B1248 — Passenger’s Seatback Autoglide Rearward Switch Circuit Short to Ground #

The code label may vary depending on the vehicle manufacturer.

• B1248 – Seatback Autoglide Rearward Switch Circuit Short to Ground (Toyota/Lexus)
• B1248 – Passenger Power Seatback Autoglide Switch Short (Nissan/Infiniti)
• B1248 – Seatback Adjust Switch Circuit Low (Ford/Lincoln/Mercury)

Summary of Code B1248 #

The B1248 Diagnostic Trouble Code (DTC) indicates that the vehicle’s onboard diagnostics system (OBD-II/EOBD) has detected a short to ground within the passenger seatback autoglide rearward switch circuit. In simple terms, this means the electrical circuit controlling the automatic rearward movement of the passenger seatback is experiencing an unintended connection to the vehicle’s ground. Such issues often affect the seat’s adjustability features, potentially leading to comfort or convenience concerns. Though not a direct safety risk, ignoring this code can result in inoperable seat functions and potential wiring damage over time. Prompt diagnosis and repair are recommended to restore full seat adjustment capability and prevent further complications.

Common Symptoms for Code B1248 #

When the B1248 code is present, you might notice one or more signs indicating trouble with the passenger seatback’s autoglide function. While not all symptoms may appear at once, any of these should prompt a closer look:

• Passenger seatback fails to recline or move rearward automatically
• Intermittent or non-functional seat adjustment switch for rearward movement
• Unusual clicking or buzzing sounds from the seat motor area
• “Seat malfunction” or similar warning displayed in the instrument cluster (in some models)
• Loss of memory seat features related to passenger seatback position

Probable Causes for Code B1248 #

The most common root causes of a B1248 code involve electrical faults or component failures in the autoglide seatback system. These causes are ranked by their typical frequency:

1. Damaged wiring or connectors in the seatback switch circuit (often due to seat movement or pinching)
2. Faulty passenger’s seatback autoglide switch (wear or internal shorting)
3. Seat motor or actuator malfunction causing excessive current draw
4. Corroded, loose, or shorted ground points under the seat
5. Blown fuse or relay (less common, but possible with repeated circuit shorting)
6. Faulty seat control module (rare, but possible in some OEM systems)

Step-by-Step Diagnostic Guide for Code B1248 #

Addressing a B1248 code effectively requires a systematic diagnostic approach. Here’s a proven step-by-step process:

• Confirm the code is present using a professional-grade OBD-II scanner, and check for related seat or body control module codes.
• Visually inspect the passenger seat wiring harness and connectors for signs of wear, pinching, or corrosion—especially beneath the seat tracks.
• Test the autoglide switch operation with a multimeter, checking for continuity and shorts to ground according to OEM wiring diagrams.
• Check the seat motor/actuator for signs of seizure or internal shorting—listen for abnormal noises or test current draw if accessible.
• Inspect the related fuse and relay in the fuse block; replace if blown, but investigate cause before replacing to avoid repeat failures.
• Examine ground points under the seat for looseness or rust; clean and retighten as necessary.
• If all above pass, consider testing/replacing the seat control module (if equipped and per OEM diagnostic flowchart).
• Clear the code and verify normal seat operation; if the code returns, re-examine each step for missed faults.

Possible Repairs for Code B1248 #

Repair options for a B1248 DTC depend on the specific root cause found during diagnosis. Typical repairs include:

• Repairing or replacing damaged wiring or connectors in the seatback switch circuit
• Replacing the passenger seatback autoglide switch assembly
• Repairing or replacing the seat motor/actuator if it draws excessive current or is shorted
• Cleaning and securing corroded or loose ground points
• Replacing blown fuses or faulty relays after correcting the underlying issue
• Replacing the seat control module if no other faults are found and OEM diagnostics confirm module failure

Is It Safe to Drive with Code B1248? #

Yes, you can generally drive with code B1248 present, but with limited seat adjustment functionality. This code does not affect core safety systems like brakes or airbags. However, the passenger seatback’s inability to adjust rearward may cause discomfort or inconvenience, especially for taller occupants. Prolonged use with a shorted circuit could further damage seat electronics or wiring, so timely repair is advised to avoid escalating costs.

Vehicles Most Affected by Code B1248 #

This code is most commonly reported on vehicles equipped with power passenger seats featuring autoglide or memory functions. Manufacturers with frequent occurrences include:

• Toyota and Lexus sedans and SUVs (Camry, ES, RX, Avalon, Highlander)
• Nissan and Infiniti models (Altima, Maxima, Murano, Q50, QX60)
• Ford and Lincoln luxury vehicles (Taurus, Continental, MKZ, Navigator)
• Some Honda/Acura and Hyundai/Genesis models with advanced seat features

Common Mistakes & Best Practices for Code B1248 #

When dealing with B1248, technicians and DIYers sometimes fall into avoidable traps. Here are frequent errors and smarter approaches:

• Replacing the seat switch or motor without checking wiring first—damaged wires are often the root cause.
• Overlooking ground points under the seat—always check for rust or looseness.
• Clearing the code without addressing the underlying short—this only delays a proper fix.
• Neglecting to consult OEM wiring diagrams—wire colors and pinouts can vary by year and trim.
• Using generic seat parts instead of OEM components—fit and function may not be guaranteed.

Quick FAQ for Code B1248 #

Still have questions? Here are quick answers to common concerns about B1248:

• Q: Will disconnecting the battery reset B1248?
  A: Disconnecting the battery may clear the code temporarily, but if the fault remains, B1248 will return as soon as the seat is used again.
• Q: Can a blown fuse alone trigger B1248?
  A: A blown fuse can be a symptom, but usually not the sole cause. The underlying short to ground must be repaired for a lasting fix.