What Does B1772 Mean?
This code indicates the Body Control Module (BCM) has detected a short to ground in the driver's seat backward movement circuit. The electrical circuit controlling the rearward motor or switch for the power driver's seat is shorted to chassis ground, causing excessive current flow and triggering fault protection. This prevents the seat from moving backward electronically.
Common Causes
40%
Damaged or chafed wiring harness under the seat where conductors contact metal seat frame or tracks
30%
Failed seat backward motor with internal short to ground
20%
Shorted seat switch or control module with internal component failure
10%
Corroded or damaged connector pins creating ground path at seat motor or BCM connector
Diagnostic Steps
1
Step 1: Perform visual inspection of all wiring under the driver's seat, particularly where harnesses contact metal seat rails and mounting brackets. Look for worn insulation, pinched wires, or exposed copper conductors.
2
Step 2: Disconnect the driver's seat backward motor connector and measure resistance from the motor control wire to chassis ground using a digital multimeter. Reading should be infinite (open circuit); less than 10k ohms indicates short to ground.
3
Step 3: If motor tests good, disconnect the seat switch/control module connector and test resistance from the backward circuit wire to ground at the BCM side of the harness. This isolates whether the short is in the motor, switch, or wiring harness.
4
Step 4: If wiring harness shows short to ground, carefully inspect entire length from BCM to seat, checking for damaged insulation at all flex points and connector entry points. Repair or replace damaged sections.
5
Step 5: After repairs, reconnect all components, clear the code, and operate the seat backward function through multiple cycles while monitoring for code recurrence to verify proper repair.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short to ground in the driver's seat backward movement circuit. The electrical circuit controlling the rearward motor or switch for the power driver's seat is shorted to chassis ground, causing excessive current flow and triggering fau...
The most common cause of B1772 (Seat Driver Backward Circuit Short To Ground) is: Damaged or chafed wiring harness under the seat where conductors contact metal seat frame or tracks
Typical repair costs for B1772 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 only affects power seat adjustment convenience feature. The seat position will remain locked in place and should be manually adjusted if needed before driving to ensure proper pedal reach and visibility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1772 to identify the root cause.
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Quick Info
Category
Body
System
Body Control / Power Seat System
Difficulty
Type
Manufacturer
Recommended Tools
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