What Does B1766 Mean?
This code indicates that the Body Control Module (BCM) or Seat Control Module has detected an open circuit in the driver's seat forward movement motor circuit. An open circuit means there is a break in the electrical path preventing current flow to the seat motor that moves the seat forward. This prevents the driver from adjusting the seat position forward using the power seat controls.
Common Causes
40%
Broken or disconnected wiring in the seat track harness due to repeated seat movement causing wire flexing and fatigue
30%
Failed seat forward movement motor with open windings or internal connection failure
20%
Corroded or loose connector terminals at the seat motor or control module connection points
10%
Faulty seat control switch with open contacts in the forward position circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of the driver's seat track area and underneath the seat for damaged, pinched, or disconnected wiring harnesses, paying special attention to areas where wires flex during seat movement
2
Step 2: Using a digital multimeter, check for continuity in the forward motor circuit from the seat control module connector to the seat motor connector with the harness disconnected (should read less than 5 ohms if intact)
3
Step 3: Test the seat forward motor directly by applying 12V battery voltage and ground to the motor terminals to verify motor operation and rule out internal motor failure
4
Step 4: Inspect all connector terminals for corrosion, backed-out pins, or damage, and check connector lock mechanisms are properly secured; clean or repair as needed
5
Step 5: Test the seat control switch by checking continuity through the forward switch contacts while activating the switch; replace switch if no continuity is present
6
Step 6: Clear the code, cycle the seat forward and backward several times, and verify the fault does not return using active tests or normal 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 open circuit in the driver's seat forward movement motor circuit. An open circuit means there is a break in the electrical path preventing current flow to the seat motor that moves the seat forward. This pr...
The most common cause of B1766 (Seat Driver Forward Circuit Open) is: Broken or disconnected wiring in the seat track harness due to repeated seat movement causing wire flexing and fatigue
Typical repair costs for B1766 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is safe to continue driving as it only affects driver seat adjustment convenience and does not impact vehicle operation or safety systems. However, ensure the seat is in a comfortable and safe driving position before operating the vehicle, as you will not be able to adjust it forward electronically.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1766 to identify the root cause.
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Quick Info
Category
Body
System
Power Seat Control System
Difficulty
Type
Manufacturer
Recommended Tools
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