Introduction:
The B1535 diagnostic trouble code (DTC) indicates a fault within the Memory 2 switch circuit in a vehicle's power seat system. This system allows drivers to save and recall preferred seat positions. When this code appears, it signifies that the vehicle's computer, often the Body Control Module (BCM), has detected an issue with the electrical circuit responsible for storing and retrieving the second memory position. Addressing this issue promptly is crucial for restoring full functionality of the power seat's memory feature and ensuring driver comfort.
| Aspect | Description | Possible Causes |
|---|---|---|
| Definition of B1535 | Memory 2 Switch Circuit Failure; Indicates a malfunction in the electrical circuit associated with storing and recalling the second memory seat position. The BCM detects an open, short, or out-of-range signal from the memory 2 switch. This prevents the seat from correctly storing or recalling the desired position associated with Memory 2. | Faulty Memory 2 Switch: The switch itself is defective and not sending the correct signals. Wiring Issues: Damaged, corroded, or shorted wiring in the circuit. Connector Problems: Loose, corroded, or damaged connectors in the circuit. BCM Malfunction: In rare cases, the BCM itself is faulty, leading to misinterpretation of the switch signals. Open Circuit: A break in the wiring, preventing the signal from reaching the BCM. Short Circuit: The circuit is shorted to ground or another voltage source. |
| Symptoms | The most common symptom is the inability to store or recall the Memory 2 seat position. Other symptoms may include intermittent seat operation, erratic seat movement, or a warning light illuminated on the dashboard. The Memory 2 button might be unresponsive, or the seat might move to an incorrect position when the Memory 2 button is pressed. The driver may experience difficulty setting or saving the memory position. | Memory 2 Function Not Working: The primary symptom; seat will not save or recall position to Memory 2. Intermittent Seat Operation: Seat moves erratically or stops unexpectedly. Dashboard Warning Light: A general "Check Seat System" or similar light may be illuminated. Unresponsive Memory 2 Button: Pressing the Memory 2 button has no effect. * Incorrect Seat Position Recall: The seat moves to the wrong position when Memory 2 is selected. |
| Diagnostic Steps | The diagnostic process involves a systematic approach to identify the root cause of the B1535 code. It typically begins with verifying the code using a scan tool, followed by a visual inspection of the wiring and connectors. The memory 2 switch is then tested for proper function using a multimeter. If the switch is working correctly, the wiring harness is checked for continuity and shorts. Finally, the BCM may be tested as a last resort. | Scan Tool Verification: Confirm the presence of the B1535 code. Visual Inspection: Check wiring and connectors for damage, corrosion, or looseness. Memory 2 Switch Testing: Use a multimeter to test the switch's resistance and voltage output. Wiring Harness Testing: Check for continuity, shorts to ground, and shorts to voltage in the wiring. * BCM Testing (Advanced): Requires specialized equipment and expertise to test the BCM's functionality. |
| Common Tools Needed | Basic tools required for diagnosing and repairing the B1535 code include a scan tool, multimeter, wiring diagram, and basic hand tools (screwdrivers, pliers, wire strippers). A circuit tester can also be helpful for identifying shorts and open circuits. Depending on the severity of the issue, a soldering iron and heat shrink tubing may be necessary for repairing damaged wiring. Access to a vehicle-specific repair manual or online database is highly recommended. | Scan Tool: To read and clear diagnostic trouble codes. Multimeter: To test voltage, resistance, and continuity. Wiring Diagram: To understand the circuit layout and identify components. Basic Hand Tools: Screwdrivers, pliers, wire strippers, etc. * Circuit Tester: To identify shorts and open circuits. |
| Repair Procedures | Repair procedures vary depending on the identified cause. If the memory 2 switch is faulty, it will need to be replaced. Damaged wiring or connectors should be repaired or replaced as needed. If corrosion is present, the affected components should be cleaned or replaced. In rare cases, if the BCM is faulty, it may need to be reprogrammed or replaced. After any repairs, the DTC should be cleared and the system retested to ensure proper function. | Switch Replacement: Replace the faulty Memory 2 switch. Wiring Repair/Replacement: Repair or replace damaged wiring sections. Connector Repair/Replacement: Clean, repair, or replace corroded or damaged connectors. BCM Reprogramming/Replacement (Rare): Requires specialized equipment and expertise. * DTC Clearing and Re-testing: Clear the code and verify the system is functioning correctly after repairs. |
| Related DTCs | Other DTCs related to the power seat system may provide additional clues to the problem. These codes may include B1534 (Memory 1 Switch Circuit Failure), B1536 (Memory 3 Switch Circuit Failure), or codes related to the seat motor circuits. Diagnosing and addressing these related codes may be necessary to resolve the B1535 code completely. | B1534 - Memory 1 Switch Circuit Failure: Similar issue with Memory 1. B1536 - Memory 3 Switch Circuit Failure: Similar issue with Memory 3 (if applicable). Seat Motor Circuit Codes: Issues with the motors that move the seat. Power Seat System Codes: General codes related to the power seat system. |
Detailed Explanations
Definition of B1535: The B1535 code specifically points to a problem in the electrical circuit that is responsible for the Memory 2 function of your power seat. This means the car's computer isn't receiving the correct signals from the Memory 2 switch, preventing you from saving or recalling your preferred seat position using that setting. The BCM constantly monitors the voltage and resistance within this circuit, and when it detects a value outside of the acceptable range, it triggers the B1535 code.
