DTC B2773, B2774, B2775, B2776

id080200802900

DTC

B2773

Driver-side curtain air bag module system resistance low

B2774

Driver-side curtain air bag module system resistance high

B2775

Driver-side curtain air bag module system circuit short to ground

B2776

Driver-side curtain air bag module system circuit short to power supply

DETECTION CONDITION

Warning
• Detection conditions are for understanding DTC outline before performing inspection. Performing inspection with only detection conditions may cause injury due to operating error or damage the system. When performing inspection, always follow inspection procedure.
• Abnormal resistance (other than 1.4-3.2 ohm) detected in driver-side curtain air bag module circuit
• Malfunction in wiring harness between driver-side curtain air bag module and SAS unit

POSSIBLE CAUSE

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

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE
• Check following PID/DATA monitor, using SST (WDS or equivalent).
- DR_CURTN
• Is resistant value of driver-side curtain air bag module normal?
- Resistance: 1.4-3.2 ohm
Yes
Present malfunction diagnosis:
• Replace SAS unit.
Past malfunction diagnosis:
• Troubleshooting completed.
No
Go to next step.
2
INSPECT DRIVER-SIDE CURTAIN AIR BAG MODULE CONNECTOR
Warning
• Handling air bag system components improperly can accidentally deploy air bag modules and pre-tensioner seat belts, which may seriously injure you. Read AIR BAG SYSTEM SERVICE WARNINGS before handling air bag system components.
(See SERVICE WARNINGS)
• Turn ignition switch to LOCK position.
• Disconnect negative battery cable and wait for more than 1 minute.
• Disconnect driver-side curtain air bag module connector.
• Is there cracking or chipping in driver-side curtain air bag module connector?
Yes
Replace wiring harness.
No
Go to next step.
3
VERIFY WHETHER MALFUNCTION IS IN DRIVER-SIDE CURTAIN AIR BAG MODULE OR RELATED WIRING HARNESS
• Connect leads of SST (Fuel and thermometer checker) or apply 2 ohm resistor to driver-side curtain air bag module connector terminal A and B.
• Set resistance of SST (Fuel and thermometer checker) to 2 ohm.
• Connect negative battery cable.
• Turn ignition switch to ON position.
• Check following PID/DATA monitor, using SST (WDS or equivalent).
- DO_D_CURT
• Is related wiring harness normal?
Yes
Replace driver-side curtain air bag module.
No
Replace wiring harness, then go to next step.
4
INSPECT SAS UNIT
• Turn ignition switch to LOCK position.
• Disconnect negative battery cable and wait for more than 1 minute.
• Connect driver-side curtain air bag module connector.
• Are DTCs B2773, B2774, B2775 and/or B2776 indicated?
Yes
Present malfunction diagnosis:
• Replace SAS unit.
Past malfunction diagnosis:
• Troubleshooting completed.
No
Troubleshooting completed.