B1759 — Seat Driver Rear Down Circuit Short To Battery #

The wording of this fault code may differ depending on the vehicle manufacturer. Always refer to your OEM documentation for the most accurate description.

• Seat Driver Rear Down Circuit Short To Battery (General/OEM generic)
• Seat Height Adjustment Rear Down Switch Circuit High (Ford)
• Driver Seat Rear Down Position Sensor Shorted to Battery (Toyota/Lexus)
• Power Seat Motor Rear Down Circuit High Input (Honda/Acura)

Summary of Code B1759 #

B1759 is a diagnostic trouble code (DTC) related to the power seat system, specifically the driver’s seat rear down adjustment circuit. This code means the vehicle’s onboard diagnostic system (OBD-II/EOBD) has detected a short-to-battery condition—essentially, excessive voltage—within the circuit that controls lowering the rear portion of the driver’s seat. This could stem from a wiring issue, a faulty switch, or a malfunctioning seat adjustment motor. The result may be erratic seat movement or loss of adjustability in the rear-down direction. Prompt attention is advised to prevent further electrical issues or loss of comfort features.

Common Symptoms for Code B1759 #

When B1759 is triggered, several tell-tale signs may appear. Some are obvious in daily use, while others may only be noticed during closer inspection or diagnostic scanning. Typically, the most obvious symptom is that the driver’s seat fails to lower at the rear as expected, but more subtle electrical irregularities can also emerge.

• Driver seat rear-down adjustment does not respond
• Erratic or intermittent seat movement
• Seat may move in other directions but not rear-down
• Power seat memory function fails to recall correct position
• Blown fuse (in some cases)
• Illumination of airbag/SRS or seat warning lights (on certain models)

Probable Causes for Code B1759 #

Determining the cause of B1759 requires a close look at the seat’s electrical system. Most commonly, an electrical short is at fault—but the root of that short can vary. Here are the most frequent culprits, in order of likelihood:

1. Damaged or pinched seat wiring harness (especially where the harness flexes beneath the seat)
2. Shorted seat adjustment switch (internal failure or moisture intrusion)
3. Defective rear-down seat motor (internal short to battery voltage)
4. Corroded or loose seat connectors (can cause voltage to leak or spike)
5. Incorrectly installed aftermarket equipment (such as seat covers with heating elements)
6. Faulty seat control module (rare, but possible)

Step-by-Step Diagnosis for Code B1759 #

Diagnosing a B1759 code involves isolating the source of excessive voltage in the rear-down circuit. Here’s a logical approach:

• 1. Verify the code with a scan tool—clear it and see if it returns after attempting to use the rear-down seat function.
• 2. Visually inspect all seat wiring, especially under the seat tracks for pinched or frayed wires.
• 3. Check seat adjustment switch for signs of liquid damage, corrosion, or physical sticking.
• 4. Test the seat motor by applying direct battery voltage and ground (OEM procedure) to see if it operates smoothly or draws excessive current.
• 5. Measure voltage at the rear-down circuit using a multimeter—look for voltage present when the switch is not activated (should be near zero).
• 6. Inspect connectors for loose pins, corrosion, or melting. Clean and re-seat as needed.
• 7. Check for aftermarket equipment that could be interfering with seat circuits.
• 8. If all else checks out, suspect the seat control module (consult OEM testing procedures before replacement).

Possible Repairs for Code B1759 #

Depending on the cause, resolving B1759 could be straightforward or require more involved work. Addressing the root issue is essential for both safety and comfort. Typical repairs include:

• Repairing or replacing damaged seat wiring harnesses
• Replacing the rear-down seat adjustment switch
• Replacing a faulty rear-down seat motor
• Cleaning or replacing corroded connectors
• Removing or properly integrating aftermarket accessories interfering with seat wiring
• Replacing the seat control module (only after other causes are ruled out)

Is It Safe to Drive With Code B1759? #

Yes, but with limitations. Code B1759 generally does not pose an immediate safety risk; it will not affect essential vehicle functions like braking or steering. However, loss of seat adjustment can compromise driving comfort and, in some cases, proper seat position for airbag deployment. If you share your vehicle or require specific seat positioning for medical reasons, have the issue resolved promptly. Prolonged driving without repair could also lead to further electrical faults.

Vehicles Most Commonly Affected by Code B1759 #

While B1759 is a generic code, it is most frequently reported in vehicles equipped with power-adjustable driver seats. These include, but are not limited to:

• Toyota Camry, Lexus ES/GS series
• Honda Accord, Acura TL/MDX
• Ford Explorer, Ford F-150 (higher trims)
• Nissan Altima, Infiniti G series
• Chevrolet Tahoe, GMC Yukon

Common Mistakes & Best Practices for Code B1759 #

Diagnosing and repairing B1759 can be deceptively simple or unexpectedly tricky. Avoiding pitfalls and following some golden rules will save time and frustration:

• Assuming the seat switch is always the culprit—wiring is often at fault.
• Failing to check for pinched wires after seat removal or reinstallation.
• Overlooking aftermarket seat heaters or accessories as a source of interference.
• Replacing expensive modules before performing basic electrical checks.
• Neglecting to clear codes after repair and verify restoration of function.

Quick FAQ for Code B1759 #

Still have questions? Here are quick answers to common concerns:

• Q: Will this code drain my battery?
  A: Not typically, but if the short is severe, it could cause a parasitic drain or blow a fuse—so prompt repair is wise.
• Q: Can I just disconnect the seat motor to clear the code?
  A: Disconnecting may stop the symptom, but the code will likely return. Fixing the underlying fault is necessary for permanent resolution.