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 [05/2013 - ]: Procedure

1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Check that the connector is properly connected to the front passenger airbag assembly.

   OK

   The connector is properly connected.

   HINT: 

   If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

4. Disconnect the connector from the front passenger airbag assembly.
5. Check that the No. 2 instrument panel wire connector (on the front passenger airbag assembly side) is not damaged.

   OK

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

NG → REPLACE NO. 2 INSTRUMENT PANEL WIRE 

OK: Go to next step 

• SST: 09843-18061 

1. Disconnect the connector from the front passenger airbag assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Connect SST (resistance 2.1 Ω) to connector E (black connector).
   WARNING:

   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.

   NOTE:

   • Do not forcibly insert SST into the terminals of the connector when connecting.
   • Insert SST straight into the terminals of the connector.
3. Connect the cable to the negative battery terminal, and wait for at least 2 seconds.
4. Turn the ignition switch to ON, and wait for at least 60 seconds.
5. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR [05/2013 - ] .
6. Turn the ignition switch off.
7. Turn the ignition switch to ON, and wait for at least 60 seconds.
8. Check the DTCs. Refer to DTC CHECK / CLEAR [05/2013 - ] .

   OK

   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	Connector E
   *a	Front view of wire harness connector (to Front Passenger Side Squib 2nd Step)
   *b	Color: Black
   *c	Front view of DLC3
   *d	DTC 54

   HINT: 

   DTCs other than 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   8 

1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect the SST from connector E.
4. Check that the connector is properly connected to the center airbag sensor assembly.

   OK

   The connector is properly connected.

   HINT: 

   If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

5. Disconnect the connector from the center airbag sensor assembly.
6. Check that the terminal of the connector is not damaged.

   OK

   The terminal is not deformed or damaged.

7. Check that the short spring for the instrument panel wire connector with the activation prevention mechanism is not deformed or damaged.

   OK

   The short spring is not deformed or damaged.

NG → REPLACE INSTRUMENT PANEL WIRE 

OK: Go to next step 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the cable to the negative battery terminal, and wait for at least 2 seconds.
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
   DN3-3 (P2+) - Body ground	Ignition switch ON	Below 1 V
   DN3-4 (P2-) - Body ground	Ignition switch ON	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front Passenger Side Squib 2nd Step
   *2	No. 2 Instrument Panel Wire
   *3	Instrument Panel Wire
   *4	Center Airbag Sensor Assembly
   *5	Connector C
   *a	Rear view of wire harness connector (to No. 2 Instrument Panel Wire)

4. Turn the ignition switch off.
5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
6. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   DN3-3 (P2+) - DN3-4 (P2-)	Always	Below 1 Ω

7. Release the activation prevention mechanism built into connector B. Refer to DIAGNOSIS SYSTEM [05/2013 - ] .
8. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   DN3-3 (P2+) - DN3-4 (P2-)	Always	1 MΩ or higher
   DN3-3 (P2+) - Body ground	Always	1 MΩ or higher
   DN3-4 (P2-) - Body ground	Always	1 MΩ or higher

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

NG → REPLACE INSTRUMENT PANEL WIRE 

OK: Go to next step 

1. Check that the connectors that link the instrument panel wire and No. 2 instrument panel wire harness 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.

2. Disconnect the connectors that link the instrument panel wire and No. 2 instrument panel wire.
3. Check that the terminals of the connectors are not damaged.

   OK

   The terminals are not deformed or damaged.

4. Check that the short spring for the No. 2 instrument panel wire assembly connector with the activation prevention mechanism is not deformed or damaged.

   OK

   The short spring is not deformed or damaged.

NG → REPLACE NO. 2 INSTRUMENT PANEL WIRE OR INSTRUMENT PANEL WIRE 

OK: Go to next step 

1. Connect the cable to the negative battery terminal, and wait for at least 2 seconds.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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
   N3-1 (P2-) - Body ground	Ignition switch ON	Below 1 V
   N3-2 (P2+) - Body ground	Ignition switch ON	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front Passenger Side Squib 2nd Step
   *2	No. 2 Instrument Panel Wire
   *3	Instrument Panel Wire
   *4	Center Airbag Sensor Assembly
   *5	Connector E
   *a	Front view of wire harness connector (to Front Passenger Side Squib 2nd Step)
   *b	Color: Black

4. Turn the ignition switch off.
5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
6. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N3-2 (P2+) - N3-1 (P2-)	Always	Below 1 Ω

7. Release the activation prevention mechanism built into connector D. Refer to DIAGNOSIS SYSTEM [05/2013 - ] .
8. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N3-2 (P2+) - N3-1 (P2-)	Always	1 MΩ or higher
   N3-2 (P2+) - Body ground	Always	1 MΩ or higher
   N3-1 (P2-) - Body ground	Always	1 MΩ or higher

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

NG → REPLACE NO. 2 INSTRUMENT PANEL WIRE 

OK: Go to next step 

1. Connect the connectors to the front passenger airbag assembly, the No. 2 instrument panel wire, the instrument panel wire and the center airbag sensor assembly.
2. Connect the cable to the negative battery terminal, and wait for at least 2 seconds.
3. Turn the ignition switch to ON, and wait for at least 60 seconds.
4. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR [05/2013 - ] .
5. Turn the ignition switch off.
6. Turn the ignition switch to ON, and wait for at least 60 seconds.
7. Check the DTCs. Refer to DTC CHECK / CLEAR [05/2013 - ] .

   OK

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

   HINT: 

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

NG → See step   9 

OK → See step   10