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### DTC B1800/51 Short in Driver Side Squib Circuit

### DTC B1801/51 Open in Driver Side Squib Circuit

### DTC B1802/51 Short to GND in Driver Side Squib Circuit

### DTC B1803/51 Short to B+ in Driver Side Squib Circuit

## for Preparation Click here

## SYSTEM DESCRIPTION

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

DTC No. | DTC Detection Condition | Trouble Area

B1800/51

Center airbag sensor assembly receives line short circuit signal 5 times in driver squib circuit during primary check

1. Steering pad (driver squib)
2. Spiral cable
3. Center airbag sensor assembly
4. Instrument panel wire

B1801/51

Center airbag sensor assembly receives open circuit signal in driver squib circuit for 2 seconds

1. Steering pad (driver squib)
2. Spiral cable
3. Center airbag sensor assembly
4. Instrument panel wire

B1802/51

Center airbag sensor assembly receives short circuit to ground signal in driver squib circuit for 0.5 seconds

1. Steering pad (driver squib)
2. Spiral cable
3. Center airbag sensor assembly
4. Instrument panel wire

B1803/51

Center airbag sensor assembly receives B+ short circuit signal in driver squib circuit for 0.5 seconds

1. Steering pad (driver squib)
2. Spiral cable
3. Center airbag sensor assembly
4. Instrument panel wire

## WIRING DIAGRAM

## INSPECTION PROCEDURE

1.CHECK FOR DTC

1. Proceed to each step according to DTC readings.

   1. If using the intelligent tester (read the 5 digit DTC):
      Check for DTCs (Click here).

      Result:
      Result | Proceed to
      DTC B1800 is output | A
      DTC B1801 is output | B
      DTC B1802 is output | C
      DTC B1803 is output | D

   2. If not using the intelligent tester (read the 2 digit DTC):
      Check for DTC (Click here).

      Result:
      Result | Proceed to
      DTC 51 is output | E

| B |

Go to step 4

| C |

Go to step 5

| D |

Go to step 6

| E |

Go to step 7

A |

2.CHECK CONNECTOR

1. Turn the ignition switch OFF.

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

1. Check that the spiral cable connector (on the steering pad side) is not damaged.

   OK:
     Lock button is not disengaged, and claw of lock is not deformed or damaged.

| NG |

REPLACE SPIRAL CABLE

OK |

3.CHECK DRIVER SQUIB CIRCUIT (SHORT)

1. Disconnect the connectors from the center airbag sensor and steering pad (Click here).

1. Release the activation prevention mechanism built into connector B.

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

     Tester Connection | Specified Condition
     D+ - D- | 1 MΩ or higher

| NG |

Go to step 13

| OK |

Go to step 10

4.CHECK DRIVER SQUIB CIRCUIT (OPEN)

1. Disconnect the connectors from the center airbag sensor and steering pad.

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

     Tester Connection | Specified Condition
     D+ - D- | Below 1 Ω

| NG |

Go to step 15

| OK |

Go to step 11

5.CHECK DRIVER SQUIB CIRCUIT (TO GROUND)

1. Disconnect the connectors from the center airbag sensor and steering pad.

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

     Tester Connection | Specified Condition
     D+ - Body ground | 1 MΩ or higher
     D- - Body ground | 1 MΩ or higher

| NG |

Go to step 17

| OK |

Go to step 11

6.CHECK DRIVER SQUIB CIRCUIT (TO B+)

1. Disconnect the connectors from the center airbag sensor and steering pad.

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

1. Turn the ignition switch ON.

1. Measure the voltage of the wire harness side connector.

   Standard voltage:

     Tester Connection | Specified Condition
     D+ - Body ground | Below 1 V
     D- - Body ground | Below 1 V

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

   1. Turn the ignition switch OFF.

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

| NG |

Go to step 19

| OK |

Go to step 11

7.CHECK CONNECTOR

1. Check that the spiral cable connector (on the steering pad side) is not damaged.

   OK:
     Lock button is not disengaged, and claw of lock is not deformed or damaged.

| NG |

REPLACE SPIRAL CABLE

OK |

8.CHECK DRIVER SQUIB CIRCUIT

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

1. Turn the ignition switch ON.

1. Measure the voltage of the wire harness side connector.

   Standard voltage:

     Tester Connection | Specified Condition
     D+ - Body ground | Below 1 V
     D- - Body ground | Below 1 V

1. Turn the ignition switch OFF.

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

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

     Tester Connection | Specified Condition
     D+ - D- | Below 1 Ω
     D+ - Body ground | 1 MΩ or higher
     D- - Body ground | 1 MΩ or higher

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

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

     Tester Connection | Specified Condition
     D+ - D- | 1 MΩ or higher

| NG |

Go to step 21

OK |

9.REPLACE SPIRAL CABLE (DRIVER SQUIB)

1. Replace the steering pad (Click here).

1. Connect the connector to the center airbag sensor.

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

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

1. Clear the DTCs (Click here).

1. Turn the ignition switch OFF.

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

1. Check for DTCs (Click here).

   HINT:
     DTCs other than DTC 51 may be output at this time, but they are not related to this check.

| NG |

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK |

END

10.CHECK CENTER AIRBAG SENSOR ASSEMBLY

1. Connect the connector to the center airbag sensor.

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

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

1. Clear the DTCs (Click here).

1. Turn the ignition switch OFF.

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

1. Check for DTCs (Click here).

   OK:
     DTC B1800 is not output.

