CHECK STEERING PAD (DRIVER SQUIB)
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 |
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 receives line short circuit signal 5 times in driver squib circuit during primary check |
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| B1801/51 | Center airbag sensor receives open circuit signal in driver squib circuit for 2 seconds |
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| B1802/51 | Center airbag sensor receives short circuit to ground signal in driver squib circuit for 0.5 seconds |
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| B1803/51 | Center airbag sensor receives B+ short circuit signal in driver squib circuit for 0.5 seconds |
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WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK STEERING PAD (DRIVER SQUIB) |
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Turn the ignition switch OFF.
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Disconnect the connector from the steering pad (driver squib).
Connect the white wire side of SST (resistance 2.1 Ω) to the spiral cable connector E.
- SST
- 09843-18060
- CAUTION:
- Never connect a tester to the steering pad (driver squib) for measurement, as this may lead to a serious injury due to airbag deployment.
- NOTICE:
- Do not forcibly insert SST into the terminals of the connector when connecting.
- Insert SST straight into the terminals of the connector.
Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
Turn the ignition switch ON, and wait for at least 60 seconds.
Clear the DTCs (Toyota Fortuner RM000000YVY004X.html).
Turn the ignition switch OFF.
Turn the ignition switch ON, and wait for at least 60 seconds.
Check for DTCs (Toyota Fortuner RM000000YVY004X.html).
- OK:
- DTC B1800, B1801, B1802, B1803 or 51 is not output.
- HINT:
- DTCs other than DTC B1800, B1801, B1802, B1803 or 51 may be output at this time, but they are not related to this check.
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| NG | |
| 2.CHECK CONNECTOR |
Turn the ignition switch OFF.
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Disconnect SST (resistance 2.1 Ω) from the spiral cable.
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.
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| OK | |
| 3.CHECK DRIVER SQUIB CIRCUIT |
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Disconnect the connector from the center airbag sensor.
Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
Turn the ignition switch ON.
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
Turn the ignition switch OFF.
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
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
Release the activation prevention mechanism built into connector B (Toyota Fortuner RM000000YVX004X.html).
Measure the resistance of the wire harness side connector.
- Standard resistance:
Tester Connection Specified Condition D+ - D- 1 MΩ or higher
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| NG | |
| 4.CHECK INSTRUMENT PANEL WIRE |
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Restore the released activation prevention mechanism of connector B to its original position.
Disconnect the instrument panel wire connector from the spiral cable.
Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
Turn the ignition switch ON.
Measure the voltage of the wire harness side connector.
- Standard voltage:
Tester Connection Specified Condition A26-1 (D+) - Body ground Below 1 V A26-2 (D-) - Body ground Below 1 V
Turn the ignition switch OFF.
Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
Measure the resistance of the wire harness side connector.
- Standard resistance:
Tester Connection Specified Condition A26-1 (D+) - A26-2 (D-) Below 1 Ω A26-1 (D+) - Body ground 1 MΩ or higher A26-2 (D-) - Body ground 1 MΩ or higher
Release the activation prevention mechanism built into connector B (Toyota Fortuner RM000000YVX004X.html).
Measure the resistance of the wire harness side connector.
- Standard resistance:
Tester Connection Specified Condition A26-1 (D+) - A26-2 (D-) 1 MΩ or higher
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| OK | ||
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