What Does B1705 Mean?
This code indicates the Body Control Module (BCM) or Seat Control Module has detected an electrical fault in the driver's seat recline rearward switch circuit. The control module is receiving an abnormal voltage signal, no signal, or a short circuit condition when monitoring the switch that commands the seat backrest to recline backward. This typically means the switch itself, its wiring, or its connections are compromised.
Common Causes
45%
Faulty driver seat recline rearward switch with internal open circuit or short
30%
Damaged or corroded wiring harness and connectors between seat switch and control module
15%
Broken or loose connector at the seat switch or control module
10%
Failed seat control module or BCM with internal circuit fault
Diagnostic Steps
1
Step 1: Perform visual inspection of the driver seat recline switch for physical damage, loose mounting, or obvious wear. Remove switch panel if necessary and inspect connector for corrosion, bent pins, or moisture intrusion
2
Step 2: Using a digital multimeter, test the recline rearward switch for proper continuity when pressed and open circuit when released. Compare readings to manufacturer specifications (typically closed circuit = less than 5 ohms resistance, open circuit = infinite resistance)
3
Step 3: Disconnect the seat switch connector and check wiring harness continuity from switch connector to the seat control module or BCM connector using a wiring diagram. Also test for shorts to ground or power on all switch circuit wires with switch disconnected
4
Step 4: With ignition on and switch connector attached, backprobe the switch circuit at the control module connector to verify proper voltage supply (typically 5V or 12V reference) and ground signal using a multimeter or oscilloscope
5
Step 5: If all wiring and switch test good, substitute a known-good seat recline switch or perform voltage/signal analysis at the control module to isolate a module fault. Clear codes and verify repair by actuating the seat recline function multiple times
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) or Seat Control Module has detected an electrical fault in the driver's seat recline rearward switch circuit. The control module is receiving an abnormal voltage signal, no signal, or a short circuit condition when monitoring the switch that commands...
The most common cause of B1705 (Seat Driver Recline Rearward Switch Circuit Failure) is: Faulty driver seat recline rearward switch with internal open circuit or short
Typical repair costs for B1705 range from $100 to $450, 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 functionality. The seat position will remain locked in its current position, but manual or other power seat adjustments may still function normally. Repair at convenience.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1705 to identify the root cause.
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Quick Info
Category
Body
System
Body Control / Seat Adjustment System
Difficulty
Type
Manufacturer
Recommended Tools
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