Ram, Grand Caravan & Town & Country Heated Seat Module Guide (2011-2020)

Is This a Body Control Module (BCM)?

No. It is important to understand that this part, commonly referred to by Mopar part numbers like 05026629AL, is the Heated Seat Module (HSM) or Heated Seat/Steering Wheel Module. It is a separate, smaller computer that controls only the heating functions for the front seats and steering wheel. The main Body Control Module (BCM) is a much more complex unit that manages a wide range of other vehicle functions like power windows, door locks, lighting, and security systems. Misidentifying this part can lead to incorrect diagnosis and purchasing the wrong component.

Symptoms of a Failing Heated Seat Module

When the HSM begins to fail, you will notice issues specifically related to the heated seats and steering wheel. Before assuming the module is bad, always check the fuse for the heated seats first. 🎬 See: How to find and check the heated seat fuse Also, inspect the wiring and connectors under the driver's and passenger's seats, as damaged wires can cause identical symptoms. A common point of failure is the wiring within the seat's heating pad itself.

• Heated Seats or Steering Wheel Not Working: The most obvious symptom is a complete failure of one or both heated seats or the heated steering wheel to turn on.
• Intermittent Operation: The features may work sometimes and not others. In some cases, the heated seat may turn on but then shut off by itself after a few seconds.
• Indicator Lights Don't Stay On: You might press the button, see the light turn on for a moment, and then immediately turn off.
• Seats Stuck On: In rare cases, the module can fail in a way that keeps the seat heaters on constantly, which can be a discomfort and a drain on the battery. If this happens, you should pull the fuse for the system until it can be repaired.
• Communication (U-series) or Body (B-series) DTCs: A failing module can set Diagnostic Trouble Codes (DTCs) that can be read with a capable OBD-II scanner.

Programming and Calibration Requirements

After installing a new or used HSM, a procedure called "Proxy Configuration Alignment" must be performed with a compatible diagnostic scan tool. This process syncs the new module with the vehicle's main computer systems, telling it which options are installed (e.g., heated steering wheel, specific seat types). Failure to perform this step will result in the module not functioning correctly.

• Dealer Tool: A Chrysler/Dodge/Ram dealer can perform the proxy alignment using their wiTECH diagnostic software.
• Advanced DIY/Independent Shop: For DIY mechanics and independent shops, software like AlfaOBD paired with a compatible OBD-II interface is capable of performing the proxy alignment procedure. This is a popular option discussed in owner forums.

Buying a Used Heated Seat Module

Purchasing a used OEM module is a cost-effective way to restore your heated seats. Because this is an electronic component, careful inspection and verification are key.

• Match the Part Number Exactly: The most critical step is to match the Mopar part number on your original module to the used one you are buying. While part numbers may be superseded (e.g., 'AF' replaced by 'AH', then 'AI', etc.), ensure the replacement is a valid substitute for your original.
• Check Vehicle Options: This module is sensitive to vehicle options. For Ram trucks, ensure the donor vehicle did NOT have ventilated (cooled) seats if your truck does not. For Chrysler Town & Country and Dodge Grand Caravan models, the module must come from a vehicle with a heated steering wheel but WITHOUT heated second-row seats.
• Inspect for Corrosion: The module is often located under the driver's seat, making it vulnerable to moisture from spilled drinks or wet carpets. Carefully inspect the electrical connector pins on the used module for any signs of green or white corrosion, which indicates water damage.
• Source from a Reputable Seller: Buy from a seller who offers a warranty and a return policy. This protects you in case the module is dead on arrival.
• Factor in Programming Costs: Remember that you will need to have the module programmed to your vehicle. Factor in the cost of a dealer visit or the purchase of DIY software like AlfaOBD when comparing prices.

Replacement Overview

The Heated Seat Module is typically located under the driver's front seat, mounted to the seat frame. The replacement process is moderately easy for a DIYer, with the main challenge being the subsequent programming.

1. Disconnect the Battery: Always disconnect the negative battery terminal before working on any electronic components, especially those near airbag systems.
2. Unbolt the Driver's Seat: Move the seat to access and remove the four bolts holding it to the floor.
3. Tilt and Disconnect: Carefully tilt the seat backward to access the wiring underneath. Disconnect the main electrical connectors, including the large yellow airbag connector.
4. Remove the Seat: Once all connectors are free, you can remove the seat from the vehicle for easier access.
5. Swap the Module: The HSM is usually held to the seat frame with clips or small bolts. Unplug the connectors, swap the module, and reconnect everything.
🎬 Watch: Step-by-step heated seat module replacement guide
6. Reinstall and Reconnect: Reinstall the seat, reconnect all electrical harnesses, and finally, reconnect the negative battery terminal.
7. Perform Proxy Alignment: The final, mandatory step is to perform the proxy configuration alignment.

Cost Comparison

Frequently Asked Questions