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

for Preparation Click here

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CAUTION:

In order to prevent unexpected airbag deployment, disconnect the following connectors before inspecting parts such as wire harnesses, if the application of tester probes to the center airbag sensor assembly connector is necessary.

1. (a) Turn the ignition switch to the LOCK position.
   
2. (b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
   
3. (c) Disconnect the connectors from the center airbag sensor assembly.
   
4. (d) Disconnect the connectors from the steering pad.
   
5. (e) Disconnect the connector from the front passenger airbag assembly.
   
6. (f) Disconnect the connector from the front seat airbag assembly LH.
   
7. (g) Disconnect the connector from the front seat airbag assembly RH.
   

   HINT:

   Skip the following steps if side and curtain shield airbags are not fitted.

1. (h) Disconnect the connector from the curtain shield airbag assembly LH.
   
2. (i) Disconnect the connector from the curtain shield airbag assembly RH.
   
3. (j) Disconnect the connector from the front seat outer belt assembly LH.
   
4. (k) Disconnect the connector from the front seat outer belt assembly RH.
   

1. Proceed to the appropriate step according to the DTC readings.
   

   1. If using the Techstream (read the 5-digit DTCs): Using the Techstream, check for DTCs (Click here).
      

      Result:

      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 Techstream (read the 2-digit DTCs): Check for DTCs (Click here).
      

      Result:

      Result	Proceed to
      DTC 54 is output.	E

B	Go to step 7
C	Go to step 11
D	Go to step 15
E	Go to step 21

A

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 assembly connectors (on the front passenger airbag assembly side) are not damaged.
   

   OK:

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

NG	REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

OK

1. Check that the connectors are properly connected to the center airbag sensor assembly and the instrument panel wire assembly.
   

   OK:

   The connectors are properly connected.
   

NG	CONNECT CONNECTORS

OK

1. Disconnect the instrument panel wire assembly connectors from the instrument panel wire and front passenger airbag assembly.
   

2. Release the activation prevention mechanism built into connector D (Click here).
   

3. Measure the resistance.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   A24-1 (P2+) - A24-2 (P2-)	Always	1 MΩ or Higher

NG	REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

OK

1. Disconnect the instrument panel wire connector from the center airbag sensor assembly.
   

2. Release the activation prevention mechanism built into connector B (Click here).
   

3. Measure the resistance.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   IG1-1 (P2+) - IG1-2 (P2-)	Always	1 MΩ or Higher

NG	REPAIR OR REPLACE INSTRUMENT PANEL WIRE

OK

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

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

3. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
   

4. Clear any DTCs stored in the memory (Click here).
   

5. Turn the ignition switch to the LOCK position.
   

6. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
   

7. Check for DTCs (Click here).
   

   OK:

   DTC B1815 is not output.
   

HINT:

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

OK	Go to step 20

NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY

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 assembly connectors (on the front passenger airbag assembly side) are not damaged.
   

   OK:

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

NG	REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

OK

1. Check that the connectors are properly connected to the center airbag sensor assembly and the instrument panel wire assembly.
   

   OK:

   The connectors are properly connected.
   

NG	CONNECT CONNECTORS

OK

1. Disconnect the instrument panel wire assembly connectors from the instrument panel wire and steering pad.
   

2. Measure the resistance.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   A24-1 (P2+) - A24-2 (P2-)	Always	Below 1 Ω

NG	REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

OK

1. Disconnect the instrument panel wire connector assembly from the center airbag sensor assembly.
   

2. Measure the resistance.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   IG1-1 (P2+) - IG1-2 (P2-)	Always	Below 1 Ω

OK	Go to step 19

NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE

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 assembly connectors (on the front passenger airbag assembly side) are not damaged.
   

   OK:

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

NG	REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

OK

1. Check that the connectors are properly connected to the center airbag sensor assembly and the instrument panel wire assembly.
   

   OK:

   The connectors are properly connected.
   

NG	CONNECT CONNECTORS

OK

1. Disconnect the spiral cable connectors from the instrument panel wire and steering pad.
   

2. Measure the resistance.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   A24-1 (P2+) - Body ground	Always	1 MΩ or Higher
   A24-2 (P2-) - Body ground	Always	1 MΩ or Higher

NG	REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

OK

1. Disconnect the instrument panel wire connector from the airbag sensor assembly center.
   

2. Measure the resistance.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   IG1-1 (P2+) - Body ground	Always	1 MΩ or Higher
   IG1-2 (P2-) - Body ground	Always	1 MΩ or Higher

OK	Go to step 19

NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE

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 assembly connectors (on the front passenger airbag assembly side) are not damaged.
   

