AIRBAG SYSTEM, Diagnostic DTC:B1800/51, B1801/51, B1802/51, B1803/51

DESCRIPTION

• The driver side squib circuit consists of the airbag sensor assembly, spiral cable with sensor sub-assembly and horn button assembly.

• The airbag sensor assembly uses this circuit to deploy the airbag when deployment conditions are met.

• These DTCs are stored when a malfunction is detected in the driver side squib circuit.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK CONNECTORS

   
   
   1. 

      Turn the power switch off.

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

      CAUTION:

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

   3. Check that the connectors are properly connected to the horn button assembly, spiral cable with sensor sub-assembly and airbag sensor assembly.

      OK
      The connectors are properly connected.

      Tip:

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

   4. Disconnect the connectors from the horn button assembly, spiral cable with sensor 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 with sensor sub-assembly connector (on the horn button assembly 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 with sensor sub-assembly with the activation prevention mechanism are not deformed or damaged.

      OK
      The short springs are not deformed or damaged.

      Table 1. Text in Illustration

      *1	Horn Button Assembly
      *2	Spiral Cable with Sensor Sub-assembly
      *3	Airbag Sensor Assembly
      *4	Instrument Panel Wire

   
   
   • OKClick here
   • NGClick here
2. Click here

   CHECK HORN BUTTON ASSEMBLY (DRIVER SIDE SQUIB)

   
   
   1. 

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

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

      CAUTION:

      Never connect the tester to the horn button assembly (driver side squib) 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.

      09843-18061

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

   4. Turn the power switch on (IG), and wait for at least 60 seconds.

   5. Clear the DTCs stored in memory (Click here).

   6. Turn the power switch off.

   7. Turn the power switch on (IG), and wait for at least 60 seconds.

   8. Check for DTCs (Click here).

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

      Table 2. Text in Illustration

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

      Tip:

      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.

   
   
   • OKClick here
   • NGClick here
3. Click here

   CHECK DRIVER SIDE SQUIB CIRCUIT

   
   
   1. 

      Turn the power switch off.

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

      CAUTION:

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

   3. Disconnect SST from connector E.

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

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

      
      

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

      2. Turn the power switch on (IG).

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

         Standard Voltage
         Tester Connection Switch Condition Specified Condition z2-2 (D+) - Body ground Power switch on (IG) Below 1 V z2-1 (D-) - Body ground Power switch on (IG) Below 1 V

   6. Check for an open in the circuit.

      
      

      1. Turn the power switch off.

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

         CAUTION:

         Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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 z2-2 (D+) - z2-1 (D-) Always Below 1 Ω

   7. 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 z2-2 (D+) - Body ground Always 1 MΩ or higher z2-1 (D-) - Body ground Always 1 MΩ or higher

   8. Check for a short in the circuit.

      
      

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

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

         Standard Resistance
         Tester Connection Condition Specified Condition z2-2 (D+) - z2-1 (D-) Always 1 MΩ or higher

         Table 3. Text in Illustration

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

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK AIRBAG SENSOR ASSEMBLY

   
   
   1. 

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

   2. Connect the connectors to the horn button assembly and airbag sensor assembly.

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

   4. Turn the power switch on (IG), and wait for at least 60 seconds.

   5. Clear the DTCs stored in memory (Click here).

   6. Turn the power switch off.

   7. Turn the power switch on (IG), and wait for at least 60 seconds.

   8. Check for DTCs (Click here).

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

      Table 4. Text in Illustration

      *1	Horn Button Assembly
      *2	Spiral Cable with Sensor Sub-assembly
      *3	Airbag Sensor Assembly

      Tip:

      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.

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK INSTRUMENT PANEL WIRE

   
   
   1. 

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

   2. Disconnect the instrument panel wire from the spiral cable with sensor sub-assembly.

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

      
      

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

      2. Turn the power switch on (IG).

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

         Standard Voltage
         Tester Connection Switch Condition Specified Condition H31-1 (D+) - Body ground Power switch on (IG) Below 1 V H31-2 (D-) - Body ground Power switch on (IG) Below 1 V

   4. Check for an open in the circuit.

      
      

      1. Turn the power switch off.

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

         CAUTION:

         Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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 H31-1 (D+) - H31-2 (D-) Always Below 1 Ω

   5. 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 H31-1 (D+) - Body ground Always 1 MΩ or higher H31-2 (D-) - Body ground Always 1 MΩ or higher

   6. Check for a short in the circuit.

      
      

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

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

         Standard Resistance
         Tester Connection Condition Specified Condition H31-1 (D+) - H31-2 (D-) Always 1 MΩ or higher

         Table 5. Text in Illustration

         *1	Horn Button Assembly
         *2	Spiral Cable with Sensor Sub-assembly
         *3	Airbag Sensor Assembly
         *4	Instrument Panel Wire
         *5	Connector C
         *a	Front view of wire harness connector (to Spiral Cable with Sensor Sub-assembly)

   
   
   • OKClick here
   • NGClick here
6. Click here

   CHECK SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

   
   
   1. 

      Check for a short to B+ in the circuit.

      
      

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

      2. Turn the power switch on (IG).

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

         Standard Voltage
         Tester Connection Switch Condition Specified Condition z2-2 (D+) - Body ground Power switch on (IG) Below 1 V z2-1 (D-) - Body ground Power switch on (IG) Below 1 V

   2. Check for an open in the circuit.

      
      

      1. Turn the power switch off.

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

         CAUTION:

         Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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 z2-2 (D+) - z2-1 (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 z2-2 (D+) - Body ground Always 1 MΩ or higher z2-1 (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 (Click here).

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

         Standard Resistance
         Tester Connection Condition Specified Condition z2-2 (D+) - z2-1 (D-) Always 1 MΩ or higher

         Table 6. Text in Illustration

         *1	Horn Button Assembly
         *2	Spiral Cable with Sensor Sub-assembly
         *3	Airbag Sensor Assembly
         *4	Instrument Panel Wire
         *5	Connector E
         *6	Color: Orange
         *a	Front view of wire harness connector (to Horn Button Assembly)

   
   
   • OKClick here
   • NGClick here
7. Click here

   REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLYClick here

8. Click here

   REPLACE HORN BUTTON ASSEMBLYClick here

9. Click here

   REPLACE WIRE HARNESS

10. Click here

    REPLACE AIRBAG SENSOR ASSEMBLYClick here

11. Click here

    USE SIMULATION METHOD TO CHECKClick here

12. Click here

    REPLACE INSTRUMENT PANEL WIRE