What Does B1757 Mean?
This code indicates that the Body Control Module (BCM) or Seat Control Module has detected an electrical fault in the driver's seat rear vertical adjustment motor circuit. The control module has identified an open circuit, short circuit, or abnormal resistance in the wiring or motor that controls the rear (lumbar or rear height) downward movement of the driver's seat. This is a manufacturer-specific body code related to powered seat adjustment functionality.
Common Causes
35%
Faulty seat adjustment motor for rear down movement (worn brushes, internal short, or mechanical binding)
30%
Damaged wiring harness or connector to seat motor (pinched wires under seat rails, chafed insulation, corroded terminals)
20%
Defective seat control switch or switch assembly (internal contact failure, water intrusion)
15%
Failed seat control module or BCM internal driver circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of driver's seat wiring harness underneath the seat, checking for pinched wires, chafing against seat rails, damaged connectors, or corrosion at the seat motor connector. Move seat fully forward and back to expose all wiring.
2
Step 2: Using a digital multimeter, test for battery voltage (typically 12V) at the seat motor connector when the seat switch is activated in the rear-down position. Check both power and ground circuits while commanding the motor through the switch.
3
Step 3: If voltage is present at connector, disconnect the seat motor and measure resistance across motor terminals (typically 2-10 ohms for functional motor). Also check for continuity to ground which would indicate internal short.
4
Step 4: If motor tests good, check continuity of all wiring from the seat control switch through the harness to the motor connector using a multimeter. Wiggle wiring while testing to identify intermittent opens.
5
Step 5: Test the seat control switch by measuring continuity or voltage output at switch connector when activating the rear-down function. Replace switch if no signal output detected.
6
Step 6: After repairs, clear codes, cycle the seat adjustment through full range of motion multiple times, and verify code does not return. Test all seat movement directions for proper operation.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) or Seat Control Module has detected an electrical fault in the driver's seat rear vertical adjustment motor circuit. The control module has identified an open circuit, short circuit, or abnormal resistance in the wiring or motor that controls th...
The most common cause of B1757 (Seat Driver Rear Down Circuit Failure) is: Faulty seat adjustment motor for rear down movement (worn brushes, internal short, or mechanical binding)
Typical repair costs for B1757 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this affects comfort features only and does not impact vehicle operation or safety systems. Repair at convenience, though loss of seat adjustability may affect driver comfort and optimal driving position.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1757 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System - Power Seat Controls
Difficulty
Type
Manufacturer
Recommended Tools
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