S2308000120 REV.F Service Bulletin/Repair Instructions

Case Number: S2308000120 Rev. F

Release Date:
January 2026
Symptom/Vehicle Issue: Rain Sensing Auto Wipers and Auto on Head Lamps

Inoperative. Rain Sensor Internal Failure.

Models Affected:

2023-2026 Ram 1500 (DT), 2500 (DJ), 3500 (D2 and DD), 4500/5500 (DP)

2024-2026 Jeep Wagoneer S (KM)

2024-2026 Dodge Charger (LB)

2023-2026 Jeep Compass (MP)

2023-2026 Dodge Durango (WD)

2023-2026 Jeep Grand Cherokee (WL)

2023-2026 Jeep Wagoneer (WS)

2023-2026 Ram Promaster (VF)

Owner Complaint/Technician Observation: The owner complains that the rainsensitive wipers and/or the automatic headlamps are not functioning. The technician

observed one or more of the following Diagnostic Trouble Codes (DTCs) have set

dependent on the vehicle.

B221D-00 - Rain Sensor Module (RSM) Internal

B221D-49 - Rain Sensor Module (RSM) Internal Electronic Failure

B23AA-00 - Implausible Data Received from Rain Sensor - General

Electrical Failure

B225F-49 - Light sensor Internal

B11FA-49 - Humidity Sensor Internal

B2131-09 - Humidity Light Rain Light Sensor Component Failures
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.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no

solution is found

FCA US LLC
Version 4.3 10/29/2020
Repair Procedure: Verify that the auto-on wiper selection within the radio settings is

set to on and verify the customer-selected headlamp switch position is positioned for

AUTO-ON headlamps. Inspect the windshield area where the light rain sensor is

located, make sure nothing is blocking the sensor like windshield tint or any other

aftermarket equipment, make sure there are no cracks in the windshield and if a

replacement glass, inspect the area of the sensor mounting location.

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.
<<<NOTE>>> Before performing any removal or troubleshooting activity, visually

inspect the rain sensor installation from both outside and inside the vehicle.
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.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no

solution is found

FCA US LLC
Version 4.3 10/29/2020
From the outside, take clear photos showing the overall appearance of the sensor,

ensuring there are no visible air bubbles or detachment between the SilGel

membrane and the windshield.

From the inside, take photos verifying that the sensor is properly seated and fully

secured to the windshield bracket.

Attach all photos to the submitted documentation/claim before proceeding with any

further steps

1. Visually inspect the sensor at the glass, looking for air bubbles from a sensor
area that is properly wetted to the glass surface. If there are air bubbles or

any other damage to the SILGel membrane check if the windshield was

replaced recently or the sensor was removed and re-installed recently. This

issue might have been caused by not being careful enough when removing

and re-installing the sensor.

2. Functionally check the rain sensing wipers by splashing some water near the
area where the sensor is located. Ensure the vehicle is in “Park” ´position and

the ignition is on to test wipers activation. Confirm that the rain-sensitive

wipers feature is activated on the cluster screen or radio (if applicable). Note:

The wipers will not operate in the high-speed mode if the vehicle is in “Park”

or travelling below 4 MPH (7 km/h). A car wash is not a reliable test method

due to the limitations mentioned above. For the auto headlamps functional

check, block the light going into the sensor from exterior glass using an

opaque object. Ensure the headlamp switch is in auto mode and verify proper

operation.
3. Record DTCs and environmental data by checking the battery voltage
recorded when the DTC is set. If the DTC is triggered due to low battery

voltage, do not remove the sensor. Instead, erase the DTC and repeat the

process.

4. Remove the rear-view mirror cover (inside) and make sure the connector to
the sensor is secure. Use the push-pull-push method to secure a loose

connection. If the connector and harness appear undamaged, disconnect the

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.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no

solution is found

FCA US LLC
Version 4.3 10/29/2020
rain sensor, wait for 5 to 10 seconds, and reconnect it to verify proper

electrical contact. Then verify that the sensor is fully retained by the bracket,

ensuring the two steel retaining clips on the sensor are fully secured to the

housing bracket.

5. Erase the DTCs and perform a key cycle, the key cycle should be key off for 1
minute with wiTECH disconnected. Removing power from the light rain sensor

by disconnecting the vehicle battery is required for proper sensor calibration.

After performing the battery disconnect, close all doors and hood, turn the

ignition back on, and retest operation following step 2. If no DTCs return,

release the vehicle. If DTCs reappear, perform at least three key cycles to

allow the sensor to relearn its calibration. If issues persist, follow the Service

Library DTC diagnostics as needed.

<<<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 root cause analysis can be

performed by Engineering and the supplier.
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.
Contact STAR Center, or your Technical Assistance Center Via TechCONNECT or eCONTACT ticket if no

solution is found

FCA US LLC
Version 4.3 10/29/2020

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Last update on 2026-03-23 / Affiliate links / Images from Amazon Product Advertising API

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