B1711
Seat Driver Front Up Switch Circuit Short To Battery
Body Chassis/Safety Seat Controls 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The driver's seat up switch circuit is stuck at maximum voltage (shorted to battery power), making the ECU think the button is always being pressed. It's like a light switch that's permanently wired to power instead of being able to toggle on and off.

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Symptoms You May Notice
3 known symptoms for this code
Seat lumbar support moves up uncontrollably or gets stuck in up position
Seat adjustment controls become unresponsive or erratic
Warning light or seat malfunction indicator illuminates on dashboard
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the voltage level of the driver seat up switch circuit. Normally, the switch toggles between ground (0V) when pressed and a floating state when released. When shorted to battery, the ECU detects constant high voltage (12V+) instead of the expected cycling pattern, triggering the fault code.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Switch Circuit Voltage 0V when pressed, floating/open when released Constant 12V+ (shorted to battery)
Circuit Continuity Intermittent signal based on switch activation Persistent high voltage without switch engagement
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness connector
Inspect and reseat the seat switch connector at the seat base to eliminate loose or corroded connections causing false battery shorts.
2
Driver seat up switch
Replace the faulty up switch module if connector inspection reveals no issues; switches can fail internally and ground to battery voltage.
3
Seat wiring harness
Check for damaged insulation or pinched wires in the seat harness that may be contacting battery voltage; repair or replace damaged sections.