B1535 — Memory 2 Switch Circuit Failure

OBD2 code B1535 flags a problem with the body electrical system (memory 2 switch circuit failure). The car is usually drivable while you plan the repair. Common culprits: corroded or loose connectors, blown fuse or failed relay, damaged wiring in door jambs or wet areas.

body electrical

Is it safe to drive?

Short-term driving is OK Usually safe to drive — body codes rarely affect drivability. Exceptions: exterior lighting and wipers in bad weather, and central locking faults that can leave the car unsecured.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm B1535 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many B0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the body electrical system for damage, corrosion, chafing or poor contact.
Subsystem check Operate the affected function while watching its switch and motor PIDs in live data.
Subsystem check Inspect connectors and wiring at flex points (door jambs, tailgate hinges) — wires break there first.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm B1535 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1535 (parts and labor, USD, independent shop rates): Replace the switch or actuator: $120–$450; Repair wiring or connectors: $80–$250; BCM repair or replacement: $300–$900. Overall, fixing B1535 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

How do I diagnose B1535 myself?

Start with a scan: confirm B1535, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the memory 2 switch circuit, and verify the suspect component against live data before buying parts.

What are the symptoms of B1535?

Drivers most often notice: warning light on the dashboard, no impact on engine operation in most cases, the affected function (locks, windows, lighting, wipers) works intermittently or not at all.

What does OBD2 code B1535 mean?

Is it safe to drive with B1535?

Usually safe to drive — body codes rarely affect drivability. Exceptions: exterior lighting and wipers in bad weather, and central locking faults that can leave the car unsecured.

How much does it cost to fix B1535?

Replace the switch or actuator — $120–$450; Repair wiring or connectors — $80–$250; BCM repair or replacement — $300–$900. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

OBD2 code B1535 points to a problem within the body control electronics of your vehicle. Specifically, it indicates that a circuit responsible for a memory 2 switch has failed. When the powertrain or body control module detects that a switch signal is outside its expected range — or fails to respond at all — it logs this code after running the check multiple times to rule out a temporary glitch.

Modern vehicles rely on the body control module to oversee switches and actuators distributed throughout the car — window controls, door locks, lighting circuits, and wiper motors, among others. When one of these components stops communicating properly with the module, the system records B1535 and saves a freeze frame snapshot capturing engine rpm, load, coolant temperature, and vehicle speed at the exact moment the fault occurred. That snapshot becomes your starting point for diagnosis.

Common Symptoms of B1535

Dashboard warning light illuminates
Engine performance remains unaffected in most cases
Affected function operates intermittently or fails completely
Door locks, windows, interior or exterior lighting, or wiper motors may be impacted

What Causes B1535?

Corroded or loose electrical connectors
Wiring damage in door jambs or areas exposed to moisture
Blown fuse or failed relay
Defective switch, motor, or actuator
Faulty body control module

How to Diagnose B1535

Hook up an OBD2 scanner and confirm B1535 is stored. Save the freeze frame data — it tells you the engine conditions when the module first spotted the problem.
Check for related diagnostic trouble codes. These often point to the underlying cause. Review manufacturer TSBs for your make and model — some body-related codes have factory updates or known fixes documented.
Inspect the wiring harness and connectors tied to the body electrical system. Look for chafing, broken strands, corrosion buildup, or connectors that are not fully seated.
Activate the suspect function and monitor its switch and motor PIDs in the live data stream. Watch for dropped signals or erratic behavior.
Pay close attention to flex points — door hinges, tailgate areas, and anywhere wiring bends repeatedly. Wires fatigue and break at these locations first.
Clear the code, then drive through a complete drive cycle that reproduces the freeze frame conditions. Rescan to confirm B1535 does not return.

Repair Options for B1535

Begin with the least expensive and most probable solutions before considering component replacement:

Switch or actuator replacement: $120–$450
Wiring harness or connector repair: $80–$250
Body control module repair or replacement: $300–$900

How Much Does Fixing B1535 Cost?

The final bill hinges entirely on which part triggered the code. Here is what to expect for parts and labor at an independent shop in USD:

Switch or actuator: $120–$450
Wiring or connector work: $80–$250
BCM service: $300–$900

Across all scenarios, most B1535 repairs fall between $80 and $900. Pinpointing the exact cause before purchasing parts prevents unnecessary spending — the body control module replacement, the priciest fix, is rarely the starting point.

Can You Drive with B1535?

B1535 is generally safe to drive. Body electrical faults typically do not compromise engine operation, braking, or steering. That said, exercise judgment depending on which system is affected. Failure of exterior lighting, wiper motors in rain or snow, or central locking can create safety concerns and should be addressed promptly.