Driver Seat Rear Up Switch Circuit Malfunction
The B1725 code indicates that the driver seat control module (SCM or DSM) has detected an electrical anomaly in the circuit for the switch that controls the upward movement of the rear seat section (backrest or rear base adjustment). In the comfort network architecture of these manufacturers, the module monitors continuity and voltage states of the switch; if the signal remains outside expected parameters—due to an open circuit, short to ground, or short to power—this manufacturer-specific DTC is set. The fault isolates the rear lift function, potentially disabling the electric adjustment of that section without affecting other vehicle systems.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged driver seat adjustment switch with worn contacts
- Open circuit, short to ground, or short to battery voltage (B+) in the rear lift switch wiring
- Corroded, bent, or loose pins in seat or switch connectors
- Driver seat module (DSM) with internal input detection failure
- Rear lift actuator with mechanical or electrical overload altering circuit reference
3. Symptoms You Will Notice
- Rear seat section does not move upward electrically
- Seat adjustment may work for other directions but not rear lift
4. Step-by-Step Diagnosis
Scan for B1725 and check related seat module data
Inspect switch and connector for damage, corrosion, or loose pins
Test switch continuity and voltage signals at the module connector
Check wiring for opens, shorts to ground, or shorts to power
If wiring and switch are good, suspect faulty seat module or actuator
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive. The fault only affects the rear seat lift adjustment and does not impact vehicle safety systems.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the switch, wiring, or module needs replacement.