DTC B2444, U2017

id080200802700

DTC

B2444

Driver‐side side air bag sensor (internal circuit abnormal)

U2017

Driver‐side side air bag sensor (communication error)
DETECTION CONDITION
Warning
•  Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection according to only the detection conditions may cause injury due to an operating error, or damage the system. When performing an inspection, always follow the inspection procedure.
•  Malfunction in the wiring harness between the driver-side side air bag sensor and SAS unit
•  Malfunction in the driver-side side air bag sensor circuit
POSSIBLE CAUSE
•  Driver-side side air bag sensor connector malfunction
•  Open or short circuit in the wiring harness between the driver-side side air bag sensor and SAS unit
•  Driver-side side air bag sensor malfunction
•  SAS unit malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT DRIVER-SIDE SIDE AIR BAG SENSOR CONNECTOR
Warning
•  Handling the component parts improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the service warnings/cautions and the workshop manual before handling the air bag system components.
•  Turn the ignition switch to the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Disconnect the driver-side side air bag sensor connector. (See SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)
•  Inspect the driver-side side air bag sensor connector. (Corrosion, damage, and disconnected pins)
•  Is there any malfunction of the driver-side side air bag sensor connector?
Yes
Replace the driver-side side air bag sensor wiring harness.
No
Go to the next step.
2
INSPECT WIRING HARNESS BETWEEN SAS UNIT AND DRIVER-SIDE SIDE AIR BAG SENSOR
•  Remove the column cover.
•  Disconnect the clock spring connector.
•  Remove the glove compartment.
•  Disconnect the passenger-side air bag module connector.
•  Disconnect the driver and passenger-side curtain air bag module connectors.
•  Disconnect the passenger-side side air bag module connectors.
•  Remove the rear door lower trim.
•  Disconnect the driver and passenger-side pre-tensioner seat belt connectors.
•  Partially peel back the floor covering.
•  Disconnect the SAS unit connector.
•  Inspect the wiring harnesses between SAS unit connector terminal 2Z and driver-side side air bag connector terminal A, and SAS unit terminal 2AA and driver-side side air bag sensor connector terminal B for the following:
―  Short to body ground
―  Open circuit
―  Short circuit between terminals
Note
•  Inspect for continuity while shaking the wiring harness between the SAS unit and driver-side side air bag sensor.
•  Is the wiring harness normal?
Yes
Go to the next step.
No
Replace the wiring harness between the SAS unit and the driver-side side air bag sensor.
3
INSPECT THE WIRING HARNESS BETWEEN THE SAS UNIT AND DRIVER-SIDE SIDE AIR BAG SENSOR FOR A SHORT CIRCUIT TO THE POWER SUPPLY
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position with SAS unit connector and driver-side side air bag sensor connector disconnected.
•  Measure the voltage of SAS unit connector terminals 2Z and 2AA of SAS unit harness side connector.
Note
•  Measure the voltage while shaking the wiring harness between the SAS unit and driver-side side air bag sensor.
•  Is the voltage measured?
Yes
Replace the wiring harness between the SAS unit and the driver-side side air bag sensor.
No
Replace the driver-side side air bag sensor, then go to the next step.
(See SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)
4
PERFORM DTC INSPECTION
•  Turn the ignition switch to the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Reconnect all disconnected connectors
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position.
•  Clear DTCs using the WDS or eguivalent. (See CLEARING DTC.)
•  Perform the DTC inspection for the SAS unit using the WDS or eguivalent. (See DTC DISPLAY.)
•  Are the same DTCs present?
Yes
Replace the SAS unit.
(See SAS UNIT REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.