   HINT:
     DTCs other than DTC B1800 may be output at this time, but they are not related to this check.
   Before proceeding to the next step, perform the following procedures.

   1. Turn the ignition switch OFF.

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

| OK |

Go to step 12

NG |

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

11.CHECK CENTER AIRBAG SENSOR ASSEMBLY

1. Connect the connector to the center airbag sensor.

1. Using a service wire, connect terminals D+ and D- 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.

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

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

1. Clear the DTCs (Click here).

1. Turn the ignition switch OFF.

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

1. Check for DTCs (Click here).

   OK:
     DTC B1801, B1802 or B1803 is not output.

   HINT:
     DTCs other than DTC B1801, B1802 or B1803 may be output at this time, but they are not related to this check.

| NG |

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK |

12.CHECK STEERING PAD (DRIVER SQUIB)

1. Disconnect the service wire from connector E.

1. Connect the connector to the steering pad (driver squib).

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

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

1. Clear the DTCs (Click here).

1. Turn the ignition switch OFF.

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

1. Check for DTCs (Click here).

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

   HINT:
     DTCs other than DTC B1800, B1801, B1802 or B1803 may be output at this time, but they are not related to this check.

| NG |

REPLACE STEERING PAD

OK |

USE SIMULATION METHOD TO CHECK

13.CHECK INSTRUMENT PANEL WIRE (SHORT)

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

   HINT:
     The activation prevention mechanism of connector B has already been released (Click here).

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

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

| NG |

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

OK |

14.CHECK SPIRAL CABLE (SHORT)

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

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

     Tester Connection | Specified Condition
     D+ - D- | 1 MΩ or higher

| NG |

REPLACE SPIRAL CABLE

OK |

USE SIMULATION METHOD TO CHECK

15.CHECK INSTRUMENT PANEL WIRE (OPEN)

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

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

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

| NG |

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

OK |

16.CHECK SPIRAL CABLE (OPEN)

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

     Tester Connection | Specified Condition
     D+ - D- | Below 1 Ω

| NG |

REPLACE SPIRAL CABLE

OK |

USE SIMULATION METHOD TO CHECK

17.CHECK INSTRUMENT PANEL WIRE (TO GROUND)

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

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

     Tester Connection | Specified Condition
     A15-1 (D+) - Body ground | 1 MΩ or higher
     A15-2 (D-) - Body ground | 1 MΩ or higher

| NG |

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

OK |

18.CHECK SPIRAL CABLE (TO GROUND)

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

     Tester Connection | Specified Condition
     D+ - Body ground | 1 MΩ or higher
     D- - Body ground | 1 MΩ or higher

| NG |

REPLACE SPIRAL CABLE

OK |

USE SIMULATION METHOD TO CHECK

19.CHECK INSTRUMENT PANEL WIRE (TO B+)

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

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

1. Turn the ignition switch ON.

1. Measure the voltage of the wire harness side connector.

   Standard voltage:

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

| NG |

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

OK |

20.CHECK SPIRAL CABLE (TO B+)

1. Turn the ignition switch ON.

1. Measure the voltage of the wire harness side connector.

   Standard voltage:

     Tester Connection | Specified Condition
     D+ - Body ground | Below 1 V
     D- - Body ground | Below 1 V

| NG |

REPLACE SPIRAL CABLE

OK |

USE SIMULATION METHOD TO CHECK

21.CHECK INSTRUMENT PANEL WIRE

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

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

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

1. Turn the ignition switch ON.

1. Measure the voltage of the wire harness side connector.

   Standard voltage:

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

1. Turn the ignition switch OFF.

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

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

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

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

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

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

| NG |

REPAIR OR REPLACE INSTRUMENT PANEL WIRE

OK |

22.CHECK SPIRAL CABLE

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

1. Turn the ignition switch ON.

1. Measure the voltage of the wire harness side connector.

   Standard voltage:

     Tester Connection | Specified Condition
     D+ - Body ground | Below 1 V
     D- - Body ground | Below 1 V

1. Turn the ignition switch OFF.

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

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

     Tester Connection | Specified Condition
     D+ - D- | Below 1 Ω
     D+ - Body ground | 1 MΩ or higher
     D- - Body ground | 1 MΩ or higher

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

1. Measure the resistance of the wire harness side connector.

   Standard resistance:

     Tester Connection | Specified Condition
     D+ - D- | 1 MΩ or higher

| NG |

REPLACE SPIRAL CABLE

OK |

USE SIMULATION METHOD TO CHECK