Mazda 6 2002, Workshop Manual

Page: 1134 / 1248

T–226
ON-BOARD DIAGNOSTIC [AIR BAG SYSTEM]
DTC B2777, B2778, B2779, B2780
A6E817401046W24
Diagnostic procedure
DTC
B2777 Passenger-side curtain air bag module system resistance low
B2778 Passenger-side curtain air bag module system resistance high
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
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 1.4—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
POSSIBLE
CAUSE
•
Open or short circuit in wiring harness between passenger-side curtain air bag module and SAS unit
•
Passenger-side curtain air bag module malfunction
•
SAS unit malfunction
STEP INSPECTION ACTION
1 INSPECT PASSENGER-SIDE CURTAIN AIR
BAG MODULE
•
Check following PID/DATA monitor, using
SST (WDS or equivalent).
(See T–195 PID/DATA MONITOR TABLE )
— PC_CURTN
•
Is resistant value of passenger-side curtain
air bag module normal?
— Resistance:
1.4—3.2 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 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 WARNINGS )
•
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?
Yes Replace wiring harness.
No Go to next step.