Symptoms: The most obvious symptom is the inability to save or recall a seat position using the Memory 2 button. However, other issues can arise, such as the seat moving erratically or not moving at all, a warning light appearing on your dashboard related to the seat system, or the Memory 2 button simply not responding when pressed. Sometimes, the seat might even move to a completely different, incorrect position when you try to use Memory 2.
Diagnostic Steps: Diagnosing the B1535 code requires a methodical approach. First, you need to confirm the code using a scan tool. Then, visually inspect the wiring and connectors associated with the Memory 2 switch, looking for any signs of damage, corrosion, or looseness. Next, use a multimeter to test the switch itself, checking its resistance and voltage output. If the switch seems to be working, you'll need to test the wiring harness for continuity and shorts. Finally, if all else fails, the BCM may need to be tested, but this requires specialized equipment and expertise.
Common Tools Needed: To diagnose and repair the B1535 code, you'll need a few essential tools. A scan tool is necessary to read and clear diagnostic trouble codes. A multimeter is crucial for testing voltage, resistance, and continuity in the circuit. A wiring diagram will help you understand the circuit layout and identify the components involved. Basic hand tools like screwdrivers, pliers, and wire strippers are also necessary. A circuit tester can be useful for identifying shorts and open circuits.
Repair Procedures: The repair procedure will depend on what you find during the diagnostic process. If the Memory 2 switch is faulty, you'll need to replace it. If you find damaged wiring or connectors, you'll need to repair or replace them as well. Corrosion can be cleaned or the affected components replaced. In rare cases, if the BCM is the problem, it may need to be reprogrammed or replaced. After any repairs, always clear the DTC and retest the system to make sure it's working correctly.
Related DTCs: Other diagnostic trouble codes related to the power seat system can provide valuable context for understanding the B1535 code. For example, codes related to Memory 1 or Memory 3 switch failures (if applicable) might indicate a broader issue with the seat memory system. Similarly, codes related to the seat motor circuits could point to a problem with the seat's ability to move into the stored positions. Diagnosing and addressing these related codes may be necessary to fully resolve the B1535 code.
Frequently Asked Questions
What does the B1535 code mean? It indicates a problem with the electrical circuit for the Memory 2 switch in your power seat, preventing you from saving or recalling your preferred seat position using that setting. The BCM has detected an open, short, or out-of-range signal from the memory 2 switch.
How do I fix the B1535 code? Start by visually inspecting the wiring and connectors, then test the Memory 2 switch with a multimeter; repair or replace any faulty components. If the problem persists, further diagnosis, possibly involving BCM testing, is needed.
Can I drive with the B1535 code? Yes, you can typically drive with the B1535 code, but you won't be able to use the Memory 2 seat position feature. However, if the seat moves erratically, it could pose a safety risk.
Is the B1535 code expensive to fix? The cost to fix the B1535 code depends on the cause. Replacing a faulty switch is relatively inexpensive, but diagnosing and repairing wiring issues or replacing the BCM can be more costly.
What causes the B1535 code? Common causes include a faulty Memory 2 switch, damaged wiring, corroded connectors, or, in rare cases, a malfunctioning BCM. These issues disrupt the electrical signal between the switch and the BCM.
How do I clear the B1535 code? You can clear the B1535 code using a scan tool after you have repaired the underlying problem that caused the code to appear. Clearing the code without fixing the issue will only result in it returning.
Conclusion
The B1535 code indicates a problem within the Memory 2 switch circuit of your vehicle's power seat system. By systematically diagnosing the issue and addressing the root cause, you can restore the full functionality of your power seat's memory feature and ensure a comfortable driving experience. Remember to always prioritize safety and consult a qualified technician if you are unsure about any aspect of the diagnostic or repair process.