: Toggling the "Auto" climate control mode will fail to clear the glass effectively, forcing you to manually blast the front defroster button. Primary Causes of the Failure
Use a Jaguar Land Rover (JLR) diagnostic tool (like SDD or Pathfinder) to clear the code. If it returns immediately, the fault is active. Check Power and Ground:
Jaguar and Land Rover often share this part. You can sometimes find the Jaguar-branded version at a lower price even though they are identical.
When the TSM is stuck in a boot loop, it never goes to "sleep." This keeps the vehicle’s CAN (Controller Area Network) bus awake, leading to parasitic drain. Owners often complain of a "dead battery" after leaving the car parked for 48 hours. land rover jaguar b13c2-49
| Cause | Description | | :--- | :--- | | | The sensor's internal electronics suffer an internal electronic failure. This is the most frequently reported cause, especially in vehicles of a certain age. | | Faulty Sensor Wiring | Damaged, corroded, or loose wiring or connectors in the sensor's electrical circuit can cause an intermittent signal, triggering the fault code. | | Weak or Failing Vehicle Battery | Modern Land Rovers and Jaguars have numerous sensitive electronic modules. A battery with insufficient voltage can cause them to malfunction and generate incorrect DTCs. | | CAN Bus Communication Issues | In some cases, the code may originate from a communication problem within the vehicle's main data network (CAN bus), which can stem from a wiring issue or a failing control module. |
| Part Number | Brand | Description | | :--- | :--- | :--- | | | Land Rover | This is often cited as the primary OEM (Original Equipment Manufacturer) part number for the misting/humidity sensor. | | LR025888 | Land Rover | Another OEM number for the same sensor, sometimes used for earlier models or different trims. | | BJ32-18D693-BA | Land Rover (Late) | The official Land Rover part number for later production models. | | C2D21168 | Jaguar (Cross-Reference) | Jaguar's OEM number for the same sensor. As noted in owner forums, parts from the sister brand are often cheaper and identical. |
Top causes:
If you need an actual or part lookup , reply with:
Reconnect the electrical harness, clip the plastic mirror shroud back together, and clear the fault codes with your diagnostic tool.
If you own a modern Land Rover or Jaguar (such as the Discovery Sport, Range Rover Evoque, or various Jaguar sedans), you may encounter a climate control issue coupled with a cryptic diagnostic trouble code (DTC). Specifically, the code is a common, yet often misunderstood, fault that directly affects the automatic climate control system. : Toggling the "Auto" climate control mode will
. This multi-functional sensor—often referred to as the humidity sensor, windshield temperature sensor, or climate control sensor—is located directly behind the interior rearview mirror. When it suffers from a system internal failure, the vehicle's automatic climate control can no longer accurately read interior humidity or glass temperature, leading to persistent windshield fogging and sub-optimal HVAC performance. What is the Windshield Misting Sensor?
Recommend that can clear this specific code. Let me know how you'd like to proceed with the repair . Jaguar Land Rover DTC B13C2-49 Guide | PDF - Scribd