Dtc B1800/51 Short In Driver Side Squib Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CONNECTORS

CHECK STEERING PAD (DRIVER SIDE SQUIB)

CHECK DRIVER SIDE SQUIB CIRCUIT

CHECK DTC

CHECK INSTRUMENT PANEL WIRE

CHECK SPIRAL CABLE SUB-ASSEMBLY

DESCRIPTION

1. The driver side squib circuit consists of the airbag sensor assembly, spiral cable sub-assembly and steering pad.
   
2. The circuit instructs 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

HINT:

1. Perform the simulation method by selecting check mode (Signal Check) using the Techstream (YARIS_NCP93 RM000000XFF0ATX.html).
   
2. After selecting check mode (Signal Check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city or rough road (YARIS_NCP93 RM00000135202EX.html).
   

1. Turn the ignition switch off.
   

2. Disconnect the cable from the negative (-) battery terminal.
   

   CAUTION:

   Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

3. Check that the connectors are properly connected to the steering pad, spiral cable sub-assembly and airbag sensor assembly.
   

   OK:

   The connectors are properly connected.
   

   HINT:

   If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

4. Disconnect the connectors from the steering pad, spiral cable sub-assembly and airbag sensor assembly.
   

5. Check that the terminals of the connectors are not damaged.
   

   OK:

   The terminals are not deformed or damaged.
   

6. Check that the spiral cable sub-assembly connector (on the steering pad side) is not damaged.
   

   OK:

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

7. Check that the short springs for the instrument panel wire and spiral cable sub-assembly with the activation prevention mechanism are not deformed or damaged.
   

   OK:

   The short springs are not deformed or damaged.
   

   Text in Illustration

   *1	Steering Pad
   *2	Spiral Cable Sub-assembly
   *3	Airbag Sensor Assembly
   *4	Instrument Panel Wire

1. Connect the instrument panel wire to the airbag sensor assembly and spiral cable sub-assembly.
   

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

   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.
      
   2. Insert SST straight into the terminals of the connector.
      

SST

09843-18061

3. Connect the cable to the negative (-) battery terminal.
   

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

5. Clear the DTCs stored in the memory (YARIS_NCP93 RM000000XFE0EFX.html).
   

6. Turn the ignition switch off.
   

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

8. Check for DTCs (YARIS_NCP93 RM000000XFE0EFX.html).
   

   OK:

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

   Text in Illustration

   *1	Steering Pad
   *2	Spiral Cable Sub-assembly
   *3	Airbag Sensor Assembly
   *4	Connector E
   *a	Front view of wire harness connector (to Steering Pad)
   *b	Color: Orange

   HINT:

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

9. Turn the ignition switch off.
   

10. Disconnect the cable from the negative (-) battery terminal.
    

    CAUTION:

    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

11. Disconnect SST from connector E.
    

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

2. Check for a short to B+ in the circuit.
   

   1. Connect the cable to the negative (-) battery terminal.
      

   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
      W10-1 (D+) - Body ground	Ignition switch ON	Below 1 V
      W10-2 (D-) - Body ground	Ignition switch ON	Below 1 V

3. Check for an open in the circuit.
   

   1. Turn the ignition switch off.
      

   2. Disconnect the cable from the negative (-) battery terminal.
      

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      W10-1 (D+) - W10-2 (D-)	Always	Below 1 Ω

4. Check for a short to ground in the circuit.
   

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      W10-1 (D+) - Body ground	Always	1 MΩ or higher
      W10-2 (D-) - Body ground	Always	1 MΩ or higher

5. Check for a short in the circuit.
   

   1. Release the activation prevention mechanism built into connector B (YARIS_NCP93 RM000000XFD0E5X.html).
      

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      W10-1 (D+) - W10-2 (D-)	Always	1 MΩ or higher

      Text in Illustration

      *1	Steering Pad
      *2	Spiral Cable Sub-assembly
      *3	Airbag Sensor Assembly
      *4	Connector E
      *a	Front view of wire harness connector (to Steering Pad)
      *b	Color: Orange

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

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

2. Connect the cable to the negative (-) battery terminal.
   

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

4. Clear the DTCs stored in the memory (YARIS_NCP93 RM000000XFE0EFX.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 (YARIS_NCP93 RM000000XFE0EFX.html).
   

   OK:

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

   Text in Illustration

   *1	Steering Pad
   *2	Spiral Cable Sub-assembly
   *3	Airbag Sensor Assembly

   HINT:

   Codes other than DTCsB1800/51, B1801/51, B1802/51 and B1803/51 may be output at this time, but they are not related to this check.

1. Disconnect the instrument panel wire from the spiral cable sub-assembly.
   

2. Check for a short to B+ in the circuit.
   

   1. Connect the cable to the negative (-) battery terminal.
      

   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
      D113-1 (D+) - Body ground	Ignition switch ON	Below 1 V
      D113-2 (D-) - Body ground	Ignition switch ON	Below 1 V

3. Check for an open in the circuit.
   

   1. Turn the ignition switch off.
      

   2. Disconnect the cable from the negative (-) battery terminal.
      

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      D113-1 (D+) - D113-2 (D-)	Always	Below 1 Ω

4. Check for a short to ground in the circuit.
   

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      D113-1 (D+) - Body ground	Always	1 MΩ or higher
      D113-2 (D-) - Body ground	Always	1 MΩ or higher

5. Check for a short in the circuit.
   

   1. Release the activation prevention mechanism built into connector B (YARIS_NCP93 RM000000XFD0E5X.html).
      

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      D113-1 (D+) - D113-2 (D-)	Always	1 MΩ or higher

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

1. Check for a short to B+ in the circuit.
   

   1. Connect the cable to the negative (-) battery terminal.
      

   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
      W10-1 (D+) - Body ground	Ignition switch ON	Below 1 V
      W10-2 (D-) - Body ground	Ignition switch ON	Below 1 V

2. Check for an open in the circuit.
   

   1. Turn the ignition switch off.
      

   2. Disconnect the cable from the negative (-) battery terminal.
      

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      W10-1 (D+) - W10-2 (D-)	Always	Below 1 Ω

3. Check for a short to ground in the circuit.
   

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      W10-1 (D+) - Body ground	Always	1 MΩ or higher
      W10-2 (D-) - Body ground	Always	1 MΩ or higher

4. Check for a short in the circuit.
   

   1. Release the activation prevention mechanism built into connector D (YARIS_NCP93 RM000000XFD0E5X.html).
      

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

      Standard Resistance:

      Tester Connection	Condition	Specified Condition
      W10-1 (D+) - W10-2 (D-)	Always	1 MΩ or higher

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