What Does B1675 Mean?
This code indicates that the Body Control Module (BCM) has detected a short to ground in the driver's seat occupancy sensor circuit. The seat occupancy sensor is part of the supplemental restraint system (SRS/airbag system) and determines if the driver's seat is occupied to enable airbag deployment and other safety features. A short to ground means the signal wire is making unwanted contact with chassis ground, causing an abnormally low voltage reading at the control module.
Common Causes
45%
Damaged or chafed wiring harness under the driver's seat from seat track movement
30%
Faulty seat occupancy sensor (pressure mat or weight sensor) with internal short
15%
Corroded or damaged connector terminals at seat occupancy sensor or BCM
10%
Failed Body Control Module with internal circuit fault
Diagnostic Steps
1
Step 1: Perform visual inspection of all wiring and connectors under the driver's seat, checking for pinched, chafed, or damaged wires especially near seat track mounting points and against metal brackets
2
Step 2: Disconnect the seat occupancy sensor connector and measure resistance between the signal wire terminal (at the harness side) and chassis ground using a digital multimeter; should read infinite resistance (open circuit) if wiring is intact
3
Step 3: With connector still disconnected, measure resistance across the seat occupancy sensor terminals; compare readings to manufacturer specifications (typically 200-2000 ohms depending on system). A near-zero reading indicates internal sensor short
4
Step 4: Reconnect sensor and backprobe the signal wire at the BCM connector with a multimeter set to DC voltage; with ignition on, voltage should be 4.5-5V (pulled up by BCM). If voltage is at 0V with sensor disconnected, wiring harness has a short to ground
5
Step 5: If wiring and sensor test good, perform BCM power and ground circuit verification, then consider BCM internal fault. Clear codes, perform seat movement test cycles, and verify code does not return after repairs
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected a short to ground in the driver's seat occupancy sensor circuit. The seat occupancy sensor is part of the supplemental restraint system (SRS/airbag system) and determines if the driver's seat is occupied to enable airbag deployment ...
The most common cause of B1675 (Seat Driver Occupied Input Circuit Short To Ground) is: Damaged or chafed wiring harness under the driver's seat from seat track movement
Typical repair costs for B1675 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive, but airbag system functionality may be compromised, potentially preventing proper airbag deployment or causing unwanted deployment in some vehicles. The airbag warning light will likely be illuminated. Repair should be completed promptly to ensure full safety system operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1675 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS/Airbag)
Difficulty
Type
Manufacturer
Recommended Tools
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