This article delves into the diagnostic trouble code (DTC) B1336, which indicates that the Memory Seat Module (MSM) is drawing excessive current (more than 81 amps). Understanding the causes, symptoms, and troubleshooting steps for this code is crucial for diagnosing and resolving issues with your vehicle's memory seat system. This can range from a simple wiring issue to a failing MSM itself.
Overview of B1336
The B1336 DTC signals a potential problem within the memory seat system. This system allows drivers to store and recall preferred seat positions, enhancing comfort and convenience. When the MSM detects a current draw exceeding 81 amps, it sets this code, indicating a fault that requires investigation. Ignoring this code can lead to further damage or system malfunction.
| Topic | Description | Possible Causes |
|---|---|---|
| Definition | Memory Seat Module (MSM) current exceeds 81 amps. | Short circuit in the seat motor(s), wiring harness, or within the MSM itself. Internal MSM failure. Binding or obstruction preventing seat motor movement. Low voltage to the MSM. Seat is mechanically locked. |
| Symptoms | Memory seat functionality lost or intermittent. Seat moves slowly or erratically. Blown fuses related to the seat system. Battery drain. Seat not moving at all. Clicking noises from under the seat. Warning lights on the dashboard. | |
| Diagnostic Steps | Visual inspection, fuse check, wiring harness testing, seat motor testing, MSM power and ground verification, scan tool data monitoring, component replacement (motor, MSM). | |
| Affected Components | Memory Seat Module (MSM), seat motors (fore/aft, up/down, tilt), wiring harness, fuses, circuit breakers. | |
| Severity | Moderate to High. Can cause system failure, battery drain, and potential fire hazard if left unaddressed. | |
| Related DTCs | B1335, B1337, B1338, B1339, codes related to individual seat motor circuits, power supply issues to the MSM. | |
| Possible Solutions | Repair or replace damaged wiring, replace faulty seat motors, replace faulty MSM, address mechanical binding, ensure proper power and ground to the MSM. | |
| Tools Required | Multimeter, scan tool, wiring diagrams, basic hand tools. | |
| Estimated Repair Cost | Varies widely depending on the cause, ranging from a few dollars for a fuse to several hundred dollars for motor or module replacement. | |
| Common Vehicles | This code is found across various makes and models equipped with memory seat systems, including but not limited to Ford, GM, Chrysler, Toyota, Honda, and European brands. | |
| Safety Precautions | Disconnect the battery before working on electrical components. Be careful when working around moving seat components. Consult the vehicle's repair manual for specific safety instructions. | |
| Advanced Diagnostics | Using an oscilloscope to analyze motor current waveforms can help pinpoint specific motor winding issues. Data logging MSM parameters during seat operation can reveal intermittent faults. | |
| Mechanical Binding Check | Manually inspect the seat tracks and mechanisms for any obstructions or debris. Try to manually move the seat components to check for binding. Lubricate seat tracks with appropriate grease. | |
| MSM Programming | In some cases, replacing the MSM requires programming or configuration to match the vehicle's specific settings. Refer to the vehicle's service manual for programming procedures. | |
| Fuse Location | Refer to the vehicle's owner's manual or repair manual for the specific location of the fuses related to the memory seat system. Typical locations include the under-dash fuse box and the engine compartment fuse box. |
Detailed Explanations
Definition: The B1336 DTC indicates the Memory Seat Module (MSM) has detected a current draw exceeding the specified threshold of 81 amps. This high current draw suggests a fault in the system, potentially causing damage or malfunction.
Symptoms: Several symptoms can accompany the B1336 DTC. These include a non-functional or intermittently working memory seat, slow or erratic seat movement, blown fuses related to the seat system, unusual battery drain, the seat failing to move at all, clicking noises emanating from beneath the seat, and the illumination of warning lights on the dashboard. These symptoms can vary depending on the severity and nature of the underlying problem.
Diagnostic Steps: A systematic approach is essential for diagnosing the B1336 DTC. Start with a visual inspection of the wiring harness and connectors for any signs of damage or corrosion. Next, check the fuses related to the seat system. Use a multimeter to verify the power and ground connections to the MSM. A scan tool can be used to monitor data from the MSM and other related modules. Testing the seat motors individually can help identify a faulty motor. Finally, if all other components check out, the MSM itself may need to be replaced.
