Mazda 6 2002 Workshop Manual page 1052

DTC B1871 End Of Sie
DTC B1871 Occupancy sensor system (communication error, sensor internal circuit abnomal)
Warning
• • • • Detection conditions are for understanding DTC outline before performing inspection.
DETECTION
CONDITION
• Malfunction in wiring harness between SAS unit and occupancy sensor
• Malfunction in occupancy sensor circuit
• Open or short circuit in wiring harness between METER IG 15 A fuse and occupancy sensor
• Open or short circuit in wiring harness between SAS unit and occupancy sensor
POSSIBLE
• Open circuit in wiring harness between occupancy sensor and ground
CAUSE
• Occupancy sensor malfunction
• SAS unit malfunction
Diagnostic procedure
STEP
1 • Is vehicle equipped with passenger-side air bag
cut-off function?
T–200
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
Yes Go to net step.
No [Present malfunction diagnosis]
Replace SAS unit.
(See T–124 SAS UNIT
[Past malfunction diagnosis]
Troubleshooting completed.
A6E817401046W08
ACTION
REMOVAL/INSTALLATION)