Mazda 6 2002 Workshop Manual page 1051

ON-BOARD DIAGNOSTIC [AIR BAG SYSTEM]
Diagnostic procedure
STEP
1 INSPECT METER IG 15 A FUSE
• Turn ignition switch to LOCK position.
• Disconnect negative battery cable.
• Remove METER IG 15 A fuse.
• Is fuse okay?
2 INSPECT FOR CONTINUITY BETWEEN
METER IG 15 A FUSE AND INSTRUMENT
CLUSTER
• Connect negative battery cable.
• Turn ignition switch to ON position.
• Measure voltage at instrument cluster
connector terminal 2V.
• Is voltage more than 9 V?
3 INSPECT WIRING HARNESS BETWEEN
INSTRUMENT CLUSTER AND SAS UNIT
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 column cover.
• Disconnect clock spring connector.
• Remove glove compartment.
• Disconnect passenger-side air bag module
connector.
• Disconnect driver and passenger-side
curtain air bag module connectors. (Vehicles
with curtain air bag)
• Disconnect driver and passenger-side side
air bag module connectors. (Vehicles with
side air bag)
• Remove B-pillar lower trims. (Vehicle with
pre-tensioner seat belt)
• Disconnect driver and passenger-side pre-
tensioner seat belt connectors. (Vehicle with
pre-tensioner seat belt)
• Turn up floor covering.
• Disconnect all SAS unit connectors.
• Disconnect instrument cluster.
• Inspect following wiring harness between
SAS unit and instrument cluster terminals for
short to ground, short to power supply, and
open circuit:
— 1T—1O
• Is wiring harness okay?
4 INSPECT AIR BAG SYSTEM WARNING
LIGHT
• Connect instrument cluster.
• Turn ignition switch to ON position.
• Is air bag system warning light illuminated?
5 INSPECT AIR BAG SYSTEM WARNING
LIGHT
• Using a jumper wire, cause a short circuit
between instrument cluster terminal 1O and
ground.
• Does air bag system warning light go out?
INSPECTION
WARNINGS)
Yes Reinstall METER IG 15 A fuse, then go to net step.
No Replace METER IG 15 A fuse.
Yes Go to net step.
No Repair wiring harness.
Yes Go to net step.
No Replace wiring harness.
Yes Go to net step.
No Replace instrument cluster.
(See T–72 INSTRUMENT CLUSTER REMOVAL/
INSTALLATION)
Yes [Present malfunction diagnosis]
Replace SAS unit.
(See T–124 SAS UNIT
[Past malfunction diagnosis]
Troubleshooting completed.
No Replace instrument cluster.
(See T–72 INSTRUMENT CLUSTER REMOVAL/
INSTALLATION)
ACTION
REMOVAL/INSTALLATION)
T–199
T