Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2022 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE
Automatic Light And Wiper System DTCS
AUTOMATIC LIGHT AND WIPER SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| Code | Reference |
|---|---|
| B2400 | Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2400 RAIN/LIGHT SENSOR PERFORMANCE . |
| B2401 | Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2401 SENSOR INSTALLATION INCORRECT . |
| B2402 | Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2402 SENSOR INITIAL SETTING UNFINISHED . |
| B2403 | Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2403 VEHICLE SPEED SIGNAL . |
| B2404 | Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2404 LIN COMMUNICATION . |
| B2405 | Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2405 LIGHT SENSOR DESTINATION MISMATCH . |
| B2406 | Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2406 A/S SIGNAL . |
| B2407 | Ref. to AUTOMATIC LIGHT AND WIPER (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2407 RAIN SENSOR TEMPERATURE . |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.