2023-2025 Jeep/RAM Wipers & Headlamps Inoperative TSB S2308000120

Owners of various 2023-2025 Jeep and RAM models might encounter a frustrating problem where their rain sensing wipers and automatic headlamps fail to operate. This issue, officially described as "Rain Sensing Auto Wipers and Auto on Head Lamps Inoperative," can be caused by several factors, including internal sensor faults or improper installation.

This technical service bulletin (TSB) S2308000120 Rev. D, released in May 2025, provides technicians with a detailed procedure to diagnose and resolve these concerns. If you own a 2023-2025 Jeep Compass or another affected model and are experiencing these symptoms, it's important to have your vehicle inspected.

Symptoms

The primary symptom owners will notice is that the rain-sensitive wipers and/or the automatic headlamps are not functioning as expected. This means the wipers may not activate automatically in rain, or the headlamps may not switch on or off based on ambient light conditions.

Fault Codes / DTCs

Technicians may find one or more of the following Diagnostic Trouble Codes (DTCs) stored in the vehicle's system, indicating a problem with the rain and light sensor module:

Code	Description
B221D-00	Rain Sensor Module (RSM) Internal
B221D-49	Rain Sensor Module (RSM) Internal Electronic Failure
B23AA-01	Implausible Data Received from Rain Sensor - General Electrical Failure
B225F-49	Light sensor Internal
B11FA-49	Humidity Sensor Internal

Important Warnings

There are critical warnings for technicians and owners related to the repair of this system:

• Sensor Handling Caution: "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." This highlights the delicate nature of the sensor components.
• Parts Protection: "NOTE: Removed parts must be protected using the plastic cover from the new part, and tape should be applied to prevent the removed part from being further damaged during shipping." This ensures that engineering can perform root cause analysis on failed components.

Diagnosis and Trigger Conditions

Before proceeding with repairs, technicians are instructed to verify several conditions:

• Check that the auto-on wiper selection is enabled in the radio settings.
• Confirm the headlamp switch is set to the AUTO-ON position.
• Visually inspect the windshield area around the light rain sensor. Ensure there are no obstructions like tint or aftermarket equipment, no cracks in the glass, and proper mounting if the windshield was replaced.
• The TSB also advises checking for air bubbles or damage to the SILGel membrane, which can indicate improper sensor installation or a recently replaced windshield.
• When testing the rain sensing wipers, the vehicle must be in "Park" with the ignition on. Wipers will not operate in high-speed mode if the vehicle is in "Park" or traveling below 4 MPH (7 km/h). A car wash is not a reliable test method.
• For headlamp function, block light to the sensor with an opaque object while the switch is in auto mode.
• DTCs and environmental data, particularly battery voltage, should be recorded. If low battery voltage is the cause of a DTC, the sensor should not be removed; instead, the DTC should be erased and the process repeated.

Repair Procedure Summary

The repair process for the "Jeep Compass rain sensing wipers" and automatic headlamp issue involves several steps:

1. Initial Checks: Verify radio settings and headlamp switch position. Inspect the windshield and sensor area for blockages, cracks, or improper installation.
2. Sensor Inspection: Visually check the sensor at the glass for air bubbles or damage to the SILGel membrane, especially if the windshield or sensor was recently serviced.
3. Functional Test: Test the rain-sensing wipers by splashing water on the sensor area and verify headlamp operation by blocking light to the sensor.
4. DTC and Battery Check: Record DTCs and environmental data. If low battery voltage is the cause, erase the DTC and retest, avoiding sensor removal.
5. Connector and Mounting Check: Remove the rear-view mirror cover to access the sensor connector. Ensure the connector is secure using the push-pull-push method. Disconnect and inspect for bent or pushed-out terminals. Verify the sensor and its harness are secure and that the sensor is fully retained by its bracket and clips.
6. Sensor Calibration/Relearn: Erase DTCs and perform a key cycle (key off for 1 minute with wiTECH disconnected). Power must be removed from the light rain sensor for proper calibration, typically by disconnecting its fuse. After ensuring all doors, hood, and gate are closed, turn the ignition back on and retest the system. If DTCs return, a battery disconnect followed by at least three key cycles is required for the sensor to relearn calibration. If issues persist, further Service Library DTC diagnostics are recommended.

Owner Action

If your 2023-2025 Jeep Compass, or any other affected Jeep or RAM vehicle, is experiencing inoperative rain sensing wipers or automatic headlamps, it is recommended to schedule an appointment with your dealership. While the TSB provides detailed repair steps for technicians, attempting to diagnose or repair this system yourself could lead to further complications, especially given the sensitive nature of the sensor components. The dealership will be able to perform the necessary diagnostics and apply the repair outlined in TSB S2308000120 Rev. D.

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Source: NHTSA ID: 11018444