Mazda 6 2002 Workshop Manual page 1054

DTC B1877, B1878, B1879, B1885
B1877 Driver-side pre-tensioner seat belt system resistance high
B1878 Driver-side pre-tensioner seat belt system circuit short to power supply
DTC
B1879 Driver-side pre-tensioner seat belt system circuit short to ground
B1885 Driver-side pre-tensioner seat belt system resistance low
Warning
• • • • Detection conditions are for understanding DTC outline before performing inspection.
DETECTION
CONDITION
• 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
• Open or short circuit in wiring harness between driver-side pre-tensioner seat belt and SAS unit
POSSIBLE
• Driver-side pre-tensioner seat belt malfunction
CAUSE
• SAS unit malfunction
Diagnostic procedure
STEP
1 INSPECT DRIVER-SIDE PRE-TENSIONER
SEAT BELT
• Check following PID/DATA monitor, using
SST (WDS or equivalent).
(See T–195 PID/DATA MONITOR
— DR_PTENS
• Is resistant value of driver-side pre-tensioner
seat belt normal?
— Resistance: 1.5—3.1 ohm
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
• 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?
T–202
ON-BOARD DIAGNOSTIC [AIR BAG SYSTEM]
Performing inspection with only detection conditions may cause injury due to operating error
or damage the system. When performing inspection, always follow inspection procedure.
INSPECTION
TABLE)
WARNINGS)
Yes Present malfunction diagnosis:
• Replace SAS unit.
(See T–124 SAS UNIT
Past malfunction diagnosis:
• Troubleshooting completed.
No Go to net step.
Yes Replace wiring harness.
No Go to net step.
A6E817401046W09
ACTION
REMOVAL/INSTALLATION)