Subaru Crosstrek Service Manual: Dtc b2304 rear radar on-off switch stuck

DTC detecting condition:

• BSD/RCTA OFF switch is stuck to ON. (Switch malfunction)

• Switch was left pressed for a prolonged time.

• Defective radar sensor

• All functions of BSD/RCTA stop.

• Fail icon is displayed in the combination meter LCD display.

• Failure-related notification is displayed for approx. two seconds on LCD display in the combination meter.

For the coupling connector, refer to “WIRING SYSTEM”.

1.CHECK METER DISPLAY.

1) Turn the ignition switch to ON.

2) Check the display of OFF indicator in the combination meter LCD display.

Does the display change according to operation of BSD/RCTA OFF switch?

Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE:

• Temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

• User may have kept pressing the switch for 30 seconds or more.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2304 REAR RADAR ON-OFF SWITCH STUCK">Go to Step 2.

2.CHECK CURRENT DATA.

Check the current data «SRVD System ON-OFF flag» of «Subaru Rear Vehicle Detection(RH)» or «Subaru Rear Vehicle Detection(LH)». Read Current Data">

Does the display change according to operation of BSD/RCTA OFF switch?

Check the combination meter. Basic Diagnostic Procedure">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2304 REAR RADAR ON-OFF SWITCH STUCK">Go to Step 3.

3.INSPECTION OF SWITCH UNIT.

Perform unit inspection of the BSD/RCTA OFF switch. Switches and Harness">

Is it normal?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2304 REAR RADAR ON-OFF SWITCH STUCK">Go to Step 4.

Replace the BSD/RCTA OFF switch. Switches and Harness">

4.CHECK BATTERY.

Check the battery. Battery">

Is it normal?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2304 REAR RADAR ON-OFF SWITCH STUCK">Go to Step 5.

Charge or replace the battery.

5.CHECK FUSE.

Check the fuse of BSD/RCTA OFF switch. Relay and Fuse">

Is it normal?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2304 REAR RADAR ON-OFF SWITCH STUCK">Go to Step 6.

Replace the fuse. If the replaced fuse blows out easily, repair the ground short circuit in harness between the fuse and the BSD/RCTA OFF switch.

6.CHECK HARNESS (OPEN CIRCUIT).

1) Disconnect the BSD/RCTA OFF switch connector.

2) Turn the ignition switch to ON.

3) Using a tester, measure the voltage between BSD/RCTA OFF switch connector and chassis ground.

Connector & terminal

(i94) No. 2 (+) — Chassis ground (−):

Is the voltage 10 V or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2304 REAR RADAR ON-OFF SWITCH STUCK">Go to Step 7.

Repair the open circuit of harness between the fuse and the BSD/RCTA OFF switch.

7.CHECK HARNESS (OPEN CIRCUIT).

1) Turn the ignition switch to OFF.

2) Disconnect the radar sensor LH connector.

3) Using a tester, measure the resistance between BSD/RCTA OFF switch connector and radar sensor LH connector (harness side).

Connector & terminal

(i94) No. 1 — (R25) No. 8:

Is the resistance less than 1 ??

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2304 REAR RADAR ON-OFF SWITCH STUCK">Go to Step 8.

Repair the open circuit of harness between BSD/RCTA OFF switch and radar sensor LH.

8.CHECK HARNESS (GROUND SHORT CIRCUIT).

Using a tester, measure the resistance between the BSD/RCTA OFF switch connector (harness side) and the chassis ground.

Connector & terminal

(i94) No. 1 — Chassis ground:

Is the resistance 1 M? or more?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2304 REAR RADAR ON-OFF SWITCH STUCK">Go to Step 9.

Repair the short circuit to ground in harness between BSD/RCTA OFF switch and radar sensor LH.

9.CHECK HARNESS (SHORT CIRCUIT TO POWER SUPPLY).

1) Turn the ignition switch to ON.

2) Using a tester, measure the voltage between the BSD/RCTA OFF switch connector (harness side) and the chassis ground.

Connector & terminal

(i94) No. 1 (+) — Chassis ground (−):

Is the voltage less than 1 V?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2304 REAR RADAR ON-OFF SWITCH STUCK">Go to Step 10.

Repair the short circuit to power supply in harness between BSD/RCTA OFF switch and radar sensor LH.

10.CHECK CONNECTOR.

Check the radar sensor LH connector.

Is there any fault? (Insecure connection, poor contact, etc.)

Repair the connector.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2304 REAR RADAR ON-OFF SWITCH STUCK">Go to Step 11.

11.CHECK BSD/RCTA.

1) Restore the vehicle to its original state.

2) Perform the Inspection Mode. Inspection Mode">

Is DTC B2304 displayed? (Current malfunction)

Replace the radar sensor LH. Radar Sensor">

Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE:

In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

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