What Does B1700 Mean?
This code indicates the Body Control Module (BCM) or Supplemental Restraint System (SRS) module has detected a short to ground in the passenger seat belt pretensioner tension reducer circuit. The tension reducer is part of the active seatbelt system that adjusts belt tension during normal driving and collisions. A short to ground means the circuit voltage is being pulled to chassis ground, preventing proper operation of the tension reducer actuator.
Common Causes
45%
Damaged or chafed wiring harness between BCM/SRS module and passenger seat belt pretensioner, causing wire insulation breach and ground contact
30%
Faulty passenger seat belt pretensioner tension reducer actuator with internal short to ground
15%
Corroded or moisture-damaged connector at passenger seat belt pretensioner causing short circuit path to ground
10%
Failed BCM or SRS control module with internal driver circuit fault creating false short detection
Diagnostic Steps
1
Step 1: Perform visual inspection of passenger seat belt pretensioner wiring harness from seat base to BCM/SRS module location, checking for pinched, chafed, or damaged wires, particularly at seat track movement points and routing through door jamb areas
2
Step 2: Disconnect passenger seat belt pretensioner connector and inspect terminals for corrosion, moisture intrusion, bent pins, or heat damage; clean and apply dielectric grease if corrosion present
3
Step 3: Using a digital multimeter, measure resistance between the tension reducer control wire terminal (at the disconnected harness side) and chassis ground; reading should be infinite ohms (open circuit). If resistance is below 10k ohms, trace and repair short in harness
4
Step 4: With pretensioner disconnected, measure resistance across the tension reducer actuator terminals at the pretensioner component side; compare to manufacturer specifications (typically 2-5 ohms). Then measure each actuator terminal to pretensioner housing ground; should read infinite ohms
5
Step 5: If all wiring and component tests pass, perform BCM/SRS module circuit driver test using advanced scan tool bi-directional controls to activate tension reducer while monitoring current draw; excessive current indicates module internal fault
6
Step 6: After repairs, clear codes, perform SRS system initialization procedure per manufacturer specifications, and road test vehicle while monitoring live data for proper tension reducer operation during normal driving conditions
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) or Supplemental Restraint System (SRS) module has detected a short to ground in the passenger seat belt pretensioner tension reducer circuit. The tension reducer is part of the active seatbelt system that adjusts belt tension during normal driving an...
The most common cause of B1700 (Passenger's Seatbelt Tension Reducer Circuit Short to Ground) is: Damaged or chafed wiring harness between BCM/SRS module and passenger seat belt pretensioner, causing wire insulation breach and ground contact
Typical repair costs for B1700 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive, but the passenger seat belt will not function with active tension control features, reducing occupant protection effectiveness during collisions. Repair should be completed promptly as this affects passive safety systems, and the SRS warning light will likely remain illuminated.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1700 to identify the root cause.
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Quick Info
Category
Body
System
Supplemental Restraint System (SRS) / Active Seat Belt System
Difficulty
Type
Manufacturer
Recommended Tools
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