B1715
Seat Driver Front Down Switch Circuit Short To Battery
Body Chassis/Safety Seat Control 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The driver's seat down switch is shorted to battery voltage, preventing the seat from moving down properly. It's like a stuck light switch that's permanently held in the "on" position by an electrical short.

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Symptoms You May Notice
3 known symptoms for this code
Seat down button is unresponsive or inoperative
Seat moves down on its own without user input
Warning light or message displayed on instrument cluster
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the voltage signal from the driver seat down switch circuit. Normally, the switch toggles between ground (0V) and open state. A short to battery causes the signal to remain at battery voltage (12-14V) continuously, preventing the ECU from detecting switch activation.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Switch Signal Voltage 0V when pressed, >10V when released Stuck at 12-14V (battery voltage) regardless of switch position
Circuit Resistance >100 kΩ open, <50Ω when activated <10Ω short to battery rail
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness connector
Disconnect and inspect the seat switch connector for corrosion, damaged pins, or moisture; clean contacts with electrical contact cleaner.
2
Driver seat down switch assembly
Replace the faulty switch unit if connector inspection reveals no damage; the internal contacts are likely shorted to the power rail.
3
Seat control module or wiring loom
Have a dealer diagnose the wiring harness for internal shorts between the switch circuit and battery rail if switch replacement fails.