DTC B2773, B2774, B2775, B2776

id080200802900

DTC

B2773

Driver-side curtain air bag module circuit resistance low

B2774

Driver-side curtain air bag module circuit 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 1.3-4.7 ohms detected in driver-side curtain air bag module circuit
• Malfunction in wiring harness between driver-side curtain air bag module and SAS control module

POSSIBLE CAUSE

• Open or short circuit in wiring harness between driver-side curtain air bag module and SAS control module
• Driver-side curtain air bag module malfunction
• SAS control module malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE
• Using the WDS or equivalent, verify the following PID/DATA monitor.
- DS_CURT_ST
• Is the resistance of the driver-side curtain air bag module normal?
- Resistance: 1.3-4.7 ohms
Yes
Replace the SAS control module.
No
Go to the next step.
2
INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE 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.
(See SERVICE WARNINGS.)
(See SERVICE CAUTIONS.)
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable and wait for 1 min or more.
• Remove the driver-side C-pillar trim.
• Disconnect the driver-side curtain air bag module connector.
• Is there any malfunction of the driver-side curtain air bag module connector?
Yes
Replace the air bag wiring harness.
No
Go to the next step.
3
VERIFY WHETHER MALFUNCTION IS IN DRIVER-SIDE CURTAIN AIR BAG MODULE OR RELATED WIRING HARNESS
• Connect the leads of the SST (Fuel and thermometer checker) or apply 2-ohm resistance to driver-side curtain air bag module connector terminals A and B.
• Set the resistance of the SST (Fuel and thermometer checker) to the 2-ohm position.
• Connect the negative battery cable.
• Turn the ignition switch to the ON position.
• Are DTCs B2773, B2774, B2775 and/or B2776 indicated?
Yes
Go to the next step.
No
Replace the driver-side curtain air bag module.
4
INSPECT WIRING HARNESS BETWEEN DRIVER-SIDE CURTAIN AIR BAG MODULE AND SAS CONTROL MODULE
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable and wait for 1 min or more.
• Disconnect the driver and passenger-side front seat connectors.
• Disconnect the driver and passenger-side curtain air bag module connectors.
• Turn up floor covering.
• Inspect the wiring harness between SAS control module terminal 2Y and driver-side curtain air bag module terminal A, SAS control module terminal 2V and driver-side curtain air bag module terminal B for the following:
- Short to ground
- Short to power supply
- Open circuit
• Is the wiring harness normal?
Yes
Replace the SAS control module.
No
Replace the air bag wiring harness.