B1723
Seat Driver Rearward Switch Circuit Short To Battery
Body Chassis/Safety Seat Electrical 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The seat's rearward adjustment switch is sending a constant "battery power" signal to the ECU instead of the normal on/off pattern, like a light switch that's stuck in the ON position. This electrical short tricks the computer into thinking the seat control is always active.

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Symptoms You May Notice
3 known symptoms for this code
Seat adjustment warning light or message on dashboard
Driver seat rearward control inoperative or stuck
Potential seat motor running continuously or erratically
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the rearward seat switch circuit for voltage transitions between ground and a reference voltage. When functioning normally, the switch toggles between states. A short to battery locks the voltage high, preventing the ECU from detecting normal switch closure events.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Rearward Switch Voltage 0-5V toggling between states Stuck at battery voltage (12V+) continuously
Switch Signal Pattern Intermittent transitions No voltage drop or state change detected
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Seat rearward switch connector
Disconnect and inspect the switch connector for corrosion, moisture, or pushed-back pins causing internal short to power.
2
Seat rearward switch assembly
Replace the defective switch if connector inspection shows no damage; internal short within switch is most common cause.
3
Seat control wiring harness
Inspect wiring between switch and seat control module for damaged insulation or contact with battery voltage source.