Driver Seat Rearward Position Circuit Open
Diagnostic trouble code B1770 indicates an open circuit in the driver seat rearward position circuit. This code is set when the Memory Seat Module (MSM) detects a break in the electrical circuit that controls the seat's rearward movement (recline or slide-back). The system monitors continuity and resistance in the adjustment motor circuit; when an open is detected, this code is stored. This fault prevents the driver seat from moving rearward, though other seat adjustments may still function depending on the vehicle configuration.
1. Commonly Affected Makes
2. Most Common Causes
- Damaged or disconnected wiring between the seat control module and the rearward adjustment motor
- Corroded or loose electrical connector in the seat circuit
- Seat adjustment motor with an internal open circuit
- Faulty Memory Seat Module (MSM)
- Blown fuse in the seat circuit
- Damaged seat control switch with broken internal contacts
3. Symptoms You Will Notice
- Driver seat does not move rearward (recline or slide back)
- Other seat adjustments may still work normally
4. Step-by-Step Diagnosis
Check for blown fuses in the seat circuit and replace if necessary.
Inspect wiring and connectors between the MSM and the rearward adjustment motor for damage, corrosion, or looseness.
Test the rearward adjustment motor for internal open circuit using a multimeter.
Verify the seat control switch continuity and replace if faulty.
If all else is good, suspect a failed MSM and perform module diagnostics.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is safe to drive. The fault only affects the driver seat rearward adjustment, not vehicle safety systems. However, you may not be able to adjust the seat to a comfortable position.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on the cause. A blown fuse or loose connector is cheap to fix, while replacing a seat motor or MSM can cost more.