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 except 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
Warning
• Handling the air bag system components improperly can accidentally operate (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 C pillar trim on the left side.
Disconnect the passenger-side curtain air bag module connector.
Is there any malfunction in the passenger-side curtain air bag module connector?
Yes
Replace the air bag wiring harness.
No
Go to the next step.
2
• 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.
• Verify the following PIDs using the WDS or equivalent.
- OD_P_CURT
Are related wiring harnesses normal?
Yes
Replace the passenger-side curtain air bag module.
No
Replace the air bag wiring harness, then go to the next step.
3
Turn the ignition switch to the LOCK position.
Disconnect the negative battery cable and wait for 1 min or more.
Connect the passenger-side curtain air bag module connector.
Are DTCs B2777, B2778, B2779 and/or B2780 indicated?
Yes
[Present malfunction diagnosis]
Replace the SAS control module.
[Past malfunction diagnosis]
DTC inspection completed.
No
DTC inspection completed.