What Does B1730 Mean?
This code indicates that the Body Control Module (BCM) has detected an open circuit in the driver's seat rear vertical adjustment switch circuit. The BCM monitors continuity and switch activation signals for the power seat rear down adjustment function. An open circuit means the electrical pathway is interrupted, preventing proper communication between the switch and the seat motor control module.
Common Causes
40%
Faulty or worn driver seat rear down switch with internal open circuit or broken contacts
30%
Damaged, corroded, or disconnected wiring harness or connector between switch and BCM/seat module
20%
Broken or loose ground connection in seat electrical circuit
10%
Failed Body Control Module or seat control module with faulty input circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of the driver seat adjustment switch assembly for physical damage, wear, or debris. Test switch operation manually for mechanical binding or abnormal resistance.
2
Step 2: Using a multimeter, check for continuity across the rear down switch terminals when activated (should show continuity/low resistance when pressed, infinite resistance when released). Typical reading should be less than 5 ohms when closed.
3
Step 3: Inspect the seat wiring harness from switch to BCM/seat module connector for cuts, abrasions, pinched wires under seat tracks, or corroded connectors. Check all connector pins for proper seating, corrosion, and terminal tension.
4
Step 4: With ignition on, backprobe the switch circuit at the BCM/seat module connector using a multimeter to verify voltage supply (typically 5-12V reference voltage) and ground circuit integrity (less than 0.5 ohms to ground).
5
Step 5: If wiring and grounds test good, substitute or test the switch assembly by monitoring circuit continuity while operating the switch. Replace switch if internal open circuit is confirmed.
6
Step 6: Clear codes and cycle the rear down switch multiple times while monitoring live data on scan tool to verify proper signal response. Confirm no other seat switch circuits show faults indicating a module-level issue.
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected an open circuit in the driver's seat rear vertical adjustment switch circuit. The BCM monitors continuity and switch activation signals for the power seat rear down adjustment function. An open circuit means the electrical pathway i...
The most common cause of B1730 (Seat Driver Rear Down Switch Circuit Open) is: Faulty or worn driver seat rear down switch with internal open circuit or broken contacts
Typical repair costs for B1730 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle safety or drivability. The vehicle is safe to operate, though the driver's seat rear height adjustment functionality will be inoperative until repaired. This is a convenience feature failure only.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1730 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Comfort Systems
Difficulty
Type
Manufacturer
Recommended Tools
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