2023-2025 Jeep Compass Rain Sensing Wipers and Headlamps Inoperative

Owners of 2023-2025 Jeep Compass vehicles may encounter a situation where their rain-sensing automatic wipers and automatic headlamps are not functioning as expected. This can be a significant inconvenience, especially in changing weather conditions. FCA US LLC has released Technical Service Bulletin (TSB) S2308000120 Rev. C, dated April 2025, to provide technicians with a comprehensive guide for diagnosing and resolving this specific problem.

The TSB, S2308000120 Rev. C, highlights that the malfunction often correlates with specific Diagnostic Trouble Codes (DTCs) stored in the vehicle's system, indicating issues with the rain/light sensor assembly.

Symptoms

Owners typically report that their rain-sensitive wipers do not activate automatically when it rains, or that their automatic headlamps fail to turn on or off appropriately based on ambient light conditions. This indicates a failure in the system responsible for detecting rain and light levels.

Fault Codes / DTCs

When diagnosing the inoperative rain sensing wipers or auto headlamps, technicians may find one or more of the following Diagnostic Trouble Codes (DTCs) stored in the vehicle's system:

Code	Description
B221D-49	Rain Sensor Module (RSM) Internal
B23AA-01	Implausible Data Received from Rain Sensor
B225F-49	Light sensor Internal
B11FA-49	Humidity Sensor Internal

These codes point to internal faults within the rain sensor module or issues with the data it transmits, as well as problems with the light and humidity sensing components.

Diagnosis / Trigger Conditions

Before proceeding with repairs, technicians are instructed to perform several initial checks. This includes verifying that the auto-on wiper selection is enabled within the radio settings and that the headlamp switch is correctly set to the AUTO-ON position. A visual inspection of the windshield area around the light rain sensor is crucial to ensure there are no obstructions, such as tint or aftermarket equipment, or any cracks in the glass that could interfere with sensor operation. If the windshield has been replaced, the sensor mounting location should be carefully examined.

Functional checks involve splashing water near the sensor to test the rain-sensing wipers and blocking light from the exterior glass to test the auto headlamps. These steps help confirm the presence and nature of the malfunction before deeper diagnostics begin.

Important Warnings

Technicians are advised to exercise extreme caution when working with the sensor assembly. Specifically, the TSB states: "CAUTION: During installation or removal process of the sensor, the SILGel membrane and Humidity Flex PCB must not be handled/touched, as this may cause sensor malfunctions see steps 1-5."

Owners should also be aware of the general disclaimer associated with this type of communication: "This document does not authorize warranty repairs. This communication documents a record of past experiences. STAR Online does not provide any conclusions about what is wrong with the vehicle. Rather, it captures all previous cases known that appear to be similar or related to the vehicle symptom / condition. You are the expert, and you are responsible for deciding on the appropriate course of action."

Repair Procedure Summary

The repair procedure outlined in TSB S2308000120 Rev. C involves several key steps to address the inoperative Jeep Compass rain sensing wipers and auto headlamps:

1. Visual Inspection: Technicians must visually inspect the sensor at the glass for air bubbles or damage to the SILGel membrane. This step helps identify if a previous windshield replacement or sensor re-installation might have caused the issue.
2. Functional Testing: After initial visual checks, the rain sensing functionality is tested by splashing water on the windshield. The auto headlamp function is tested by blocking light from the sensor while the headlamp switch is in auto mode.
3. DTC and Voltage Check: Diagnostic Trouble Codes and environmental data are recorded. If a low voltage DTC is present, the voltage at the sensor is checked to ensure proper battery voltage.
4. Sensor Connection and Retention: The rear-view mirror cover is removed to access the sensor connector. The connector's security is checked using a push-pull-push method, and it is disconnected to inspect for bent or pushed-out terminals. The sensor and its harness must be secure, with the two steel retaining clips fully engaged in the housing bracket.
5. DTC Erase and Sensor Calibration: After addressing any physical issues, DTCs are erased, and a key cycle is performed (key off for one minute with wiTECH disconnected). "Removing power from the light rain sensor is required for proper sensor calibration." This involves disconnecting the fuse for the light rain sensor. After ensuring all doors, hood, and gate are closed, the ignition is turned back on, and the system is re-tested. If DTCs return, a battery disconnect and three key cycles are performed to allow the sensor to relearn its calibration. If issues persist, further Service Library DTC diagnostics are recommended.

Owner Action

If you own a 2023-2025 Jeep Compass and are experiencing issues with your rain-sensing wipers or automatic headlamps, it is recommended to schedule an appointment with your authorized dealership. Inform them about the symptoms you are observing and mention Technical Service Bulletin S2308000120 Rev. C. The dealership technicians are equipped to perform the necessary diagnostic and repair procedures as outlined in the TSB.

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Source: NHTSA ID: 11017355