B1535 — Memory 2 Switch Circuit Failure #

The code description may vary depending on the vehicle manufacturer.

Known label variations for B1535:

• Memory 2 Switch Circuit Malfunction (Ford)
• Seat Memory Position 2 Switch Circuit Failure (GM/Chevrolet)
• Driver Seat Memory 2 Switch Circuit Open (Toyota/Lexus)
• Power Seat Memory Switch “2” Circuit Fault (Honda/Acura)

Summary of DTC B1535 #

B1535 is a diagnostic trouble code (DTC) related to the memory switch circuit for seat position 2. This code indicates that the circuit responsible for saving and recalling the second memory seat position has experienced a fault. The memory switch is often located on the side of the driver’s seat or door panel, allowing easy recall of preset seat positions. When the circuit fails, the system either cannot store or recall the memory setting for button “2.” Typically, this DTC is set by your vehicle’s Body Control Module (BCM) or a dedicated seat control module. While not a critical safety issue, it can affect comfort and convenience.

Common Symptoms for B1535 #

You may notice this code due to changes in your seat’s automatic adjustment behavior. The symptoms usually revolve around the inability to save or recall a specific seat memory position. In some cases, related warning lights or messages may appear on your dashboard or infotainment display.

• Memory seat position 2 not saving or recalling properly
• No response when pressing the memory “2” button
• Seat moves only with manual controls, not memory recall
• Intermittent function of seat memory features
• Message or alert: “Memory Function Unavailable” (varies by OEM)

Most Probable Causes for B1535 #

The root cause of a B1535 code can range from simple switch issues to wiring or module faults. Diagnosing these causes in order of likelihood helps you find the problem efficiently.

1. Faulty memory “2” switch (physical button or pad malfunction)
2. Wiring issues (broken, loose, or corroded wires/connectors in the switch circuit)
3. Defective seat control module or BCM not recognizing input
4. Blown fuse supplying the memory seat system
5. Water intrusion or liquid spills affecting switch or harness
6. Poor ground connection at seat or module location

Step-by-Step Diagnosis for B1535 #

A systematic diagnostic approach ensures you don’t overlook a basic cause. Always follow safety protocols—disconnect the battery if working with seat wiring to avoid accidental airbag deployment. Here’s a proven step-by-step process:

• 1. Retrieve and confirm the code with a professional OBD-II scan tool. Note any other related seat or BCM codes.
• 2. Visually inspect the memory 2 switch for obvious damage, wear, or contamination (coffee, soda, etc.).
• 3. Check the seat memory switch wiring and connectors for loose, broken, or corroded pins.
• 4. Test the memory 2 switch’s electrical function with a multimeter (verify continuity and resistance as specified in the OEM repair manual).
• 5. Inspect the seat control module or BCM for signs of water or electrical damage.
• 6. Verify all memory seat system fuses are intact. Replace any blown fuse and monitor for recurrence.
• 7. Clear the code and test memory seat operation. If the fault returns, further module or circuit testing may be needed.

Possible Repairs for B1535 #

Once you’ve pinpointed the cause, the repair may be straightforward or require specialized parts. Most repairs are within reach for a skilled DIYer or professional technician.

• Replace the faulty memory “2” switch if found defective.
• Repair or replace any damaged, corroded, or loose wiring/connectors in the memory switch circuit.
• Replace the seat control module if it fails to recognize correct switch input (after verifying circuit integrity).
• Replace or repair any blown fuses related to the memory seat system.
• Clean or dry any liquid contamination affecting switch or connectors.
• Tighten or clean ground connections at the seat/module as needed.

Is It Safe to Drive with B1535? #

Yes, you can continue driving with code B1535 active, as this issue does not affect your vehicle’s safety, braking, or drivability. However, the seat memory function for position 2 will not work correctly, which could be inconvenient if multiple drivers use memory presets. If you frequently switch drivers or rely on memory functions, prompt repair is recommended for comfort.

Vehicles Most Commonly Affected by B1535 #

B1535 is most often seen in vehicles equipped with power memory seats, especially in mid- and high-end trims. The following vehicles are commonly reported with this code (not exhaustive):

• Ford Explorer, Edge, and F-150 (2010–present)
• Chevrolet Tahoe, Suburban, Silverado (2015–present)
• Toyota Camry, Avalon, Highlander (2012–present with memory seats)
• Lexus RX, ES, and GS Series
• Honda Accord, Pilot, Odyssey (with memory seat options)
• GMC Yukon, Sierra (2015–present)
• Cadillac Escalade (all recent generations)

Common Mistakes & Best Practices for B1535 #

Misdiagnosis of B1535 is common, especially if troubleshooting is rushed. Avoid unnecessary part replacements and follow methodical diagnostic steps.

• Assuming the seat control module is bad without first checking switch and wiring integrity
• Overlooking simple wiring issues beneath the seat (where connectors can get kicked or pinched)
• Neglecting to check for fluid spills that may have caused switch contamination
• Forgetting to disconnect the battery before working on seat electronics (risk of airbag deployment)
• Not clearing the code after repairs and confirming that the issue is resolved by testing the memory function

Quick FAQ for B1535 #

Here are answers to the most common questions about DTC B1535:

Q: Will my seat memory still work for position 1 or other buttons?
A: Usually, yes. The fault typically only affects the “2” position. Other presets should work normally unless there’s a broader wiring or module issue.

Q: Can a dead battery or jump-start cause B1535?
A: Rarely. While voltage fluctuations can sometimes confuse electronic modules, B1535 most often points to an issue with the switch, wiring, or seat control module itself.

If you need to restore full memory seat functionality and comfort, follow the diagnosis steps above or consult a qualified technician for assistance.