DTC B1051, U2017

id080200809300

System Malfunction Location

DTC	System Malfunction Location
M-MDS display
B1051	Driver-side side air bag sensor system internal circuit disabled
U2017	Driver-side side air bag sensor system 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

Possible Causes

System Wiring Diagram

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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. (See AIR BAG SYSTEM SERVICE WARNINGS.) (See AIR BAG SYSTEM SERVICE CAUTIONS.) •  Turn the ignition switch to the LOCK position. •  Remove the battery cover. •  Disconnect the negative battery cable and wait for 1 min or more. (See BATTERY REMOVAL/INSTALLATION [L8, LF].) •  Remove the tire house trim (driver-side). (See TIRE HOUSE TRIM REMOVAL/INSTALLATION.) •  Disconnect the driver-side side air bag sensor connector. •  Inspect the driver-side side air bag sensor connection. (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 CONTROL MODULE AND DRIVER-SIDE SIDE AIR BAG SENSOR •  Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION.) •  Disconnect the clock spring connector. (See CLOCK SPRING 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 seat connectors. (See SEAT REMOVAL/INSTALLATION.) •  Remove the back trim. (See BACK TRIM REMOVAL/INSTALLATION.) •  Remove the driver and passenger-side pre-tensioner seat belt connectors. (See SEAT BELT REMOVAL/INSTALLATION.) •  Remove the console panel. (See CONSOLE PANEL REMOVAL/INSTALLATION.) •  Disconnect the SAS control module connectors. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.) •  Inspect the wiring harnesses between SAS control module connector terminal 2F and driver-side side air bag sensor connector terminal A, and SAS control module connector terminal 2C and driver-side side air bag sensor connector terminal B for the following: ―  Short circuit between terminals ―  Short to body ground ―  Open circuit Note •  Inspect for continuity while shaking the wiring harness between the SAS control module 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 control module and the driver-side side air bag sensor.
3	INSPECT THE WIRING HARNESS BETWEEN THE SAS CONTROL MODULE 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 control module connector and driver-side side air bag sensor disconnected. •  Measure the voltage of SAS control module connector terminals 2F and 2C. Note •  Measure the voltage while shaking the wiring harness between the SAS control module and driver-side side air bag sensor. •  Is the voltage measured?	Yes	Replace the wiring harness between the SAS control module 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 SENSOR REMOVAL/INSTALLATION.)
4	PERFORM SAS CONTROL MODULE DTC INSPECTION •  Turn the ignition switch to the LOCK position. •  Disconnect the negative battery cable and wait for 1min or more. •  Reconnect all disconnected connectors. •  Connect the negative battery cable. •  Turn the ignition switch to the ON position. •  Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC.) •  Perform the DTC inspection for the SAS control module using the M-MDS. (See DTC INSPECTION.) •  Are the same DTCs present?	Yes	Replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
		No	DTC troubleshooting completed.