DTC B1992, B1993, B1994, B1995

id080200801900

DTC

B1992

Driver‐side side air bag module circuit short to power supply

B1993

Driver‐side side air bag module circuit short to ground

B1994

Driver‐side side air bag module circuit resistance high

B1995

Driver‐side side air bag module circuit resistance low
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.
•  Resistance other than 1.4—3.2 ohms detected in driver-side side air bag module circuit
•  Malfunction in wiring harness between driver-side side air bag module and SAS control module
POSSIBLE CAUSE
•  Driver-side side air bag module connector malfunction
•  Open or short circuit in wiring harness between driver-side side air bag module and SAS control module
•  Driver-side side air bag module malfunction
•  SAS control module malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT DRIVER‐SIDE SIDE AIR BAG MODULE CONNECTOR
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 the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Remove the driver-side side air bag module.
•  Disconnect the driver-side side air bag module connector.
•  Inspect the driver-side side air bag module connector. (Corrosion, damage, and disconnected pins)
•  Is there any malfunction of the driver-side side air bag module connector?
Yes
Replace the driver-side side air bag module wiring harness.
No
Go to the next step.
2
INSPECT WIRING HARNESS BETWEEN DRIVER-SIDE SIDE AIR BAG MODULE AND SAS CONTROL MODULE
•  Disconnect the driver-side side air bag module connector.
•  Remove the console.
•  Disconnect the SAS control module connectors.
•  Inspect the wiring harness between SAS control module connector terminal 2M and driver-side side air bag module connector terminal A, SAS control module connector terminal 2O and driver-side side air bag module connector terminal B 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 the driver-side side air bag module.
•  Is the wiring harness normal?
Yes
Go to the next step.
No
Replace the wiring harness between the SAS control module and the driver-side side air bag module.
3
INSPECT THE WIRING HARNESS BETWEEN THE SAS CONTROL MODULE AND DRIVER-SIDE SIDE AIR BAG MODULE 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 the ON position with SAS control module connector and driver-side side air bag module connector disconnected.
•  Measure the voltage of SAS control module connector terminals 2M and 2O.
Note
•  Measure the voltage while shaking the wiring harness between the SAS control module and the driver-side side air bag module.
•  Is the voltage measured?
Yes
Replace the wiring harness between the SAS control module and the driver-side side air bag module.
No
Go to the next step.
4
INSPECT DRIVER-SIDE SIDE AIR BAG MODULE
•  Turn the ignition (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Connect the SST (Fuel and thermometer checker) or apply 2 ohms resistance to the driver-side side air bag module connector terminals A and B.
•  Set the SST (Fuel and thermometer checker) to 2 ohms.
•  Except for the driver-side side air bag module connector, 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 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
Go to the next step.
No
Replace the driver-side side air bag module.
(See SIDE AIR BAG MODULE 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 the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Disconnect the SST (Fuel and thermometer checker) or the 2 ohms resistance.
•  Connect the driver-side side air bag module connector.
•  Connect the negative battery cable.
•  Turn the ignition (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) 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.