Driver Seat Forward Switch Circuit Open
The B1718 code indicates an open circuit in the driver seat forward switch. This switch is part of the Driver Seat Module (DSM) or Memory Seat Module (MSM), which controls seat movement via electric motors. An open circuit means there is a break in electrical continuity between the switch and the control module, preventing the command signal from reaching the module. The module detects this abnormal condition by monitoring voltage or resistance in the switch circuit.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or internally worn driver seat forward switch
- Cut, corroded, or disconnected wiring between the switch and the DSM/MSM
- Loose, corroded, or bent pins in the switch connector
- Internal failure of the seat module (DSM/MSM) in the detection circuit
- Blown fuse in the seat power circuit
- Poor ground connection at the seat module
3. Symptoms You Will Notice
- Driver seat does not move forward when the switch is pressed
- Seat memory functions may not work properly
4. Step-by-Step Diagnosis
Check for blown fuses related to the seat power circuit
Inspect the driver seat forward switch and its connector for damage, corrosion, or loose pins
Test continuity and voltage at the switch and module connectors using a multimeter
If wiring and switch are good, test the DSM/MSM for internal faults
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive. The seat may not move forward, but the vehicle remains operable.
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.