Mazda 2002 6 - Page 1110

T–202
ON-BOARD DIAGNOSTIC [AIR BAG SYSTEM]
DTC B1877, B1878, B1879, B1885
A6E817401046W09
Diagnostic procedure
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
STEP INSPECTION ACTION
1 INSPECT DRIVER-SIDE PRE-TENSIONER
SEAT BELT
• Check following PID/DATA monitor, using
SST (WDS or equivalent).
(See T–195 PID/DATA MONITOR TABLE)
— 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.
(See T–124 SAS UNIT REMOVAL/INSTALLATION)
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 T–117 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.