DTC B1869, B1870

id0802a0801300

DTC

B1869

Air bag system warning light system circuit malfunction (the air bag system warning light illuminates continuously.)

Air bag system warning light system circuit short to ground (the air bag system warning light is not illuminated continuously.)

B1870

Air bag system warning light system circuit short to power supply (the air bag system warning light is not illuminated continuously.)

DETECTION CONDITION

Warning
• Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection with only detection conditions may cause injury due to an operating error, or damage the system. When performing an inspection, always follow the inspection procedure.
• Malfunction in the air bag system warning light circuit

POSSIBLE CAUSE

• METER 10 A fuse malfunction
• Instrument cluster malfunction
• Malfunction of the connectors between the instrument cluster and SAS control module
• Open or short circuit in the wiring harness between the METER 10 A fuse and instrument cluster
• Open or short circuit in the wiring harness between the instrument cluster and SAS control module
• SAS control module malfunction

Diagnostic procedure

Step

Inspection

Action

1
INSPECT METER 10 A FUSE
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable.
• Remove the METER 10 A fuse.
• Is the fuse normal?
Yes
Reinstall the METER 10 A fuse, then go to the next step.
No
Replace the METER 10 A fuse.
2
INSPECT FOR CONTINUITY BETWEEN METER 10 A FUSE AND INSTRUMENT CLUSTER
• Connect the negative battery cable.
• Turn the ignition switch to the ON position.
• Measure voltage at instrument cluster connector terminal 2V.
• Is the voltage 9 V or more?
Yes
Go to the next step.
No
Repair the related wiring harness.
3
INSPECT WIRING HARNESS BETWEEN INSTRUMENT CLUSTER AND SAS CONTROL MODULE
Warning
• Handling the air bag system components improperly can accidentally deploy the air bag modules and pre-tensioner seat belts, which may seriously injure you. Read the service warnings and cautions before handling the air bag system components.
(See SERVICE WARNINGS.)
(See SERVICE CAUTIONS.)
• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable and wait for 1 min or more.
• Remove the column cover.
• Disconnect the clock spring connector.
• Remove the passenger-side air bag module.
• Remove the driver and passenger-side B-pillar lower trim.
• Disconnect the driver and passenger-side pre-tensioner seat belt connectors.
• Remove the console.
• Disconnect the SAS control module connector.
• Disconnect the instrument cluster connector.
• Inspect the wiring harness between SAS control module terminal 2W and instrument cluster terminal 1O for the following:
- Short to ground
- Short to power supply
- Open circuit
• Is the wiring harness normal?
Yes
Go to the next step.
No
Replace the air bag wiring harness.
4
INSPECT AIR BAG SYSTEM WARNING LIGHT
• Connect the instrument cluster connector.
• Connect the negative battery cable.
• Turn the ignition switch to the ON position.
• Does the air bag system warning light illuminate?
Yes
Go to the next step.
No
Replace the instrument cluster.
5
INSPECT AIR BAG SYSTEM WARNING LIGHT
• Ground instrument cluster terminal 1O to the body using a jumper wire.
• Does the air bag system warning light go out?
Yes
Replace the SAS control module.
No
Replace the instrument cluster.