DTC B2438, B2439, B2692

id080200802600

DTC

B2438

Passenger‐side front buckle switch circuit short to body ground

B2439

Passenger-side front buckle switch circuit resistance not within specification

B2692

Passenger‐side front buckle switch circuit open or short to power supply
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 passenger-side front buckle switch circuit
POSSIBLE CAUSE
•  Passenger-side front buckle switch connector malfunction
•  Passenger-side front buckle switch malfunction
•  Open or short circuit in the wiring harness between the passenger-side front buckle switch and body ground
•  Open or short circuit in the wiring harness between the passenger-side front buckle switch and SAS unit
•  SAS unit malfunction

Diagnostic procedure

Step

Inspection

Action
1
INSPECT PASSENGER-SIDE FRONT BUCKLE SWITCH CONNECTOR
Warning
•  Handling the component parts improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the service warnings/cautions and the workshop manual before handling the air bag system components.
•  Turn the ignition switch to the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Disconnect the passenger-side front buckle switch connector. (See FRONT BUCKLE REMOVAL/INSTALLATION.)
•  Is there any malfunction of the passenger-side front buckle switch connector?
Yes
Replace the passenger-side front buckle switch wiring harness.
No
Go to the next step.
2
INSPECT PASSENGER-SIDE FRONT BUCKLE SWITCH
•  Inspect the passenger-side front buckle switch.
•  Is the passenger-side front buckle switch normal?
Yes
Go to the next step.
No
Replace the passenger-side front buckle switch.
(See FRONT BUCKLE REMOVAL/INSTALLATION.)
3
INSPECT WIRING HARNESS BETWEEN PASSENGER-SIDE BUCKLE SWITCH AND GROUND
•  Inspect the wiring harness between passenger-side front buckle switch terminal H and ground for the following:
―  Open circuit
Note
•  Measure the voltage while shaking the wiring harness between the SAS unit and passenger-side front buckle switch.
•  Is the wiring harness normal?
Yes
Go to the next step.
No
Replace the wiring harness.
4
INSPECT WIRING HARNESS BETWEEN SAS UNIT AND PASSENGER-SIDE BUCKLE SWITCH
•  Remove the column cover.
•  Disconnect the clock spring connector.
•  Remove the glove compartment.
•  Disconnect the passenger-side air bag module connector.
•  Disconnect the driver and passenger-side curtain air bag module connectors.
•  Disconnect the driver and passenger-side side air bag module connectors.
•  Remove the rear door lower trim.
•  Disconnect the driver and passenger-side pre-tensioner seat belt connectors.
•  Partially peel back the floor covering.
•  Disconnect the SAS unit connector.
•  Inspect the wiring harnesses between SAS unit connector terminal 2H and passenger-side front buckle switch connector terminal G, for the following:
―  Short to body ground
―  Open circuit
―  Short circuit between terminals
Note
•  Inspect for continuity while shaking the wiring harness between the SAS unit and passenger-side front buckle switch.
•  Is the wiring harness normal?
Yes
Go to the next step.
No
Replace the wiring harness between the SAS unit and the passenger-side front buckle switch.
5
INSPECT THE WIRING HARNESS BETWEEN THE SAS UNIT AND PASSENGER-SIDE BUCKLE SWITCH FOR A SHORT CIRCUIT TO THE POWER SUPPLY
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position with SAS unit connector and passenger-side front buckle switch connector disconnected.
•  Measure the voltage of SAS unit connector terminals 2H of SAS unit harness side connector.
Note
•  Measure the voltage while shaking the wiring harness between the SAS unit and passenger-side front buckle switch.
•  Is the voltage measured?
Yes
Replace the wiring harness between the SAS unit and the passenger-side front buckle switch.
No
Go to the next step.
6
INSPECT DTCs
•  Turn the ignition switch to the LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Reconnect all disconnected connectors
•  Connect the negative battery cable.
•  Turn the ignition switch to the ON position.
•  Clear DTCs using the WDS or eguivalent. (See CLEARING DTC.)
•  Perform the DTC inspection for the SAS unit using the WDS or eguivalent. (See DTC DISPLAY.)
•  Are the same DTCs present?
Yes
Replace the SAS unit.
(See SAS UNIT REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.