Toyota Sienna Service Manual: Passenger Airbag ON/OFF Indicator Circuit
Malfunction
DTC B1152/28 Passenger Airbag ON/OFF Indicator Circuit
Malfunction
DESCRIPTION
![DESCRIPTION](images/books/424/79/index316.jpg)
The passenger airbag ON/OFF indicator circuit consists of the center airbag
sensor assembly and
passenger airbag ON/OFF indicator.
This circuit indicates the operation condition of the front passenger airbag,
the front seat side airbag RH
and front seat belt pretensioner RH.
DTC B1152/28 is recorded when a malfunction is detected in the passenger airbag
ON/OFF indicator
circuit.
WIRING DIAGRAM
![WIRING DIAGRAM](images/books/424/79/index317.jpg)
INSPECTION PROCEDURE
1 CHECK PASSENGER AIRBAG ON/OFF INDICATOR OPERATION
- Turn the ignition switch to the ON position.
- Check the passenger airbag ON/OFF indicator
operation.
HINT:
Refer to the normal condition of the passenger airbag
ON/OFF indicator
![CHECK PASSENGER AIRBAG ON/OFF INDICATOR OPERATION](images/books/424/79/index318.jpg)
Result
![Result](images/books/424/79/index319.jpg)
2 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 air conditioning
control assembly.
OK:
The connectors are connected.
3 CHECK CONNECTORS
- Disconnect the connectors from the center airbag sensor
assembly and the air conditioning control assembly.
- Check that the connectors (on the center airbag sensor
assembly side and the air conditioning control assembly
side) are not damaged.
OK:
The connectors are not deformed or damaged.
4 CHECK PASSENGER AIRBAG ON/OFF INDICATOR
![CHECK PASSENGER AIRBAG ON/OFF INDICATOR](images/books/424/79/index320.gif)
- Connect the connector to the center airbag sensor
assembly.
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch to the ON position.
- Check the passenger airbag ON/OFF indicator
operation.
OK:
The passenger airbag ON/OFF indicator ("ON" and
"OFF") does not come on.
5 CHECK CENTER AIRBAG SENSOR ASSEMBLY
![CHECK CENTER AIRBAG SENSOR ASSEMBLY](images/books/424/79/index321.jpg)
- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Connect the connector to the air conditioning control
assembly.
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- 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 B1152/28 is not output.
HINT:
Codes other than code B1152/28 may be output at this
time, but they are not related to this check.
USE SIMULATION METHOD TO CHECK
6 CHECK INSTRUMENT PANEL WIRE (OPEN)
![CHECK INSTRUMENT PANEL WIRE (OPEN)](images/books/424/79/index322.jpg)
- 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 connector from the center airbag sensor
assembly.
- Using a service wire, connect A21-1 (P-AB) and A21-25
(PAON) 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.
Automatic air conditioning:
Standard resistance
![Automatic air conditioning](images/books/424/79/index323.jpg)
Manual air conditioning:
Standard resistance
![Manual air conditioning](images/books/424/79/index324.jpg)
7 CHECK INSTRUMENT PANEL WIRE (SHORT)
![CHECK INSTRUMENT PANEL WIRE (SHORT)](images/books/424/79/index325.jpg)
- Disconnect the service wire from connector "B".
- Measure the resistance according to the value(s) in the
table below.
Automatic air conditioning:
Standard resistance
![Automatic air conditioning](images/books/424/79/index326.jpg)
Manual air conditioning:
Standard resistance
![Manual air conditioning](images/books/424/79/index327.jpg)
8 CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)
![CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)](images/books/424/79/index328.jpg)
- Measure the resistance according to the value(s) in the
table below.
Automatic air conditioning:
Standard resistance
![Automatic air conditioning](images/books/424/79/index329.jpg)
Manual air conditioning:
Standard resistance
![Manual air conditioning](images/books/424/79/index330.jpg)
9 CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)
![CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)](images/books/424/79/index331.jpg)
- 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.
