Driver Seat Front Down Switch Circuit Open
The B1714 code indicates an open circuit in the driver's seat front down switch circuit, commonly found in Toyota/Lexus vehicles. This means the Seat ECU is not receiving the expected signal from the switch that controls the downward tilt of the front portion of the driver's seat. The system uses momentary switches that ground a circuit to signal the desired movement direction. An open circuit prevents this signal from reaching the module, disabling the front down function while other seat adjustments may still work.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or worn driver seat tilt switch
- Open or broken wiring between the switch and Seat ECU
- Corroded, loose, or disconnected switch connector
- High resistance or open ground pin in the switch circuit
- Internal Seat ECU failure (less common)
3. Symptoms You Will Notice
- Driver seat front tilt down function inoperative
- Other seat adjustments may function normally
4. Step-by-Step Diagnosis
Check for technical service bulletins (TSBs) related to the seat switch or wiring.
Inspect the driver seat front down switch and its connector for damage, corrosion, or loose pins.
Test the switch continuity: with the switch pressed, there should be continuity to ground.
Check wiring between the switch and Seat ECU for opens or shorts using a multimeter.
If wiring and switch are good, test the Seat ECU input signal; if missing, consider ECU replacement.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is safe to drive. The issue only affects the driver's seat front tilt down function, which is a comfort feature and does not impact vehicle safety.
How much does it cost to fix?▼
Repair costs typically range from $50 to $200 for switch replacement, or $100 to $400 if wiring repair is needed. ECU replacement can cost $500 or more.