Saab 9-5 & 9-3 Seat Memory Module Guide: Fixing Failures & Replacement Programming

Compatibility Warnings: Read This First

This Seat Memory Control Module, part number 4658480, fits a specific range of Saab vehicles, but there are critical exceptions. Please verify your vehicle carefully.

• 1998-2010 Saab 9-5: This module fits most 9-5 models. However, for the final 2010 model year, it is only correct for vehicles with 'E' as the 4th digit of the Vehicle Identification Number (VIN).
• 1998-2003 Saab 9-3: This module ONLY fits the 1998-2002 models and the 2003 Convertible and 5-door Hatchback models. It does NOT fit the 2003 Saab 9-3 Sport Sedan, which was built on a completely new platform and uses different electronics.

Symptoms of a Failing Seat Memory Module

A failing seat memory module can cause a range of frustrating electrical issues. Because it's tied into the car's data network, symptoms aren't always confined to the seat itself.

• Unresponsive Seat Controls: The most common symptom is when the power seat controls stop working entirely or work intermittently. You may press the buttons and hear nothing, or the seat may move in short, jerky pulses instead of a smooth motion.
• Memory Function Fails: The memory buttons may stop working. You might be unable to save a new position, or pressing a memory button does nothing. In some cases, the seat may move to an incorrect or random position.
• Inability to Adjust Seat: While some adjustments like forward/backward might work, other functions like tilt or height adjustment may fail.
• Erratic Behavior: The module may cause other strange electrical problems. Since it communicates with other modules, its failure can sometimes lead to communication error codes (U-codes) being logged by other systems in the car.
• Pulsing Movement: A common failure mode reported by owners is the seat moving in short bursts or pulses instead of a continuous motion, particularly when trying to move it forward or backward. This can sometimes be traced to a fault within the memory switch itself or the main module.

Associated Diagnostic Trouble Codes (DTCs)

A standard OBD-II code reader may not be able to communicate with the seat module. A more advanced scan tool, like the dealer-level Tech 2, is often required to read body-related codes. Look for "U" codes (indicating a communication problem on the data bus) or "B" codes (indicating a body-related fault). Common codes include:

• U0140: Lost Communication With Body Control Module.
• Other U-codes indicating a loss of communication with various modules.

Programming and Installation

This process, often called "marrying" the module to the car, adds it to the vehicle's network and allows it to communicate with other control units like the TWICE (Theft Warning Integrated Central Electronics) module and Body Control Module. Without proper programming, a replacement module will not function correctly, if at all. Some or all seat adjustment and memory functions will be disabled.

While some forum users have reported plug-and-play success when swapping in a used module for basic adjustment functions, this is not guaranteed and memory features will likely not work without being properly added to the car with a Tech 2. For full functionality, programming is required. This can be done by a Saab-specialist independent mechanic or a dealership with the correct tools.

Buying a Used Seat Memory Control Module

A used OEM module is an excellent, cost-effective alternative to a very expensive new part. Since these modules are electronic and require programming, here’s what to look for:

• Verify the Part Number: The most critical step is to match the part number. Ensure the used module is stamped with 4658480. Do not rely on visual similarity alone.
• Physical Inspection: Check the module for any signs of physical damage. Look for cracks in the plastic casing, bent or corroded connector pins, and any evidence of water intrusion or burning. The module is located under the driver's seat, a location that can be vulnerable to spills.
• Source Vehicle: If possible, find out the history of the donor car. A module from a lower-mileage, accident-free vehicle is always preferable.
• Return Policy: Only buy from sellers who offer a return policy. This gives you protection in case the module is Dead on Arrival (DOA), even though you will still need to have it programmed to confirm its function.

Cost Comparison

Prices can vary, but this gives a general idea of the cost for the part and installation.

Replacement Overview

Replacing the module is a straightforward job for a DIYer, but remember that programming is required afterward.

1. Disconnect the Battery: Before working on any electronic component, always disconnect the negative terminal of the car battery.
2. Access the Module: Move the driver's seat all the way up and back to get the best access to the area underneath. The module is mounted to the seat frame.
3. Unbolt the Seat (Optional but Recommended): For easier access, it is highly recommended to unbolt the driver's seat from the floor. This typically involves removing four Torx bolts at the corners of the seat rails. Tilt the seat back to reach the connectors.
4. Disconnect and Remove: Carefully disconnect the two wiring harness connectors from the module. Then, release the clips or screws holding the module to the seat frame and remove it.
5. Install the New Module: Installation is the reverse of removal. Secure the new module, reconnect the wiring harnesses, bolt the seat back down, and reconnect the battery.
6. Programming: The final step is to have the module programmed to the vehicle with a Tech 2 scan tool.

Frequently Asked Questions