DTC B1815/54: Short in Front Passenger Side Squib 2nd Step Circuit; DTC B1816/54: Open in Front Passenger Side Squib 2nd Step Circuit; DTC B1817/54: Short to GND in Front Passenger Side Squib 2nd Step Circuit; DTC B1818/54: Short to B+ in Front Passenger Side Squib 2nd Step Circuit (07/2012 - ): Procedure

CHECK CONNECTORS

Turn the engine switch off.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the cable from the negative (-) battery terminal.
NOTE:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
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.
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.
Check that the terminals of the connectors are not damaged.
OK

The terminals are not deformed or damaged.
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.

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.

The short springs are not deformed or damaged.

TEXT IN ILLUSTRATION

*1	Front Passenger Side Squib 2nd Step
*2	Center Airbag Sensor Assembly
*3	Instrument Panel Wire Assembly
*4	Instrument Panel Wire

NG → REPLACE WIRE HARNESS

OK: Go to next step

CHECK FRONT PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB 2ND STEP)

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Connect SST (resistance 2.1 Ω) to connector E (black connector).
WARNING:
Never connect the 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.
NOTE:
- 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
Connect the cable to the negative (-) battery terminal.
Turn the engine switch on (IG), and wait for at least 60 seconds.
Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR [03/2012 - ] .
Turn the engine switch off.
Turn the engine switch on (IG), and wait for at least 60 seconds.

Check for DTCs. Refer to DTC CHECK / CLEAR [03/2012 - ] .

DTC B1815, B1816, B1817, B1818 or 54 is not output.

TEXT IN ILLUSTRATION

*1	Front Passenger Side Squib 2nd Step
*2	Center Airbag Sensor Assembly
*3	Front view of wire harness connector (to Front Passenger Airbag Assembly)
*4	Connector E
*5	Color: Black

HINT:

Codes other than DTC B1815, B1816, B1817, B1818 and 54 may be output at this time, but they are not related to this check.

NG → See step 3

OK → See step 9

CHECK FRONT PASSENGER SIDE SQUIB 2ND STEP CIRCUIT

Turn the engine switch off.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the cable from the negative (-) battery terminal.
NOTE:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Disconnect SST from connector E.
Disconnect the instrument panel wire from the center airbag sensor assembly.

Check for a short to B+ in the circuit.

Connect the cable to the negative (-) battery terminal.
Turn the engine switch on (IG).

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
c1-1 (P2-) - Body ground	Engine switch on (IG)	Below 1 V
c1-2 (P2+) - Body ground	Engine switch on (IG)	Below 1 V

Check for an open in the circuit.

Turn the engine switch off.
Disconnect the cable from the negative (-) battery terminal.
NOTE:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
c1-1 (P2-) - c1-2 (P2+)	Always	Below 1 Ω

Check for a short to ground in the circuit.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
c1-1 (P2-) - Body ground	Always	1 MΩ or higher
c1-2 (P2+) - Body ground	Always	1 MΩ or higher

Check for a short in the circuit.

Release the activation prevention mechanism built into connector B. Refer to DIAGNOSIS SYSTEM [03/2012 - ] .

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

Standard Resistance

Tester Connection	Condition	Specified Condition
c1-1 (P2-) - c1-2 (P2+)	Always	1 MΩ or higher

TEXT IN ILLUSTRATION

*1	Front Passenger Side Squib 2nd Step
*2	Center Airbag Sensor Assembly
*3	Front view of wire harness connector (to Front Passenger Airbag Assembly)
*4	Connector E
*5	Color: Black

NG → See step 5

OK: Go to next step

CHECK CENTER AIRBAG SENSOR ASSEMBLY

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Connect the connectors to the front passenger airbag assembly and center airbag sensor assembly.
Connect the cable to the negative (-) battery terminal.
Turn the engine switch on (IG), and wait for at least 60 seconds.
Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR [03/2012 - ] .
Turn the engine switch off.
Turn the engine switch on (IG), and wait for at least 60 seconds.

Check for DTCs. Refer to DTC CHECK / CLEAR [03/2012 - ] .

DTC B1815, B1816, B1817, B1818 or 54 is not output.

TEXT IN ILLUSTRATION

*1	Front Passenger Side Squib 2nd Step
*2	Center Airbag Sensor Assembly

HINT:

Codes other than DTC B1815, B1816, B1817, B1818 and 54 may be output at this time, but they are not related to this check.

NG → See step 7

OK → See step 8

CHECK INSTRUMENT PANEL WIRE

Restore the release activation prevention mechanism of connector B to the original condition.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the instrument panel wire assembly from the instrument panel wire.

Check for a short to B+ in the circuit.

Connect the cable to the negative (-) battery terminal.
Turn the engine switch on (IG).

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
Fc1-3 (P2+) - Body ground	Engine switch on (IG)	Below 1 V
Fc1-4 (P2-) - Body ground	Engine switch on (IG)	Below 1 V

Check for an open in the circuit.

Turn the engine switch off.
Disconnect the cable from the negative (-) battery terminal.
NOTE:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
Fc1-3 (P2+) - Fc1-4 (P2-)	Always	Below 1 Ω

Check for a short to ground in the circuit.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
Fc1-3 (P2+) - Body ground	Always	1 MΩ or higher
Fc1-4 (P2-) - Body ground	Always	1 MΩ or higher

Check for a short in the circuit.

Release the activation prevention mechanism built into connector B. Refer to DIAGNOSIS SYSTEM [03/2012 - ] .

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

Standard Resistance

Tester Connection	Condition	Specified Condition
Fc1-3 (P2+) - Fc1-4 (P2-)	Always	1 MΩ or higher

TEXT IN ILLUSTRATION

*1	Front Passenger Side Squib 2nd Step
*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

NG → REPLACE INSTRUMENT PANEL WIRE

OK: Go to next step

CHECK INSTRUMENT PANEL WIRE ASSEMBLY

Check for a short to B+ in the circuit.

Connect the cable to the negative (-) battery terminal.
Turn the engine switch on (IG).

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
c1-1 (P2-) - Body ground	Engine switch on (IG)	Below 1 V
c1-2 (P2+) - Body ground	Engine switch on (IG)	Below 1 V

Check for an open in the circuit.

Turn the engine switch off.
Disconnect the cable from the negative (-) battery terminal.
NOTE:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
c1-1 (P2-) - c1-2 (P2+)	Always	Below 1 Ω

Check for a short to ground in the circuit.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
c1-1 (P2-) - Body ground	Always	1 MΩ or higher
c1-2 (P2+) - Body ground	Always	1 MΩ or higher

Check for a short in the circuit.

Release the activation prevention mechanism built into connector D. Refer to DIAGNOSIS SYSTEM [03/2012 - ] .

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

Standard Resistance

Tester Connection	Condition	Specified Condition
c1-1 (P2-) - c1-2 (P2+)	Always	1 MΩ or higher

TEXT IN ILLUSTRATION

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

NG → REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

OK → See step 8

REPLACE CENTER AIRBAG SENSOR ASSEMBLY. Refer to REMOVAL [07/2012 - ]
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [07/2012 - ]
REPLACE FRONT PASSENGER AIRBAG ASSEMBLY. Refer to REMOVAL [07/2012 - ]