B1536 — Memory 2 Switch Circuit Open #

Note: The wording of this DTC may vary by vehicle manufacturer.

• B1536: Seat Memory 2 Switch Circuit Open (Ford, Lincoln, Mercury)
• B1536: Memory Position 2 Switch Open Circuit (GM/Chevrolet, Toyota)
• B1536: Memory 2 Set Switch Circuit Malfunction (Nissan)

Summary of DTC B1536 #

B1536 — Memory 2 Switch Circuit Open is a diagnostic trouble code (DTC) that indicates the vehicle’s onboard computer, also known as the ECU (Engine Control Unit) or BCM (Body Control Module), has detected an open circuit condition in the seat memory switch responsible for storing or recalling the second memory position. This system allows drivers to save and retrieve seat, mirror, and sometimes steering wheel positions at the touch of a button. When the circuit for the second memory switch is open, the system cannot properly recognize or activate the stored settings associated with memory position 2. This code does not directly affect engine performance, but it can impact driver comfort and convenience, and may indicate wiring or switch issues within the seat module.

Common Symptoms for Code B1536 #

When B1536 is stored, you may notice certain comfort features are unavailable or not working as expected. While this code won’t leave you stranded, these inconveniences can be a nuisance, especially in vehicles shared by multiple drivers.

• The seat memory function for position 2 does not respond
• Seat, mirror, or steering wheel do not adjust when pressing memory button 2
• No audible confirmation or indicator light when using memory 2
• Other memory functions (positions 1 or 3) may still operate normally
• In some cases, related error messages or warning lights on the dash

Probable Causes for Code B1536 (Ranked by Likelihood) #

Several underlying issues can cause an open circuit condition in the memory 2 switch circuit. The most common are related to the switch itself, wiring, or connectors. Less frequently, a fault may originate from the seat module or electronic control unit. Diagnosing the issue in order of probability will save both time and effort.

1. Faulty Memory 2 Switch — The button or switch is defective and not making electrical contact.
2. Damaged or Disconnected Wiring — Open, cut, or corroded wires between the switch and control module.
3. Loose or Corroded Connectors — Poor connections at the switch, seat module, or wiring harness plugs.
4. Seat Module (Memory Module) Malfunction — The internal circuitry of the module is faulty.
5. Software or Programming Fault — Rarely, a BCM or seat module software glitch can cause this code.

Step-by-Step Diagnostic for Code B1536 #

Diagnosing B1536 requires a logical, stepwise approach. Always start with the most accessible and likely causes, progressing to more complex or less common faults. Having a multimeter and the vehicle’s wiring diagram is strongly recommended for accurate troubleshooting.

• Verify the code with a scan tool and check for related codes.
• Test the operation of memory switch positions 1, 2, and (if present) 3 to isolate the fault to position 2.
• Inspect the memory 2 switch for physical damage, sticky movement, or missing parts.
• Remove and check the electrical connector at the memory switch for corrosion, bent pins, or loose fit.
• Using a multimeter, test continuity of the wires from the memory 2 switch to the seat/BCM module.
• Check for proper voltage supply and ground at the memory switch connector.
• If possible, substitute a known-good switch to test system response.
• Inspect the seat module for signs of water damage or electrical burning.
• Consult OEM service information for exact pinout and test procedures.

Possible Repairs for Code B1536 #

Once the root cause of the open circuit is found, repair or replacement is usually straightforward. Always clear the code and verify proper operation after any repair.

• Replace the faulty memory 2 switch if defective.
• Repair or replace damaged wiring in the memory switch circuit.
• Clean, tighten, or replace corroded connectors at the switch or module.
• Replace the seat memory module if it has failed internally.
• Re-flash or update the seat module/BCM software if an OEM bulletin applies.

Is It Safe to Drive With Code B1536? #

Yes, you can drive with this code present. B1536 does not affect vehicle safety, engine performance, or critical functions. However, it does impact the convenience of the memory seat function, which can be particularly inconvenient if multiple drivers use the vehicle. If you rely on memory seat features for accessibility or medical reasons, prompt repair is recommended.

Vehicles Most Commonly Affected by B1536 #

While B1536 can appear in any vehicle equipped with memory seat systems, it is most commonly reported in models from major manufacturers using similar seat memory architectures. This includes luxury and mid-range vehicles with multi-position seat memory.

• Ford (Explorer, F-150, Taurus, Lincoln MKZ, Navigator)
• General Motors (Chevrolet Tahoe, GMC Yukon, Cadillac CTS)
• Toyota (Avalon, Camry, Land Cruiser)
• Nissan (Maxima, Murano, Pathfinder)
• Honda/Acura (Accord, MDX, TLX)
• Chrysler/Jeep (300C, Grand Cherokee)
• Luxury brands: Lexus, Infiniti, Mercedes-Benz, BMW (various models)

Common Mistakes & Best Practices for Code B1536 #

Misdiagnosis is common with seat memory codes because of overlooked basics or making assumptions without testing. Adhering to best practices prevents unnecessary parts replacement and frustration.

• Mistake: Replacing the seat module before checking the switch and wiring.
• Mistake: Ignoring connector corrosion, especially in regions with high humidity or after water leaks.
• Best Practice: Always check for Technical Service Bulletins (TSBs) related to memory seat issues for your vehicle.
• Best Practice: Use the OEM wiring diagram to verify circuit integrity before replacing any components.
• Best Practice: Test all memory positions, as similar codes may indicate a broader wiring issue.

Quick FAQ for B1536 #

Here are concise answers to frequent questions about B1536:

• Q: Will clearing the code make the memory 2 switch work again?
  A: Clearing the code alone will not restore function if the underlying circuit issue is not resolved. The code will likely return.
• Q: Can a weak battery or low voltage cause this code?
  A: Rarely. While low voltage can cause odd electrical behaviors, B1536 specifically indicates an open circuit. Always check the switch and wiring first.