B1722
Seat Driver Rearward Switch Circuit Open
Body Chassis/Safety Seat Positioning 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The driver's seat rearward switch circuit has an open connection, meaning the electrical signal cannot flow properly. It's like a broken wire in a light switch that prevents the circuit from completing.

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Symptoms You May Notice
3 known symptoms for this code
Seat position memory not functioning for rearward adjustment
Warning light or message related to seat controls on dashboard
Driver seat rearward motor unresponsive or inoperative
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors voltage continuity through the driver seat rearward switch circuit. It expects a closed switch to provide a specific voltage signal when the seat adjustment button is pressed. An open circuit results in no signal or an unexpected high-resistance reading that triggers the fault code.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Switch Circuit Voltage 0-12V closed loop signal present Open circuit / No signal detected
Circuit Resistance Less than 10 ohms when closed Greater than 10 ohms or infinite resistance
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Electrical connector at seat switch
Disconnect and reconnect the seat motor/switch connector to reseat any corroded or loose pins.
2
Wiring harness between seat and body control module
Inspect the entire harness for cuts, pinches, or exposed wires and repair or replace damaged sections.
3
Rearward seat switch assembly
Replace the switch unit if continuity testing shows no signal despite clean connections.