DTC B1877, B1878, B1879, B1885

id080200801400

DTC

B1877

Driver-side pre-tensioner seat belt system resistance high

B1878

Driver-side pre-tensioner seat belt system circuit short to power supply

B1879

Driver-side pre-tensioner seat belt system circuit short to ground

B1885

Driver-side pre-tensioner seat belt system resistance low

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 1.5-3.1 ohm) detected in driver-side pre-tensioner seat belt circuit
• Malfunction in wiring harness between driver-side pre-tensioner seat belt and SAS unit

POSSIBLE CAUSE

• Open or short circuit in wiring harness between driver-side pre-tensioner seat belt and SAS unit
• Driver-side pre-tensioner seat belt malfunction
• SAS unit malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT DRIVER-SIDE PRE-TENSIONER SEAT BELT
• Check following PID/DATA monitor, using SST (WDS or equivalent).
- DR_PTENS
• Is resistant value of driver-side pre-tensioner seat belt normal?
- Resistance: 1.5-3.1 ohm
Yes
Present malfunction diagnosis:
• Replace SAS unit.
Past malfunction diagnosis:
• Troubleshooting completed.
No
Go to next step.
2
INSPECT DRIVER-SIDE PRE-TENSIONER SEAT BELT 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.
• Remove driver's side B-pillar lower trim.
• Disconnect driver-side pre-tensioner seat belt connector.
• Is there cracking or chipping in driver-side pre-tensioner seat belt connector?
Yes
Replace wiring harness.
No
Go to next step.
3
VERIFY WHETHER MALFUNCTION IS IN DRIVER-SIDE PRE-TENSIONER SEAT BELT OR RELATED WIRING HARNESS
• Connect leads of SST (Fuel and thermometer checker) or apply 2 ohm resistor to driver-side pre-tensioner seat belt 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).
- DSB_P_ST
• Is related wiring harness normal?
Yes
Replace driver-side pre-tensioner seat belt.
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 pre-tensioner seat belt connector.
• Are DTCs B1877, B1878, B1879 and/or B1885 indicated?
Yes
Present malfunction diagnosis:
• Replace SAS unit.
Past malfunction diagnosis:
• Troubleshooting completed.
No
Troubleshooting completed.