Toyota Sienna Service Manual: Short to B+ in Front Passenger Side Squib 2nd
Step Circuit
DTC B1188/56 Short to B+ in Front Passenger Side Squib 2nd
Step Circuit
DESCRIPTION
The front passenger side squib 2nd step circuit consists of the center airbag
sensor assembly and the
front passenger airbag assembly.
The circuit instructs the SRS to deploy when deployment conditions are met.
DTC B1188/56 is recorded when a short to B+ is detected in the front passenger
side squib 2nd step
circuit.
DTC No. |
DTC Detecting Condition |
Trouble Area |
B1188/56 |
- Short circuit in front passenger side squib 2nd step
wire harness (to B+)
- Front passenger side squib 2nd step malfunction
- Center airbag sensor assembly malfunction
|
- Front passenger airbag assembly (Front passenger
side squib 2nd step)
- Center airbag sensor assembly
- Instrument panel wire
|
INSPECTION PROCEDURE
HINT:
- Perform the simulation method by selecting the "check mode"
(signal check) with the intelligent tester
(8).
- After selecting the "check mode" (signal check), perform the
simulation method by wiggling each
connector of the airbag system or driving the vehicle on a city or rough
road
1 CHECK FRONT PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB 2ND
STEP)
![CHECK FRONT PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB 2ND STEP)](images/books/424/44/index.158.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 connectors from the front passenger
airbag assembly.
- Connect the black wire side of SST (resistance 2.1 Ω) to
the instrument panel wire.
CAUTION:
Never connect a tester to the front passenger airbag
assembly (front passenger side squib 2nd step) for
measurement, as this may lead to a serious injury
due to airbag deployment.
NOTICE:
Do not forcibly insert the SST into the terminals of
the connector when connecting.
Insert the SST straight into the terminals of the
connector.
SST 09843-18060
- 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 (5).
- 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 (5).
OK:
DTC B1188/56 is not output.
HINT:
Codes other than DTC B1188/56 may be output at this
time, but they are not related to this check.
Go to step 2
![](images/books/424/44/index.204.gif)
REPLACE FRONT PASSENGER AIRBAG ASSEMBLY
2 CHECK INSTRUMENT PANEL WIRE (FRONT PASSENGER SIDE SQUIB 2ND STEP
CIRCUIT)
![CHECK INSTRUMENT PANEL WIRE (FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT)](images/books/424/44/index.159.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 SST (resistance 2.1 Ω) from the
instrument panel wire.
- Disconnect the connector from 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.
- Measure the voltage according to the value(s) in the
table below.
Standard voltage
![Standard voltage](images/books/424/44/index.160.jpg)
REPAIR OR REPLACE INSTRUMENT
PANEL
WIRE
![](images/books/424/44/index.206.gif)
3 CHECK CENTER AIRBAG SENSOR ASSEMBLY
![CHECK CENTER AIRBAG SENSOR ASSEMBLY](images/books/424/44/index.161.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 connectors to the front passenger airbag
assembly and 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 (5).
- 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 (5).
OK:
DTC B1188/56 is not output.
HINT:
Codes other than DTC B1188/56 may be output at this
time, but they are not related to this check.
REPLACE CENTER AIRBAG SENSOR
ASSEMBLY
![](images/books/424/44/index.208.gif)
USE SIMULATION METHOD TO CHECK
DTC B1187/55 Short to GND in Front Passenger Side Squib
2nd Step Circuit
DESCRIPTION
The front passenger side squib 2nd step circuit consists of the center airbag
sensor assembly and the
front p ...
DTC B1630/83 Short in Rear Curtain Shield Squib RH Circuit
DESCRIPTION
The rear curtain shield squib RH circuit consists of the center airbag sensor
assembly and the curtain
shield airbag assembl ...
Other materials:
Precaution
1. PRECAUTION
(a) Before inspecting and repairing the fuel system,
disconnect the cable from the negative (-) battery
terminal.
(b) Do not smoke or work near fire when handling the
fuel system.
(c) Keep gasoline away from rubber or leather parts.
2. DISCHARGE FUEL SYSTEM PRESSURE (*1)
...
Sleep Operation Failure of Occupant Classification
ECU
DTC B1796 Sleep Operation Failure of Occupant Classification
ECU
DESCRIPTION
During sleep mode, the occupant classification ECU reads the condition of
each sensor while the ignition
switch is off.
In this mode, if the occupant classification ECU detects an internal
malfunction, DTC B1796 ...
Data list
HINT:
Reading the DATA LIST displayed on an intelligent tester
enables values, including those of the switches, sensors,
and actuators, to be checked without removing any
parts. Reading the DATA LIST as the first step in
troubleshooting is one method to shorten diagnostic
time.
NOTICE: ...