Automatic air conditioning:
Standard voltage
![Automatic air conditioning](images/books/424/79/index332.jpg)
Manual air conditioning:
Standard voltage
![Manual air conditioning:](images/books/424/79/index333.jpg)
REPLACE AIR CONDITIONING CONTROL ASSEMBLY
10 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 air conditioning
control assembly.
OK:
The connectors are connected
11 CHECK CONNECTORS
- Disconnect the connectors from the center airbag sensor
assembly and the air conditioning control assembly.
- Check that the connectors (on the center airbag sensor
assembly side and the air conditioning control assembly
side) are not damaged.
OK:
The connectors are not deformed or damaged.
12 CHECK INSTRUMENT PANEL WIRE (OPEN)
![CHECK INSTRUMENT PANEL WIRE (OPEN)](images/books/424/79/index334.jpg)
- Using a service wire, connect A21-1 (ABON) and A21-25
(ABOF) of connector "B".
- Measure the resistance according to the value(s) in the
table below.
Automatic air conditioning:
Standard resistance
![Automatic air conditioning](images/books/424/79/index335.jpg)
Manual air conditioning:
Standard resistance
![Manual air conditioning](images/books/424/79/index336.jpg)
13 CHECK INSTRUMENT PANEL WIRE (SHORT)
![CHECK INSTRUMENT PANEL WIRE (SHORT)](images/books/424/79/index337.jpg)
- Disconnect the service wire from connector "B".
- Measure the resistance according to the value(s) in the
table below.
Automatic air conditioning:
Standard resistance
![Automatic air conditioning](images/books/424/79/index338.jpg)
Manual air conditioning:
Standard resistance
![Manual air conditioning](images/books/424/79/index339.jpg)
14 CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)
![CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)](images/books/424/79/index340.jpg)
- Measure the resistance according to the value(s) in the
table below.
Automatic air conditioning:
Standard resistance
![Automatic air conditioning](images/books/424/79/index341.jpg)
Manual air conditioning:
Standard resistance
![Manual air conditioning](images/books/424/79/index342.jpg)
15 CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)
![CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)](images/books/424/79/index343.jpg)
- 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.
Automatic air conditioning:
Standard voltage
![Automatic air conditioning](images/books/424/79/index344.jpg)
Manual air conditioning:
Standard voltage
![Manual air conditioning](images/books/424/79/index345.jpg)
16 CHECK WIRE HARNESS (POWER SOURCE)
![CHECK WIRE HARNESS (POWER SOURCE)](images/books/424/79/index346.jpg)
- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Connect the connector to the center airbag sensor
assembly.
- Turn the ignition switch to the ON position.
- Measure the voltage and resistance according to the
value(s) in the table below.
Automatic air conditioning:
Standard voltage
![Automatic air conditioning](images/books/424/79/index347.jpg)
Manual air conditioning:
Standard voltage
![Manual air conditioning](images/books/424/79/index348.jpg)
17 CHECK PASSENGER AIRBAG ON/OFF INDICATOR
![CHECK PASSENGER AIRBAG ON/OFF INDICATOR](images/books/424/79/index349.jpg)
- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Connect the connector to the air conditioning control
assembly.
- Disconnect the connector from center airbag sensor
assembly.
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch to the ON position.
- Check the passenger airbag ON/OFF indicator condition.
Result
![Result](images/books/424/79/index350.jpg)
18 CHECK CENTER AIRBAG SENSOR ASSEMBLY
![CHECK CENTER AIRBAG SENSOR ASSEMBLY](images/books/424/79/index351.jpg)
- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Connect the connector to the center airbag sensor
assembly.
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- 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 B1152/28 is not output.
HINT:
Codes other than code B1152/28 may be output at this
time, but they are not related to this check.
USE SIMULATION METHOD TO CHECK
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...
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Other materials:
Diagnostic trouble code chart
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If a malfunction code is displayed during the DTC check,
check the circuit listed for the code in the table below
(Proceed to the page listed for that circuit).
HINT:
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DESCRIPTION
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