DTC B1869, B1870

id080200801300

DTC

B1869

Air bag system warning light system circuit open or short to ground

B1870

Air bag system warning light 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.
• Malfunction in air bag system warning light circuit

POSSIBLE CAUSE

• METER IG 15 A fuse malfunction
• Instrument cluster malfunction
• Malfunction of connectors between instrument cluster and SAS unit
• Open or short circuit in wiring harness between METER IG 15 A fuse and instrument cluster
• Open or short circuit in wiring harness between instrument cluster and SAS unit
• SAS unit malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

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?
Yes
Reinstall METER IG 15 A fuse, then go to next step.
No
Replace METER IG 15 A fuse.
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?
Yes
Go to next step.
No
Repair wiring harness.
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 SERVICE WARNINGS)
• 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?
Yes
Go to next step.
No
Replace wiring harness.
4
INSPECT AIR BAG SYSTEM WARNING LIGHT
• Connect instrument cluster.
• Turn ignition switch to ON position.
• Is air bag system warning light illuminated?
Yes
Go to next step.
No
Replace instrument cluster.
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?
Yes

[Present malfunction diagnosis]

Replace SAS unit.

[Past malfunction diagnosis]

Troubleshooting completed.
No
Replace instrument cluster.