DTC B2777, B2778, B2779, B2780

id0802a0803000

DTC

B2777

Passenger-side curtain air bag module circuit resistance low

B2778

Passenger-side curtain air bag module circuit resistance high

B2779

Passenger side curtain air bag module circuit short to body ground

B2780

Passenger-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 1.9-2.7 ohms detected in passenger-side curtain air bag module circuit
• Wiring harness between the passenger-side curtain air bag module and SAS control module has a malfunction.

POSSIBLE CAUSE

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

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT PASSENGER-SIDE CURTAIN AIR BAG MODULE
• Using the WDS or equivalent, verify the following PID/DATA monitor.
- OD_P_CURT
• Is the resistance of the passenger-side curtain air bag module normal?
- Resistance: 1.9-2.7 ohms
Yes
Replace the SAS control module.
No
Go to the next step.
2
INSPECT PASSENGER-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 headliner.
• Disconnect the passenger-side curtain air bag module connector.
• Is there any malfunction of the passenger-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 PASSENGER-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 passenger-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 B2777, B2778, B2779 and/or B2780 indicated?
Yes
Replace the air bag wiring harness, then go to the next step.
No
Replace the passenger-side curtain air bag module.
4
INSPECT WIRING HARNESS BETWEEN PASSENGER-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 side air bag connectors.
• Disconnect the driver and passenger-side curtain air bag module connectors.
• Remove the console.
• Inspect the wiring harness between SAS control module terminal 1D and passenger-side curtain air bag module terminal A, SAS control module terminal 1H and passenger-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.