DTC B104B, B104E, B1051, U2017

id080200810800

DTC

B104B

Driver-side side air bag sensor No.1 and other sensor circuits short to power supply

B104E

Driver-side side air bag sensor No.1 circuit open or short

B1051

Driver-side side air bag sensor No.1 (internal circuit abnormal)

U2017

Driver-side side air bag sensor No.1 (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 wiring harness between driver-side side air bag sensor No.1 and SAS control module
•  Malfunction in driver-side side air bag sensor No.1 circuit
POSSIBLE CAUSE
•  Open or short circuit in wiring harness between driver-side side air bag sensor No.1 and SAS control module
•  Driver-side side air bag sensor No.1 malfunction
•  SAS control module malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT DRIVER-SIDE SIDE AIR BAG SENSOR NO.1 CONNECTOR
Warning
•  Handling the air bag system components improperly can accidentally deploy the air bag modules and pre-tensioner seat belts, which may seriously injure you. Read the service warnings and cautions before handling the air bag system components.
•  Turn the ignition switch to the OFF position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Disconnect the driver-side side air bag sensor No.1 connector.
•  Is there any malfunction of the driver-side side air bag sensor No.1 connector?
Yes
Replace the air bag wiring harness.
No
Go to the next step.
2
INSPECT WIRING HARNESS BETWEEN DRIVER-SIDE SIDE AIR BAG SENSOR NO.1 AND SAS CONTROL MODULE
•  Turn the ignition switch to the OFF position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION.)
•  Disconnect the clock spring connector. (See COMBINATION SWITCH REMOVAL/INSTALLATION.)
•  Remove the glove compartment. (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.)
•  Disconnect the passenger-side air bag module connector. (See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)
•  Disconnect the driver and passenger-side front seat connectors. (See FRONT SEAT REMOVAL/INSTALLATION.)
•  Disconnect the driver and passenger-side curtain air bag module connectors. (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION.)
•  Remove the B-pillar lower trim. (See B-PILLAR LOWER TRIM REMOVAL/INSTALLATION.)
•  Disconnect the driver and passenger-side pre-tensioner seat belt connectors. (See FRONT SEAT BELT REMOVAL/INSTALLATION.)
•  Disconnect the SAS control module connectors. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
•  Disconnect the driver-side side air bag sensor No.1 connector.
•  Inspect the wiring harnesses between SAS control module terminal 2O and driver-side side air bag sensor No.1 terminal A, SAS control module terminal 2S and driver-side side air bag sensor No.1 terminal B for the following:
―  Short to ground
―  Short to power supply
―  Open circuit
Note
•  Inspect for continuity while shaking the wiring harness between the driver-side side air bag sensor No.1 and SAS control module.
•  Is the wiring harness normal?
Yes
Replace the driver-side side air bag sensor No.1, then go to the next step.
(See SIDE AIR BAG SENSOR NO. 1 REMOVAL/INSTALLATION.)
No
Replace the air bag wiring harness.
3
INSPECT SAS CONTROL MODULE
•  Connect the SAS control module connector.
•  Connect the driver and passenger-side pre-tensioner seat belt connectors.
•  Connect the driver-side side air bag sensor No.1 connector.
•  Connect the driver and passenger-side curtain air bag module connectors.
•  Connect the driver and passenger-side front seat connectors.
•  Connect the passenger-side air bag module connector.
•  Connect the clock spring connector.
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position.
•  Are DTCs B104B, B104E, B1051 and/or U2017 indicated?
Yes
Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.