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 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 air bag system warning light circuit
POSSIBLE CAUSE
•  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

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT FOR CONTINUITY BETWEEN BATTERY AND INSTRUMENT CLUSTER
•  Turn the ignition (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to ON position.
•  Measure the voltage at instrument cluster connector terminal 2C.
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 (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to 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 glove compartment. (Vehicles with passenger-side air bag)
•  Disconnect the passenger‐side air bag module connector. (Vehicles with passenger-side air bag)
•  Disconnect the driver and passenger‐side seat connectors. (Vehicles with side air bag)
•  Disconnect the driver and passenger-side pre-tensioner seat belt connectors. (Vehicle with pre-tensioner seat belt)
•  Remove the console.
•  Disconnect the all SAS control module connectors.
•  Disconnect the instrument cluster.
•  Inspect the wiring harness between SAS control module terminal 1T and instrument cluster terminal 1H 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 (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to ON position with SAS control module connector and instrument cluster connector disconnected.
•  Measure the voltage of SAS control module connector terminal 1W.
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 (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Connect the instrument cluster connector.
•  Ground instrument cluster connector terminal 1H to the body using a jumper wire.
•  Connect the negative battery cable.
•  Turn the ignition (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to 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 (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to 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 (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to 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.