OBD Code B1725: Seat Driver Rear Up Switch Circuit Failure

Q: What does OBD code B1725 mean?

Seat Driver Rear Up Switch Circuit Failure. The driver's rear seat up/down switch isn't communicating properly with the seat control module, like a light switch that's physically broken or has a loose wire. The system can't detect when you're trying to adjust the rear seat position.

Q: How do I fix OBD fault code B1725?

Inspect and reseat the switch connector at the seat base, cleaning any corrosion from the terminals with electrical contact cleaner.. Replace the switch itself if connector cleaning doesn't restore function, as internal contacts often fail.. Check for pinched, damaged, or corroded wiring between the switch and the seat control module under the seat.

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What This Actually Means

In plain language — no jargon

The driver's rear seat up/down switch isn't communicating properly with the seat control module, like a light switch that's physically broken or has a loose wire. The system can't detect when you're trying to adjust the rear seat position.

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Symptoms You May Notice

3 known symptoms for this code

Rear seat up/down buttons don't function or respond intermittently

Seat control warning light appears on dashboard

No audible motor response when pressing the adjustment switch

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Embedded Systems Insight

What the ECU/ECM is actually computing

The seat control module monitors voltage signals from the driver's rear seat up switch when pressed. It expects a clean digital signal transitioning between ground and supply voltage within normal timing parameters. A fault is logged when the signal is missing, shorted, or fails continuity testing.

Voltage & Parameter Thresholds

Parameter	Normal Range	Fault Condition
Switch Signal Voltage	0V (open) to 12V (closed) with clean transitions	No voltage change, stuck voltage, or intermittent dropouts
Circuit Resistance	<5 ohms when closed, >100k ohms when open	>50 ohms closed or <50k ohms open (high resistance/short)

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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex

1

Seat switch connector and wiring harness

Inspect and reseat the switch connector at the seat base, cleaning any corrosion from the terminals with electrical contact cleaner.

2

Driver rear seat up switch

Replace the switch itself if connector cleaning doesn't restore function, as internal contacts often fail.

3

Seat control module wiring harness

Check for pinched, damaged, or corroded wiring between the switch and the seat control module under the seat.