DTC B1869 [AIR BAG SYSTEM]

id0802a0803400


System Malfunction Location

DTC

System Malfunction Location

M-MDS display
B1869
Air bag system warning light circuit open (the air bag system warning light is continuously illuminated.)
Air bag system warning light circuit short to body ground (the air bag system warning light is never illuminated.)


Detection Condition

Warning
•  Detection conditions are for understanding the DTC outline before performing an inspection. Performing an inspection according to only the 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 Causes

•  Open or short circuit in the wiring harness between the battery and the instrument cluster
•  Open or short circuit in the wiring harness between the instrument cluster and SAS control module
•  Instrument cluster malfunction
•  SAS control module malfunction

System Wiring Diagram

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Diagnostic Procedure

STEP

INSPECTION

ACTION
1
INSPECT FOR CONTINUITY BETWEEN BATTERY AND INSTRUMENT CLUSTER
•  Turn the ignition switch to the ON position.
•  Measure the voltage at instrument cluster connector terminal 1G.
Note
•  Measure the voltage while shaking the wiring harness between the battery and instrument cluster.
•  Is the voltage 9 V or more?
Yes
Go to the next step.
No
Repair the related wiring harness.
2
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.
•  Turn the ignition switch to the LOCK position.
•  Remove the battery cover.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Remove the column cover.
•  Disconnect the clock spring connector.
•  Remove the glove compartment.
•  Disconnect the passenger-side air bag module connector. (See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)
•  Disconnect the driver and passenger-side seat connectors.
•  Remove the back trim.
•  Remove the driver and passenger-side pre-tensioner seat belt connectors.
•  Remove the console panel.
•  Disconnect the SAS control module connectors.
•  Disconnect the instrument cluster connector.
•  Inspect the wiring harness between SAS control module terminal 1R and instrument cluster terminal 2K for the following:
―  Short circuit between terminals
―  Short to body ground
―  Open circuit
Note
•  Inspect for continuity while shaking the wiring harness between the SAS control module and instrument cluster.
•  Is the wiring harness normal?
Yes
Go to the next step.
No
Replace the wiring harness between the SAS control module and the instrument cluster.
3
INSPECT THE WIRING HARNESS BETWEEN THE SAS CONTROL MODULE AND INSTRUMENT CLUSTER FOR A SHORT CIRCUIT TO THE POWER SUPPLY
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position with SAS control module connector and instrument cluster connector disconnected.
•  Measure the voltage of SAS control module connector terminal 1R.
Note
•  Measure the voltage while shaking the wiring harness between the SAS control module and instrument cluster.
•  Is the voltage measured?
Yes
Replace the wiring harness between the SAS control module and the instrument cluster.
No
Go to the next step.
4
INSPECT AIR BAG SYSTEM WARNING LIGHT
•  Turn the ignition switch to the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Connect the instrument cluster connector.
•  Ground instrument cluster connector terminal 2K to the body using a jumper wire.
•  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.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
5
PERFORM SAS CONTROL MODULE DTC INSPECTION
•  Turn the ignition switch to the LOCK position.
•  Disconnect the negative battery cable and wait for 1min or more.
•  Reconnect all disconnected connectors.
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position.
•  Clear the DTC for the SAS control module using the M-MDS.
•  Perform the DTC inspection for the SAS control module using the M-MDS.
•  Are the same DTCs present?
Yes
Replace the SAS control module.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.