Toyota Sienna Service Manual: Open in Driver Side Squib 2nd Step Circuit
DTC B1181/18 Open in Driver Side Squib 2nd Step Circuit
DESCRIPTION
The driver side squib 2nd step circuit consists of the center airbag sensor
assembly, the spiral cable and
the steering pad.
The circuit instructs the SRS to deploy when deployment conditions are met.
DTC B1181/18 is recorded when an open circuit is detected in the driver side
squib 2nd step circuit.
DTC No. |
DTC Detecting Condition |
Trouble Area |
B1181/18 |
- Open circuit in D2+ wire harness or D2- wire
harness of driver side squib 2nd step
- Driver side squib 2nd step malfunction
- Spiral cable malfunction
- Center airbag sensor assembly malfunction
|
- Steering pad (Driver side squib 2nd step)
- Spiral cable
- 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 STEERING PAD (DRIVER SIDE SQUIB 2ND STEP)

- 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 steering pad.
- Connect the white wire side of SST (resistance 2.1 Ω) to
the spiral cable.
CAUTION:
Never connect a tester to the steering pad (driver
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 B1181/18 is not output.
HINT:
Codes other than DTC B1181/18 may be output at this
time, but they are not related to this check.
Go to step 2

REPLACE STEERING PAD
2 CHECK DRIVER SIDE SQUIB 2ND STEP CIRCUIT

- 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 spiral
cable.
- Disconnect the connector from the center airbag sensor
assembly.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance

Go to step 4

3 CENTER AIRBAG SENSOR ASSEMBLY

- Connect the connectors to the steering pad 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 B1181/18 is not output.
HINT:
Codes other than DTC B1181/18 may be output at this
time, but they are not related to this check.
REPLACE CENTER AIRBAG SENSOR
ASSEMBLY

USE SIMULATION METHOD TO CHECK
4 CHECK INSTRUMENT PANEL WIRE

- Disconnect the instrument panel wire connector from the
spiral cable.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance

REPAIR OR REPLACE INSTRUMENT
PANEL
WIRE

5 CHECK SPIRAL CABLE

- Measure the resistance according to the value(s) in the
table below.
Standard resistance

REPLACE SPIRAL CABLE

USE SIMULATION METHOD TO CHECK
DTC B1180/17 Short in Driver Side Squib 2nd Step Circuit
DESCRIPTION
The driver side squib 2nd step circuit consists of the center airbag sensor
assembly, the spiral cable and
the steering pad.
...
DTC B1182/19 Short to GND in Driver Side Squib 2nd Step Circuit
DESCRIPTION
The driver side squib 2nd step circuit consists of the center airbag sensor
assembly, the spiral cable and
the steering ...
Other materials:
Disposal
HINT:
When scrapping a vehicle equipped with the SRS or
disposing of the front passenger airbag assembly, be sure to
deploy the airbag first in accordance with the procedure
described below. If any abnormality occurs with airbag
deployment, contact the SERVICE DEPT. of the TOYOTA
MOTOR SALES, ...
On-vehicle inspection
1. INSPECT CENTER AIRBAG SENSOR ASSEMBLY
(VEHICLE NOT INVOLVED IN COLLISION)
Perform a diagnosis system check.
2. INSPECT CENTER AIRBAG SENSOR ASSEMBLY
(VEHICLE INVOLVED IN COLLISION AND AIRBAG
HAS NOT DEPLOYED)
Perform a diagnosis system check.
3. INSPECT CENTER AIRBAG ...
Installation
HINT:
Use the same procedures for the RH side and LH side.
The procedures listed below are for the LH side.
1. INSTALL SIDE AIRBAG SENSOR LH
Check that the ignition switch is off.
Check that the battery negative (-) terminal is
disconnected.
CAUTION:
Afte ...