Mazda 6 2002 Workshop Manual page 1078

DTC B2777, B2778, B2779, B2780
B2777 Passenger-side curtain air bag module system resistance low
B2778 Passenger-side curtain air bag module system resistance high
DTC
B2779 Passenger-side curtain air bag module system circuit short to ground
B2780 Passenger-side curtain air bag module system circuit short to power supply
Warning
• • • • Detection conditions are for understanding DTC outline before performing inspection.
DETECTION
CONDITION
• Abnormal resistance (other than 1.4—3.2 ohm) detected in passenger-side curtain air bag module
circuit
• Malfunction in wiring harness between passenger-side curtain air bag module and SAS unit
• Open or short circuit in wiring harness between passenger-side curtain air bag module and SAS unit
POSSIBLE
• Passenger-side curtain air bag module malfunction
CAUSE
• SAS unit malfunction
Diagnostic procedure
STEP
1 INSPECT PASSENGER-SIDE CURTAIN AIR
BAG MODULE
• Check following PID/DATA monitor, using
SST (WDS or equivalent).
(See T–195 PID/DATA MONITOR
— PC_CURTN
• Is resistant value of passenger-side curtain
air bag module normal?
— Resistance: 1.4—3.2 ohm
2 INSPECT PASSENGER-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 T–117 SERVICE
• Turn ignition switch to LOCK position.
• Disconnect negative battery cable and wait
for more than 1 minute.
• Disconnect passenger-side curtain air bag
module connector.
• Is there cracking or chipping in passenger-
side curtain air bag module connector?
T–226
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.
A6E817401046W24
ACTION
REMOVAL/INSTALLATION)