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: Wiring Diagram

1. Proceed to each step according to DTC readings.
   1. If using the intelligent tester (read the 5-digit of DTC):

      Using the intelligent tester, check for DTCs (see DTC CHECK / CLEAR  ).

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      DTC B1815 is output.	A
      DTC B1816 is output.	B
      DTC B1817 is output.	C
      DTC B1818 is output.	D

   2. If not using the intelligent tester (read the 2-digit of DTC):

   Check for DTCs (see DTC CHECK / CLEAR  ).

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   DTC 54 is output.	E

B: Go to step   4 

C: Go to step   5 

D: Go to step   6 

E: Go to step   7 

A: Go to next step 

1. Check that the instrument panel wire connectors (on the front passenger airbag side) are not damaged.

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

NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE ASSEMBLY 

OK: Go to next step 

1. Turn the ignition switch to the LOCK position.
   Fig 2: Identifying Front Passenger Side Squib (Dual Stage - 2nd Step)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the connectors from the center airbag sensor.
4. Disconnect the connectors from the front passenger airbag.
5. Release the activation prevention mechanism built into connector "B" (see DIAGNOSIS SYSTEM  ).
6. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   A15-2 (P2+) - A15-1 (P2-)	1 MΩ or higher

OK: Go to step   10 

NG: Go to step   13 

1. Turn the ignition switch to the LOCK position.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the connectors from the center airbag sensor.
4. Disconnect the connectors from the front passenger airbag.
5. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   A15-2 (P2+) - A15-1 (P2-)	Below 1 Ω

   Fig 3: Checking Front Passenger Side Squib (Dual Stage - 2Nd Step) Circuit (Open)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step   11 

NG: Go to step   15 

1. Turn the ignition switch to the LOCK position.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the connectors from the center airbag sensor.
4. Disconnect the connectors from the front passenger airbag.
5. Measure the resistance according to the value(s) in the table below.

Standard resistance 

OK: Go to step   11 

NG: Go to step   17 

Fig 4: Checking Front Passenger Side Squib (Dual Stage - 2Nd Step) Circuit (To Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch to the LOCK position.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the connectors from the center airbag sensor.
4. Disconnect the connectors from the front passenger airbag.
5. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
6. Turn the ignition switch to the ON position.
7. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   A15-2 (P2+) - Body ground	Below 1 V
   A15-1 (P2-) - Body ground	Below 1 V

8. Before proceeding to the next step, perform the following procedures.

1. Turn the ignition switch to the LOCK position.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

Fig 5: Checking Front Passenger Side Squib (Dual Stage - 2Nd Step) Circuit (To B+)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step   11 

NG: Go to step   19 

1. Turn the ignition switch to the LOCK position.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Check that the instrument panel wire connectors (on the front passenger airbag side) are not damaged.

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

NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE ASSEMBLY 

OK: Go to next step 

1. Disconnect the connectors from the center airbag sensor.
2. Disconnect the connectors from the front passenger airbag.
3. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
4. Turn the ignition switch to the ON position.
5. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   A15-2 (P2+) - Body ground	Below 1 V
   A15-1 (P1-) - Body ground	Below 1 V

6. Turn the ignition switch to the LOCK position.
7. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
8. Measure the resistance according to the value(s) in the table below.
   Fig 6: Checking Front Passenger Side Squib (Dual Stage - 2Nd Step) Circuit

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   A15-2 (P2+) - A15-1 (P2-)	Below 1 Ω
   A15-2 (P2+) - Body ground	1 MΩ or higher
   A15-1 (P2-) - Body ground	1 MΩ or higher

9. Release the activation prevention mechanism built into connector "B" (see DIAGNOSIS SYSTEM  ).
10. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    TESTER CONNECTION SPECIFIED CONDITION
    
    

    Tester Connection	Specified Condition
    A15-2 (P2+) - A15-1 (P2-)	1 MΩ or higher

NG: Go to step   21 

OK: Go to next step 

1. Replace the front passenger airbag and connect the connectors.

   HINT:

   Perform the inspection using parts from a normal vehicle if possible.

2. Connect the connectors to the center airbag sensor.
3. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
4. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
5. Clear the DTCs stored in memory (see DTC CHECK / CLEAR  ).
6. Turn the ignition switch to the LOCK position.
7. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
8. Check for DTCs (see DTC CHECK / CLEAR  ).

OK: DTC 54 is not output. 

HINT:

Codes other than code 54 may be output at this time, but they are not related to this check.

NG: REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

Fig 7: Removing Front Passenger Airbag Assembly (Front Passenger Side Squib, Dual Stage - 2Nd Step)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: END 

1. Restore the released activation prevention mechanism of connector "B" to the original condition.
2. Connect the connectors to the center airbag sensor.
3. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
4. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
5. Clear the DTCs stored in memory (see DTC CHECK / CLEAR  ).
6. Turn the ignition switch to the LOCK position.
7. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
8. Check for DTCs (see DTC CHECK / CLEAR  ).

   OK: DTC B1815 is not output. 

   HINT:

   Codes other than code B1815 may be output at this time, but they are not related to this check.

