction
DESCRIPTION
The front airbag sensor LH circuit consists of the center airbag sensor
assembly and front airbag sensor
LH.
If the center a ...
DTC B1152/28 Passenger Airbag ON/OFF Indicator Circuit
Malfunction
DESCRIPTION
The passenger airbag ON/OFF indicator circuit consists of the center airbag
sensor assembly and
passenger airba ...
Other materials:
Jam Protection Function Activates During Power Slide Door LH
Operation
DESCRIPTION
It may be caused by ill-fitting slide door, faulty touch sensor or
faulty pulse sensor.
The power slide door ECU activates the slide motor to open / close
the power slide door, thus
controlling the power slide door operation. For jam and foreign object
detect ...
Command list
Some recognizable voice commands and their actions are shown
below as examples.
Basic
Command
Action
“Help”
Prompts voice guidance to offer examples of commands
or operation methods
“Go Back”
Returns to the previous screen
Phone
...
Transfer
SST
RECOMMENDED TOOLS
EQUIPMENT
LUBRICANT
SSM
...