Toyota Venza: Short in Passenger Side Airbag Variable Vent Hole Squib Circuit (B181A/7A-B181D/7A)

Toyota Venza Service Manual / Supplemental Restraint Systems / Airbag System / Short in Passenger Side Airbag Variable Vent Hole Squib Circuit (B181A/7A-B181D/7A)

DESCRIPTION

The passenger side airbag variable vent hole squib circuit consists of the center airbag sensor assembly and front passenger airbag assembly.

The center airbag sensor assembly uses this circuit to deploy the airbag when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the passenger side airbag variable vent hole squib circuit.

DTC No.	DTC Detection Condition	Trouble Area
B181A/7A	The center airbag sensor assembly receives a line short circuit signal in the passenger side airbag variable vent hole squib circuit during primary check. Passenger side airbag variable vent hole squib malfunction Center airbag sensor assembly malfunction	Instrument panel wire Instrument panel wire assembly Front passenger airbag assembly (Passenger side airbag variable vent hole squib) Center airbag sensor assembly
B181B/7A	The center airbag sensor assembly receives an open circuit signal in the passenger side airbag variable vent hole squib circuit. Passenger side airbag variable vent hole squib malfunction Center airbag sensor assembly malfunction	Instrument panel wire Instrument panel wire assembly Front passenger airbag assembly (Passenger side airbag variable vent hole squib) Center airbag sensor assembly
B181C/7A	The center airbag sensor assembly receives a short circuit to ground signal in the passenger side airbag variable vent hole squib circuit. Passenger side airbag variable vent hole squib malfunction Center airbag sensor assembly malfunction	Instrument panel wire Instrument panel wire assembly Front passenger airbag assembly (Passenger side airbag variable vent hole squib) Center airbag sensor assembly
B181D/7A	The center airbag sensor assembly receives a short circuit to B+ signal in the passenger side airbag variable vent hole squib circuit. Passenger side airbag variable vent hole squib malfunction Center airbag sensor assembly malfunction	Instrument panel wire Instrument panel wire assembly Front passenger airbag assembly (Passenger side airbag variable vent hole squib) Center airbag sensor assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Perform the simulation method by selecting check mode (Signal Check) using the Techstream (See page ).
After selecting check mode (Signal Check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city road or rough road (See page
).

PROCEDURE

1.	CHECK CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) Check that the connectors are properly connected to the front passenger airbag assembly and center airbag sensor assembly. Also check that the connectors that link the instrument panel wire and instrument panel wire assembly are properly connected.

OK:

The connectors are properly connected.

HINT:

If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

(d) Disconnect the connectors from the front passenger airbag assembly and center airbag sensor assembly. Also disconnect the instrument panel wire from the instrument panel wire assembly.

(e) Check that the terminals of the connectors are not damaged.

OK:

The terminals are not deformed or damaged.

(f) Check that the instrument panel wire assembly connector (on the front passenger airbag assembly side) is not damaged.

OK:

The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

(g) Check that the short springs for the instrument panel wire and instrument panel wire assembly with the activation prevention mechanism are not deformed or damaged.

OK:

The short springs are not deformed or damaged.

Text in Illustration

*1	Passenger Side Airbag Variable Vent Hole Squib
*2	Center Airbag Sensor Assembly
*3	Instrument Panel Wire Assembly
*4	Instrument Panel Wire

REPLACE WIRE HARNESS

2.	CHECK FRONT PASSENGER AIRBAG ASSEMBLY (PASSENGER SIDE AIRBAG VARIABLE VENT HOLE SQUIB)

(a) Connect the instrument panel wire to the instrument panel wire assembly and center airbag sensor assembly.

(b) Connect SST (resistance 2.1 Ω) to connector E (green connector).

CAUTION:

Never connect the tester to the front passenger airbag assembly (passenger side airbag variable vent hole squib) for measurement, as this may lead to a serious injury due to airbag deployment.

NOTICE:

Do not forcibly insert SST into the terminals of the connector when connecting.
Insert SST straight into the terminals of the connector.

SST: 09843-18061

(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 B181A, B181B, B181C, B181D or 7A is not output.

HINT:

Codes other than DTCs B181A, B181B, B181C, B181D and 7A 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, and wait for at least 90 seconds.

