DTC B2438, B2439, B2692


BHE080201046W23

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

• Malfunction of the connectors between the passenger-side front buckle switch and SAS unit
• Open or short circuit in the wiring harness between the passenger-side front buckle switch and SAS unit
• Passenger-side front buckle switch malfunction
• SAS unit malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT PASSENGER-SIDE BUCKLE SWITCH CIRCUIT

• Using the WDS or equivalent, verify the following PID/DATA monitor.
– PS_BUKL
• Is the passenger-side buckle switch normal?
Yes

Present malfunction diagnosis:

• Replace SAS unit.

Past malfunction diagnosis:

• DTC troubleshooting completed.
No
Go to the next step.
2

INSPECT PASSENGER-SIDE BUCKLE MODULE

• Turn the ignition switch to the LOCK position.
• Disconnect the negative battery cable and wait for 1 min or more.
• Remove the passenger-side front buckle.
• 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.
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:
– Short to power supply
– Open circuit
• Is the wiring harness normal?
Yes
Go to the next step.
No
Replace the wiring harness.
4

INSPECT WIRING HARNESS BETWEEN PASSENGER-SIDE BUCKLE SWITCH AND SAS UNIT

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.)
(SeeSERVICE 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 glove compartment.
• Disconnect the passenger-side air bag module connector.
• Disconnect the driver and passenger-side side air bag module connectors.
• Disconnect the driver and passenger-side curtain 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 harness between SAS unit terminal 2H and passenger-side front buckle switch terminal G for the following:
– Short to ground
– Short to power supply
– Open circuit
• Is the wiring harness normal?
Yes

[Present malfunction diagnosis]

• Replace the SAS unit.

[Past malfunction diagnosis]

• DTC troubleshooting completed.
No
Replace the wiring harness.