What Does B1764 Mean?
This diagnostic trouble code indicates that the Body Control Module (BCM) or Seat Control Module has detected a short to ground in the electrical circuit controlling the driver's seat downward movement motor. The control module detected abnormally low resistance or voltage in the circuit, indicating the power wire is making unintended contact with vehicle ground. This prevents proper operation of the seat height adjustment in the downward direction.
Common Causes
45%
Damaged or chafed wiring harness under the seat where wires rub against seat frame or track mechanisms
30%
Faulty seat motor with internal short to ground in the downward movement circuit
15%
Corroded or damaged connector terminals at seat motor or control module allowing moisture intrusion
10%
Failed seat control switch with internal short circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of all wiring under the driver's seat, paying special attention to areas where harness contacts metal seat frame, tracks, or moving components. Look for abraded insulation, pinched wires, or signs of heat damage
2
Step 2: Disconnect the seat height motor connector and measure resistance between the down motor control wire terminal (at harness side) and known good vehicle ground using a digital multimeter. Reading should show infinite resistance (open circuit); any continuity indicates a short to ground in the wiring
3
Step 3: If wiring tests good, measure resistance across the motor terminals with motor disconnected. Typical resistance is 2-5 ohms; measure each terminal to motor housing ground - should show infinite resistance. Low resistance to ground indicates internal motor short
4
Step 4: Inspect all connectors in the seat control circuit for corrosion, bent pins, or moisture. Clean contacts with electrical contact cleaner and check for proper terminal retention
5
Step 5: If all components test good, disconnect seat control switch and test for short to ground on the circuit wire. Replace switch if internal short is detected
6
Step 6: After repairs, clear codes, cycle seat through full range of motion multiple times, and verify code does not return during test drive over various road conditions
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This diagnostic trouble code indicates that the Body Control Module (BCM) or Seat Control Module has detected a short to ground in the electrical circuit controlling the driver's seat downward movement motor. The control module detected abnormally low resistance or voltage in the circuit, indicating...
The most common cause of B1764 (Seat Driver Front Down Circuit Short To Ground) is: Damaged or chafed wiring harness under the seat where wires rub against seat frame or track mechanisms
Typical repair costs for B1764 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 seat comfort adjustment and does not impact vehicle operation or safety systems. Repair at convenience, though prolonged short circuits can drain the battery or cause further electrical damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1764 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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