   OK:

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

NG	REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

OK

1. Check that the connectors are properly connected to the center airbag sensor assembly and the instrument panel wire assembly.
   

   OK:

   The connectors are properly connected.
   

NG	CONNECT CONNECTORS

OK

1. Disconnect the spiral cable connectors from the instrument panel wire and steering pad.
   

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

3. Turn the ignition switch to the ON position.
   

4. Measure the voltage.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   A24-1 (P2+) - Body ground	Ignition switch ON	Below 1 V
   A24-2 (P2-) - Body ground	Ignition switch ON	Below 1 V

NG	REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

OK

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 center airbag sensor 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 resistance.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   IG1-1 (P2+) - Body ground	Always	Below 1 V
   IG1-2 (P2-) - Body ground	Always	Below 1 V

NG	REPAIR OR REPLACE INSTRUMENT PANEL WIRE

OK

HINT:

If continuing from step 14, begin from (a). If continuing from any other step, begin from (c).

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 connectors to the center airbag sensor assembly.
   

4. Using a service wire, connect A24-1 (P2+) and A24-2 (P2-) of connector E.
   

NOTICE:

1. Twist the end of the service wire in order to insert it into the connector.
   
2. Do not forcibly insert the twisted service wire into the terminals of the connector when connecting.
   

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, and wait for at least 60 seconds.
   

7. Clear any DTCs stored in the memory (Click here).
   

8. Turn the ignition switch to the LOCK position.
   

9. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
   

10. Check for DTCs (Click here).
    

    OK:

    DTCs B1816, B1817 and B1818 are not output.
    

HINT:

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

NG	REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK

HINT:

If continuing from step 19, begin from (c) .If continuing from any other step, being from (a).

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 SST from connector C.
   

4. Connect the connectors to the front passenger airbag assembly.
   

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, and wait for at least 60 seconds.
   

7. Clear any DTCs stored in the memory (Click here).
   

8. Turn the ignition switch to the LOCK position.
   

9. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
   

10. Check for DTCs (Click here).
    

    OK:

    DTC B1815, B1816, B1817 and B1818 are not output.
    

HINT:

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

NG	REPLACE FRONT PASSENGER AIRBAG ASSEMBLY

OK
OTHERS USE SIMULATION METHOD TO CHECK

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 assembly connectors (on the front passenger airbag assembly side) are not damaged.
   

   OK:

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

NG	REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

OK

1. Check that the connectors are properly connected to the center airbag sensor assembly and the instrument panel wire assembly.
   

   OK:

   The connectors are properly connected.
   

NG	CONNECT CONNECTORS

OK

1. Disconnect the instrument panel wire assembly connector from the instrument panel wire and front passenger airbag assembly.
   

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

3. Turn the ignition switch to the ON position.
   

4. Measure the voltage.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   A24-1 (P2+) - Body ground	Ignition switch ON	Below 1 V
   A24-2 (P2-) - Body ground	Ignition switch ON	Below 1 V

5. Turn the ignition switch to the LOCK position.
   

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

7. Measure the resistance.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   A24-1 (P2+) - A24-2 (P2-)	Always	Below 1 Ω
   A24-1 (P2+) - Body ground	Always	1 MΩ or Higher
   A24-2 (P2-) - Body ground	Always	1 MΩ or Higher

8. Release the activation prevention mechanism built into connector D (Click here).
   

9. Measure the resistance.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   A24-1 (P2+) - A24-2 (P2-)	Always	1 MΩ or Higher

NG	REPLACE INSTRUMENT PANEL WIRE ASSEMBLY

OK

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

2. Disconnect the instrument panel wire connector from the center airbag sensor 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.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   IG1-1 (P2+) - Body ground	Ignition switch ON	Below 1 V
   IG1-2 (P2-) - Body ground	Ignition switch ON	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.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   IG1-1 (P2+) - IG1-2 (P2-)	Always	Below 1 Ω
   IG1-1 (P2+) - Body ground	Always	1 MΩ or Higher
   IG1-2 (P2-) - Body ground	Always	1 MΩ or Higher

9. Release the activation prevention mechanism built into connector B (Click here).
   

10. Measure the resistance.
    

    Standard resistance:

    Tester Connection	Condition	Specified Condition
    IG1-1 (P2+) - IG1-2 (P2-)	Always	1 MΩ or Higher

NG	REPAIR OR REPLACE INSTRUMENT PANEL WIRE

OK

1. Replace the front passenger airbag (Click here).
   

HINT:

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

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

3. Connect the connectors to the center airbag sensor 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, and wait for at least 60 seconds.
   

6. Clear any DTCs stored in the memory (Click here).
   

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 (Click here).
   

   OK:

   DTC 54 is not output.
   

HINT:

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

NG	REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK
END