   Fig 8: Checking Center Airbag Sensor Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step   12 

NG: REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

1. Connect the connectors to the center airbag sensor.
2. Using a service wire, connect A15-2 (P2+) and A15-1 (P2-) of connector "C".
   NOTE:

   • Twist the end of the service wire in order to insert it into the connector.
   • Do not forcibly insert the twisted service wire into the terminals of the connector when connecting.
3. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
4. Turn the ignition switch on the ON position, and wait for at least 60 seconds.
5. Clear the DTCs stored in memory (see DTC CHECK / CLEAR  ).
6. Turn the ignition switch to the LOCK position.
7. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
8. Check for DTCs (see DTC CHECK / CLEAR  ).
   Fig 9: Checking Center Airbag Sensor Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: DTC B1816, B1817 or B1818 is not output. 

   HINT:

   Codes other than code B1816, B1817 or B1818 may be output at this time, but they are not related to this check.

9. Before proceeding to the next step, perform the following procedures.
   1. Disconnect the service wire from connector "E".

NG: REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

OK: Go to next step 

1. Turn the ignition switch to the LOCK position.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Connect the connector to the front passenger airbag.
4. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
5. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
6. Clear the DTCs stored in memory (see DTC CHECK / CLEAR  ).
7. Turn the ignition switch to the LOCK position.
8. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
9. Check for DTCs (see DTC CHECK / CLEAR  ).

   OK: DTC B1815, B1816, B1817 or B1818 is not output. 

   HINT:

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

   Fig 10: Checking Front Passenger Airbag Assembly (Front Passenger Side Squib, Dual Stage - 2Nd Step)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE FRONT PASSENGER AIRBAG ASSEMBLY 

OK: PERFORM SYMPTOM SIMULATION 

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

   HINT:

   The activation prevention mechanism of connector "B" has already been released.

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

Standard resistance 

NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE 

Fig 11: Checking Instrument Panel Wire (Short)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Release the activation prevention mechanism built into connector "D" (see DIAGNOSIS SYSTEM  ).
2. Measure the resistance according to the value(s) in the table below.

Standard resistance 

NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE ASSEMBLY 

Fig 12: Checking Instrument Panel Wire Assembly (Short)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: PERFORM SYMPTOM SIMULATION 

1. Disconnect the instrument panel wire connector from the instrument panel wire assembly.
2. Measure the resistance according to the value(s) in the table below.

Standard resistance 

NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE 

Fig 13: Checking Instrument Panel Wire (Open)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

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

Standard resistance 

NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE ASSEMBLY 

Fig 14: Checking Instrument Panel Wire Assembly (Open)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: PERFORM SYMPTOM SIMULATION 

1. Disconnect the instrument panel wire connector from the instrument panel wire assembly.
2. Measure the resistance according to the value(s) in the table below.

Standard resistance 

NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE 

Fig 15: Checking Instrument Panel Wire (To Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

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

Standard resistance 

NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE ASSEMBLY 

Fig 16: Checking Instrument Panel Wire Assembly (To Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: PERFORM SYMPTOM SIMULATION 

1. Turn the ignition switch to the LOCK position.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the instrument panel wire connector from the instrument panel wire assembly.
4. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
5. Turn the ignition switch to the ON position.
6. Measure the voltage according to the value(s) in the table below.

Standard voltage 

NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE 

Fig 17: Checking Instrument Panel Wire (To B+)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below when the ignition switch is in the ON position.

Standard voltage 

NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE ASSEMBLY 

Fig 18: Checking Instrument Panel Wire Assembly (To B+)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: PERFORM SYMPTOM SIMULATION 

1. Restore the released activation prevention mechanism of connector "B" to the original condition.
2. Disconnect the instrument panel wire connector from the instrument panel wire assembly.
3. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
4. Turn the ignition switch to the ON position.
5. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   IG1-3 (P2+) - Body ground	Below 1 V
   IG1-4 (P2-) - Body ground	Below 1 V

6. Turn the ignition switch to the LOCK position.
7. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
8. Measure the resistance according to the value(s) in the table below.
   Fig 19: Checking Instrument Panel Wire

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   IG1-3 (P2+) - IG1-4 (P2-)	Below 1 Ω
   IG1-3 (P2+) - Body ground	1 MΩ or higher
   IG1-4 (P2-) - Body ground	1 MΩ or higher

9. Release the activation prevention mechanism built into connector "B" (see DIAGNOSIS SYSTEM  ).
10. Measure the resistance according to the value(s) in the table below.

Standard resistance 

NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE 

OK: Go to next step 

1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
2. Turn the ignition switch to the ON position.
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   A15-2 (P2+) - Body ground	Below 1 V
   A15-1 (P2-) - Body ground	Below 1 V

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

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   A15-2 (P2+) - A15-1 (P2-)	Below 1 Ω
   A15-2 (P2+) - Body ground	1 MΩ or higher
   A15-1 (P2-) - Body ground	1 MΩ or higher

   Fig 20: Checking Instrument Panel Wire Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Release the activation prevention mechanism built into connector "D" (see DIAGNOSIS SYSTEM  ).
8. Measure the resistance according to the value(s) in the table below.

Standard resistance 

NG: REPAIR OR REPLACE INSTRUMENT PANEL WIRE ASSEMBLY 

OK: PERFORM SYMPTOM SIMULATION