B1597 — Driver’s Seat Seatback Autoglide Forward Switch Circuit Short to Ground #

Note: The label for DTC B1597 may differ between manufacturers. Always refer to your OEM (Original Equipment Manufacturer) service documentation for precise terminology.

• “Driver’s Seat Seatback Autoglide Forward Switch Circuit Short to Ground” (Generic/OEM Ford)
• “Driver Power Seat Forward Switch Circuit Low” (Toyota/Lexus)
• “Seatback Autoglide Switch Circuit Low Input” (Nissan/Infiniti)

Summary of Code B1597 #

The B1597 diagnostic trouble code (DTC) indicates that the vehicle’s control module has detected a short to ground in the circuit for the driver’s seat seatback autoglide forward switch. This switch is part of the seat’s power adjustment system, specifically controlling the automatic forward movement of the seatback. When a short to ground is present, the module receives an abnormal low voltage reading, which can disrupt seat adjustment functionality. This code is most commonly found on vehicles with advanced power seat systems, often with memory or autoglide features. Addressing this issue promptly is important to maintain driver comfort and ensure all seat adjustments work as intended.

Common Symptoms for Code B1597 #

A short to ground in the driver’s seat autoglide forward switch circuit may not always trigger obvious issues, especially if the seat is rarely adjusted. However, most drivers will notice at least one of the following symptoms:

• Driver’s seatback won’t move forward automatically when using memory or autoglide functions
• Manual seatback adjustment may be disabled or intermittent
• Unusual clicking or relay sounds from under the seat
• Power seat memory positions not recalled properly
• Warning light or message on the dashboard (if equipped)

Probable Causes for Code B1597 #

The root cause of a short to ground in the autoglide switch circuit can vary, but some sources are more common than others. Below is a prioritized list based on frequency observed by technicians:

1. Damaged wiring harness under the driver’s seat (most common, due to seat movement)
2. Faulty seatback autoglide forward switch (internal short)
3. Corroded or loose electrical connectors at the seat switch or control module
4. Shorted seat control module (rare, but possible if water intrusion or previous repairs)
5. Pinched wires from improper seat installation or after-market modifications

Step-by-Step Diagnostic for Code B1597 #

To efficiently diagnose B1597, follow this structured approach. Always disconnect the battery and follow OEM safety precautions before working with seat wiring or modules.

• 1. Visual Inspection: Slide the seat fully back and inspect the wiring harness beneath and around the seat for obvious damage, pinching, or wear.
• 2. Check Seatback Switch: Test the autoglide forward switch for continuity and shorts with a multimeter. Compare readings to OEM specifications.
• 3. Inspect Connectors: Unplug connectors at the seat switch and control module. Look for corrosion, bent pins, or moisture.
• 4. Wiggle Test: With the ignition on, gently move the harness and connectors while monitoring the DTC with a scan tool. If the code clears or returns, suspect an intermittent wiring issue.
• 5. Test for Ground: With the harness disconnected, check for continuity between the switch circuit and ground. Any continuity indicates a shorted wire or component.
• 6. Check Control Module: If all wiring and switch tests pass, consider module diagnostics per OEM procedures.

Possible Repairs for Code B1597 #

The right repair depends on the diagnostic findings. Always use OEM-recommended components and techniques for best results.

• Repair or replace damaged wiring harness under the seat
• Replace the seatback autoglide forward switch if found faulty
• Clean and secure all connectors; apply dielectric grease if recommended
• Replace or reprogram the seat control module (only if confirmed defective)
• Re-route or shield wiring to prevent future pinching or abrasion

Is It Safe to Drive With Code B1597? #

Yes, but with limitations. Code B1597 does not affect critical driving functions such as steering, braking, or engine operation. However, the inability to adjust or properly position the driver’s seatback may reduce comfort and, in some cases, compromise safety in the event of a crash. If the seat is stuck in an unsafe or uncomfortable position, avoid driving until the issue is resolved.

Vehicles Most Commonly Affected by Code B1597 #

This code is most frequently reported on vehicles equipped with advanced driver’s seat adjustment systems—especially those from the late 2000s through the 2010s. OEMs with memory or autoglide seat features see this issue most:

• Ford (Explorer, Taurus, Edge, F-150)
• Toyota/Lexus (Camry, Avalon, ES350)
• Nissan/Infiniti (Altima, Maxima, Q50)
• Chrysler/Dodge (300, Charger)
• Honda/Acura (Accord, TLX with memory seats)

Common Mistakes & Best Practices for Code B1597 #

Technicians and DIYers sometimes make avoidable errors when tackling B1597. Build your repair confidence by avoiding these pitfalls:

• Assuming the switch is always the problem—wiring issues are more common
• Overlooking intermittent faults caused by seat movement
• Neglecting to disconnect the battery before repairs, risking airbag deployment
• Failing to inspect connectors for subtle corrosion or water damage
• Skipping OEM wiring diagrams—always reference the factory service manual

Quick FAQ for Code B1597 #

Still have questions? Here are answers to the most common B1597 concerns:

• Q: Will clearing the code fix my seat adjustment?
  A: No. Clearing the code will temporarily erase it, but if the root cause remains (such as a shorted wire), the issue—and the code—will return.
• Q: Can I replace the switch myself?
  A: If you’re comfortable removing the seat and handling connectors, yes. Just ensure you disconnect the battery first and follow OEM procedures to avoid airbag or electrical hazards.