(j) Disconnect SST from connector E.

Text in Illustration

*1	Passenger Side Airbag Variable Vent Hole Squib
*2	Center Airbag Sensor Assembly
*3	Front view of wire harness connector (to Passenger Side Airbag Variable Vent Hole Squib)
*4	Connector E
*5	Color: Green

REPLACE FRONT PASSENGER AIRBAG ASSEMBLY

3.	CHECK PASSENGER SIDE AIRBAG VARIABLE VENT HOLE SQUIB CIRCUIT

(a) Disconnect the instrument panel 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
G3-1 (VHP+) - Body ground	Ignition switch ON	Below 1 V
G3-2 (VHP-) - Body ground	Ignition switch ON	Below 1 V

(1) Turn the ignition switch off.

(2) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G3-1 (VHP+) - G3-2 (VHP-)	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
G3-1 (VHP+) - Body ground	Always	1 MΩ or higher
G3-2 (VHP-) - 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
G3-1 (VHP+) - G3-2 (VHP-)	Always	1 MΩ or higher

(f) Restore the released activation prevention mechanism of connector B to the original condition.

Text in Illustration

*1	Passenger Side Airbag Variable Vent Hole Squib
*2	Center Airbag Sensor Assembly
*3	Front view of wire harness connector (to Passenger Side Airbag Variable Vent Hole Squib)
*4	Connector E
*5	Color: Green

GO TO STEP 5

4.	CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the connectors to the front passenger airbag assembly and center airbag sensor assembly.

(b) Connect the cable to the negative (-) battery terminal.

(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 B181A, B181B, B181C, B181D or 7A is not output.

HINT:

Codes other than DTCs B181A, B181B, B181C, B181D and 7A may be output at this time, but they are not related to this check.

Text in Illustration

*1	Passenger Side Airbag Variable Vent Hole Squib
*2	Center Airbag Sensor Assembly

USE SIMULATION METHOD TO CHECK

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

5.	CHECK INSTRUMENT PANEL WIRE

(a) Disconnect the instrument panel wire assembly from the instrument panel wire.

(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
DG3-1 (VHP+) - Body ground	Ignition switch ON	Below 1 V
DG3-2 (VHP-) - Body ground	Ignition switch ON	Below 1 V

(1) Turn the ignition switch off.

(2) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
DG3-1 (VHP+) - DG3-2 (VHP-)	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
DG3-1 (VHP+) - Body ground	Always	1 MΩ or higher
DG3-2 (VHP-) - 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
DG3-1 (VHP+) - DG3-2 (VHP-)	Always	1 MΩ or higher

(3) Restore the released activation prevention mechanism of connector B to the original condition.

Text in Illustration

*1	Passenger Side Airbag Variable Vent Hole Squib
*2	Center Airbag Sensor Assembly
*3	Instrument Panel Wire Assembly
*4	Instrument Panel Wire
*5	Front view of wire harness connector (to Instrument Panel Wire Assembly)
*6	Connector C

REPLACE INSTRUMENT PANEL WIRE

6.	CHECK INSTRUMENT PANEL WIRE ASSEMBLY

(a) 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
G3-1 (VHP+) - Body ground	Ignition switch ON	Below 1 V
G3-2 (VHP-) - Body ground	Ignition switch ON	Below 1 V

(b) Check for an open in the circuit.

(1) Turn the ignition switch off.

(2) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G3-1 (VHP+) - G3-2 (VHP-)	Always	Below 1 Ω

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G3-1 (VHP+) - Body ground	Always	1 MΩ or higher
G3-2 (VHP-) - Body ground	Always	1 MΩ or higher

(d) Check for a short in the circuit.

(1) Release the activation prevention mechanism built into connector D (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G3-1 (VHP+) - G3-2 (VHP-)	Always	1 MΩ or higher

(3) Restore the released activation prevention mechanism of connector D to the original condition.

Text in Illustration

*1	Passenger Side Airbag Variable Vent Hole Squib
*2	Center Airbag Sensor Assembly
*3	Instrument Panel Wire Assembly
*4	Instrument Panel Wire
*5	Front view of wire harness connector (to Passenger Side Airbag Variable Vent Hole Squib)
*6	Connector E
*7	Color: Green

USE SIMULATION METHOD TO CHECK

REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

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