DTC B1046, B2773, B2774, B2775, B2776


id080200808900


System Malfunction Location

DTC

System Malfunction Location

M-MDS display

B1046
Short to the driver-side curtain air bag module circuit and other air bag module circuits
B2773
Driver-side curtain air bag module circuit resistance low
B2774
Driver-side curtain air bag module circuits open circuit or resistance high
B2775
Driver-side curtain air bag module circuit short to body ground
B2776
Driver-side curtain air bag module circuit short to power supply


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.
•  Resistance other than 1.10–9.64 ohms detected in driver-side curtain air bag module circuit
•  Wiring harness between the driver-side curtain air bag module and SAS control module has a malfunction

Possible Causes

•  Driver-side curtain air bag module connector malfunction
•  Open or short circuit or short to ground or short to power supply in the wiring harness between the driver-side curtain air bag module and SAS control module
•  Driver-side curtain air bag module malfunction
•  SAS control module malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action

1
INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE 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.
•  Switch the ignition to off.
•  Remove the C-pillar trim (driver-side). (See C-PILLAR TRIM REMOVAL/INSTALLATION.)
•  Disconnect the driver-side curtain air bag module connector. (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION.)
•  Inspect the driver-side curtain air bag module connector. (Corrosion, damage, and disconnected pins)
•  Is there any malfunction of the driver-side curtain air bag module connector?
Yes
Replace the driver-side curtain air bag module wiring harness.
No
Go to the next step.
2
INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND DRIVER-SIDE CURTAIN AIR BAG MODULE
•  Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION.)
•  Disconnect the clock spring connector.
•  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 connector. (See FRONT SEAT REMOVAL/INSTALLATION.)
•  Remove the C-pillar trim. (See C-PILLAR TRIM REMOVAL/INSTALLATION.)
•  Disconnect the passenger-side curtain air bag module connector (harness side). (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION.)
•  Remove the B-pillar lower trim. (See B-PILLAR LOWER TRIM REMOVAL/INSTALLATION.)
•  Disconnect the lap pre-tensioner seat belt connector. (See FRONT SEAT BELT REMOVAL/INSTALLATION.)
•  Disconnect the driver and passenger-side pre-tensioner seat belt connector. (See FRONT SEAT BELT REMOVAL/INSTALLATION.)
•  Remove the console. (See CONSOLE REMOVAL/INSTALLATION.)
•  Disconnect all SAS control module connectors. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
•  Inspect the wiring harnesses between SAS control module connector terminal 1S and driver-side curtain air bag module connector terminal A, and SAS control module connector terminal 1V and driver-side curtain air bag module 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 curtain air bag module.
•  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 curtain air bag module.
3
INSPECT THE WIRING HARNESS BETWEEN THE SAS CONTROL MODULE AND DRIVER-SIDE CURTAIN AIR BAG MODULE FOR A SHORT CIRCUIT TO THE POWER SUPPLY
•  Switch the ignition to ON with SAS control module connector and driver-side curtain air bag module connector disconnected.
•  Measure the voltage of SAS control module connector terminals 1S and 1V of SAS control module harness side connector.
Note
•  Measure the voltage while shaking the wiring harness between the SAS control module and driver-side curtain air bag module.
•  Is the voltage measured?
Yes
Replace the wiring harness between the SAS control module and the driver-side curtain air bag module.
No
Go to the next step.
4
INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE
•  Switch the ignition to off.
•  Disconnect the negative battery cable and wait for 1min or more.
•  Connect the SST (Fuel and thermometer checker) or apply 2 ohms resistance to the driver-side curtain air bag module connector terminals A–B.
•  Set the SST (Fuel and thermometer checker) to 2 ohms.
•  Except for the driver-side curtain air bag module connector, reconnect all disconnected connectors.
•  Switch the ignition to ON.
•  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
Go to the next step.
No
Replace the driver-side curtain air bag module. (See CURTAIN AIR BAG MODULE REMOVAL/INSTALLATION.)
5
PERFORM SAS CONTROL MODULE DTC INSPECTION
•  Switch the ignition to off.
•  Disconnect the negative battery cable and wait for 1min or more.
•  Disconnect the SST (Fuel and thermometer checker) or the 2 ohms resistance.
•  Connect the driver-side curtain air bag module connector.
•  Switch the ignition to ON.
•  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.
No
DTC troubleshooting completed.