Affected Components: The B1336 DTC can involve several components within the memory seat system. The Memory Seat Module (MSM) is the central control unit. Seat motors (fore/aft, up/down, tilt) are responsible for physically moving the seat. The wiring harness connects all the components. Fuses and circuit breakers protect the system from overcurrent.
Severity: The severity of the B1336 DTC ranges from moderate to high. While it might only cause inconvenience initially, a persistent overcurrent condition can lead to system failure, battery drain, and, in extreme cases, a potential fire hazard. Therefore, addressing this code promptly is crucial.
Related DTCs: Other DTCs may accompany B1336, providing further clues about the problem. These include codes related to individual seat motor circuits (e.g., B1335, B1337, B1338, B1339) and power supply issues to the MSM. Diagnosing these related codes can help narrow down the root cause.
Possible Solutions: The solution depends on the underlying cause of the overcurrent. Repairing or replacing damaged wiring is often necessary. Faulty seat motors should be replaced. A faulty MSM may also need replacement. Addressing any mechanical binding in the seat mechanism is crucial. Ensuring proper power and ground to the MSM is essential.
Tools Required: Diagnosing the B1336 DTC requires a few essential tools. A multimeter is needed to check voltage, continuity, and resistance. A scan tool is used to read DTCs and monitor system data. Wiring diagrams are invaluable for tracing circuits. Basic hand tools are necessary for accessing and disassembling components.
Estimated Repair Cost: The repair cost for the B1336 DTC can vary widely. A simple blown fuse replacement might only cost a few dollars. However, replacing a seat motor or the MSM can cost several hundred dollars, including parts and labor. The complexity of the diagnosis and the extent of the damage will influence the final cost.
Common Vehicles: The B1336 DTC is not specific to any particular make or model. It can occur in various vehicles equipped with memory seat systems, including Ford, GM, Chrysler, Toyota, Honda, and European brands. The specific design and implementation of the memory seat system may vary, but the underlying principles remain the same.
Safety Precautions: When working on electrical components, safety should always be a priority. Disconnect the battery before starting any repairs. Be cautious when working around moving seat components to avoid injury. Consult the vehicle's repair manual for specific safety instructions and torque specifications.
Advanced Diagnostics: For more complex cases, advanced diagnostic techniques may be necessary. Using an oscilloscope to analyze motor current waveforms can help pinpoint specific motor winding issues. Data logging MSM parameters during seat operation can reveal intermittent faults that are difficult to detect with static testing.
Mechanical Binding Check: A critical step is to thoroughly inspect the seat tracks and mechanisms for any obstructions or debris, such as coins, pens, or other foreign objects. Manually attempt to move the seat components to identify any binding or resistance. Lubricating the seat tracks with an appropriate grease can often resolve minor binding issues.
MSM Programming: In some vehicles, replacing the MSM requires programming or configuration to match the vehicle's specific settings. This programming ensures that the new module communicates correctly with other vehicle systems. Refer to the vehicle's service manual for the correct programming procedures.
Fuse Location: The location of the fuses related to the memory seat system can vary depending on the vehicle. Consult the vehicle's owner's manual or repair manual for the specific location. Typical locations include the under-dash fuse box and the engine compartment fuse box.
Frequently Asked Questions
What does the B1336 code mean? It indicates the Memory Seat Module (MSM) is drawing excessive current, exceeding 81 amps, suggesting a fault within the seat system.
What are the most common causes of B1336? Common causes include a shorted seat motor, damaged wiring, or a faulty MSM.
Can I fix the B1336 code myself? If you have experience with automotive electrical systems, you can attempt to diagnose and repair the issue, but proper tools and knowledge are essential.
Is it safe to drive with the B1336 code present? Driving with a B1336 code present could lead to further damage or a battery drain, so it's best to address the issue as soon as possible.
How much does it cost to fix a B1336 code? The cost varies depending on the cause, ranging from a few dollars for a fuse to several hundred dollars for a motor or module replacement.
Conclusion
The B1336 DTC signifies a potentially serious problem within the memory seat system. Proper diagnosis and repair are essential to restore functionality and prevent further damage. A systematic approach, starting with basic checks and progressing to more advanced diagnostics, is crucial for resolving this issue effectively.