Dtc B1800/51 Short In Driver Side Squib Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STEERING PAD (DRIVER SIDE SQUIB)

CHECK CONNECTOR

CHECK DRIVER SIDE SQUIB CIRCUIT

CHECK DTC

CHECK INSTRUMENT PANEL WIRE

DESCRIPTION

1. The driver side squib circuit consists of the center airbag sensor, spiral cable and steering pad.
   
2. The circuit instructs the SRS to deploy when deployment conditions are met.
   
3. These DTCs are stored when a malfunction is detected in the driver side squib circuit.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. When installing the spiral cable and steering wheel, be sure to adjust the spiral cable as it may break if the steering wheel is turned before adjusting the spiral cable (HILUX_TGN26 RM0000010AZ00SX.html).
   
2. After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (HILUX_TGN26 RM000004QR1003X.html).
   
3. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected (HILUX_TGN26 RM000004QR3003X.html).
   

HINT:

To perform the simulation method, enter check mode (signal check) with the intelligent tester (HILUX_TGN26 RM000000XFF0AKX.html), and then wiggle each connector of the airbag system or drive the vehicle on various types of road (HILUX_TGN26 RM000000XFD0DWX.html).

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 connectors from the steering pad.
   

4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (orange connector).
   

   CAUTION:

   Never connect the tester to the steering pad (driver side squib) for measurement, as this may lead to a serious injury due to airbag deployment.

   NOTICE:

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

SST

09843-18061

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

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

7. Clear the DTCs (HILUX_TGN26 RM000000XFE0E5X.html).
   

8. Turn the ignition switch off.
   

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

10. Check for DTCs (HILUX_TGN26 RM000000XFE0E5X.html).
    

    OK:

    DTC B1800/51, B1801/51, B1802/51 or B1803/51 is not output.
    

    HINT:

    Codes other than DTC B1800/51, B1801/51, B1802/51 and B1803/51 may be output at this time, but they are not related to this check.

    Text in Illustration

    *1	Driver Side Squib
    *2	Spiral Cable
    *3	Center Airbag Sensor
    *4	Connector E
    *5	SST
    *a	Front view of wire harness connector (to Driver Side Squib)
    *b	Color: Orange

1. Turn the ignition switch off.
   

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

3. Disconnect SST from connector E.
   

4. Disconnect the connectors from the center airbag sensor.
   

5. Check that the connectors (on the center airbag sensor side and steering pad side) are not damaged.
   

   OK:

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

   Text in Illustration

   *1	Driver Side Squib
   *2	Spiral Cable
   *3	Center Airbag Sensor

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

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
   2 (D+) - 1 (D-)	Always	Below 1 Ω

7. Release the activation prevention mechanism built into connector B (HILUX_TGN26 RM000000XFD0DWX.html).
   

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

   Standard Resistance:

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

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

1. Connect the connectors to the steering pad and center airbag sensor.
   

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 (HILUX_TGN26 RM000000XFE0E5X.html).
   

5. Turn the ignition switch off.
   

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

7. Check for DTCs (HILUX_TGN26 RM000000XFE0E5X.html).
   

   OK:

   DTC B1800/51, B1801/51, B1802/51 or B1803/51 is not output.
   

   HINT:

   Codes other than DTC B1800/51, B1801/51, B1802/51 and B1803/51 may be output at this time, but they are not related to this check.

   Text in Illustration

   *1	Driver Side Squib
   *2	Spiral Cable
   *3	Center Airbag Sensor

1. Disconnect the instrument panel wire connector from the spiral cable.
   

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

3. Turn the ignition switch to ON.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   G52-1 (D+) - Body ground	Ignition switch ON	Below 1 V
   G52-2 (D-) - Body ground	Ignition switch ON	Below 1 V

5. Turn the ignition switch off.
   

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

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   G52-1 (D+) - G52-2 (D-)	Always	Below 1 Ω

8. Release the activation prevention mechanism built into connector B (HILUX_TGN26 RM000000XFD0DWX.html).
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   G52-1 (D+) - G52-2 (D-)	Always	1 MΩ or higher
   G52-1 (D+) - Body ground	Always	1 MΩ or higher
   G52-2 (D-) - Body ground	Always	1 MΩ or higher

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