B1726 — Seat Driver Rear Up Switch Circuit Open #

The code description may vary depending on the vehicle manufacturer (OEM). Below you’ll find known label variations by automaker:

• Ford: Seat Driver Rear Up Switch Circuit Open
• GM: Seat Driver Rear Up Switch Circuit Open
• Toyota: Driver’s Seat Rear Up Switch Circuit Malfunction (Open)
• Honda: Power Seat Height Adjustment Switch Open Circuit (Driver, Rear)
• Hyundai/Kia: Driver Seat Rear Height Switch Open Circuit

Summary of Code B1726 #

The B1726 diagnostic trouble code (DTC) indicates an open circuit in the driver seat rear up switch—a component that controls the rearward tilt or height adjustment of the driver’s seat. When the vehicle’s Body Control Module (BCM) or seat control module detects that the electrical circuit to this switch is interrupted, it stores this code and may disable power seat movement in the affected direction.

This code is considered a body electronics fault and does not impact engine performance. However, it can cause inconvenience and, in rare cases, safety concerns if seat adjustment is necessary for proper driving posture. B1726 is most often triggered by wiring or switch issues, but sometimes module faults are to blame.

Frequent Symptoms for Code B1726 #

Think of your seat adjustment like the controls of your favorite recliner: when something’s not wired right, comfort is out the window. Here’s what drivers and technicians typically notice:

• Driver’s seat rear height/tilt adjustment inoperative in one or both directions (up/down).
• No sound or motor activity when pressing the rear height switch.
• Intermittent function of the rear seat tilt before complete failure.
• Seat may be stuck in an awkward or previously set position.
• No warning lights usually, but the code appears on a scan tool.

Probable Causes for Code B1726 #

Like a chain with a broken link, this code usually points to an interruption in the electrical pathway. Here are the most common culprits, listed in order of likelihood:

1. Faulty driver seat rear up switch (mechanical or internal electrical failure).
2. Damaged or disconnected wiring/connectors in the seat adjustment circuit (especially under the seat).
3. Loose or corroded connector terminals at the switch or seat control module.
4. Failed seat control module (rare).
5. Blown fuse (if the circuit’s protection is shared with other seat functions).

Step-by-Step Diagnostic Process for Code B1726 #

Diagnosing body electrical codes is a bit like detective work—methodical and thorough. Here’s a proven workflow to pin down the cause:

• 1. Confirm the code. Use a professional scan tool to verify B1726 is active or stored, and clear any history codes to see if it returns.
• 2. Inspect seat switch operation. Try adjusting the driver seat up/down at the rear. Listen for motor noise or any movement.
• 3. Check visible wiring and connectors. With the ignition off, inspect wiring under and around the seat for pinches, cuts, or loose connectors (especially after moving the seat fully forward/backward).
• 4. Test switch continuity. Disconnect the seat switch and use a multimeter to check for continuity when the rear up/down switch is pressed.
• 5. Check for power and ground. At the switch connector, verify that proper voltage and ground are present with a test light or voltmeter.
• 6. Inspect seat control module (if equipped). Check for signs of water damage, corrosion, or loose connectors.
• 7. Test circuit integrity. If all else checks out, back-probe the circuit from the module to the switch to rule out hidden breaks.

Possible Repairs for Code B1726 #

Once you’ve tracked down the culprit, repairs are usually straightforward. Here’s what typically resolves B1726:

• Replace the driver seat rear up switch if it fails continuity testing or is physically broken.
• Repair or replace damaged wiring under or near the seat (solder and insulate any cuts or pinches).
• Clean, tighten, or replace corroded connectors at the seat switch or module (apply electrical contact cleaner if needed).
• Replace the seat control module if all other components test good and the module itself is unresponsive.
• Replace a blown fuse (if one is identified), and check for underlying causes of the overcurrent.

Is It Safe to Drive With Code B1726? #

Yes, you can continue to drive with code B1726 active. This code does not affect essential vehicle operation, safety systems, or engine performance. However, the driver seat’s rear tilt/height function will be inoperative, which can compromise comfort or—if the seat is stuck in an unsuitable position—driver visibility and control. If you’re unable to achieve a safe driving posture, address the repair before regular use.

Vehicles Most Commonly Affected by Code B1726 #

B1726 is most often reported on vehicles equipped with power-adjustable seats, particularly from these brands:

• Ford (F-150, Fusion, Explorer, Escape)
• General Motors (Chevrolet Silverado, GMC Sierra, Cadillac models)
• Toyota (Camry, Avalon, Highlander)
• Honda (Accord, Odyssey, Pilot)
• Hyundai/Kia (Sonata, Santa Fe, Sorento)
• Lexus and Acura models with memory seats

Common Mistakes & Best Practices for Code B1726 #

Even seasoned techs can fall into traps with body electrical issues. Here’s how to avoid the most frequent missteps:

• Assuming the switch is bad without testing—always check wiring and connectors first, as these are often the true source.
• Overlooking intermittent faults—move the seat and harness to replicate the issue and catch chafed wires.
• Replacing fuses repeatedly—if a fuse blows, find and fix the root cause, don’t just swap fuses.
• Using generic scan tools—OEM-level diagnostics provide more accurate data and can run active tests.
• Neglecting to clear codes after repairs—verify the repair by clearing and rechecking for code return.

Quick FAQ for Code B1726 #

Here are fast answers to common questions about this DTC:

• Q: Can I manually adjust my seat if B1726 is set?
  A: No, if your seat uses only electric motors for the rear tilt function, you won’t be able to adjust it until the circuit is restored.
• Q: Will this code trigger a warning light?
  A: Usually not. Most vehicles do not illuminate a dashboard warning for seat adjustment faults, but the code will be stored and retrievable with a scan tool.
• Q: Is this an expensive repair?
  A: Often, no. Many fixes involve reconnecting a wire or changing a switch. Module replacement is rare and more costly.