B1726
Seat Driver Rear Up Switch Circuit Open
Body Chassis/Safety Seat Control Circuit 🟢 Low — Fix at next service
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What This Actually Means
In plain language — no jargon

The driver's rear seat up switch circuit has an open connection, meaning the electrical signal can't reach the control module. It's like a broken phone line preventing communication between the seat switch and the car's brain.

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Symptoms You May Notice
3 known symptoms for this code
Seat adjustment buttons for rear up function don't work
No response when pressing driver rear seat up control
Dashboard warning light or seat malfunction indicator illuminated
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Embedded Systems Insight
What the ECU/ECM is actually computing

The body control module monitors voltage and continuity on the driver rear seat up switch circuit. It expects a defined voltage drop when the switch is pressed and continuity in the circuit path. An open circuit prevents any signal from reaching the ECU, triggering the fault code.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Circuit Continuity 0-100 ohms (closed switch); continuous path to ECU Open circuit; infinite ohms or no signal detected
Signal Voltage 5V reference, variable drop on switch closure No voltage change; remains at reference or ground
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Seat wiring harness connector
Inspect and reseat the connector at the seat base or module to restore contact.
2
Switch wiring and connections
Check for corroded or loose terminals in the up switch circuit and clean or reconnect as needed.
3
Driver rear seat up switch assembly
Replace the switch if internal contacts are damaged or permanently open.