What Does B1709 Mean?
This code indicates that the Body Control Module (BCM) has detected an electrical fault in the driver's seat front upward adjustment switch circuit. The BCM monitors the switch operation and has identified an open circuit, short circuit, or abnormal resistance in the wiring or switch itself. This prevents the power seat control system from receiving proper input signals when the driver attempts to raise the front portion of the seat.
Common Causes
45%
Faulty driver seat up switch with worn contacts or internal failure
30%
Damaged wiring harness or connector between seat switch and BCM with broken wires, corrosion, or loose pins
15%
Corroded or loose electrical connector at the seat switch or seat motor module
10%
Failed Body Control Module (BCM) with internal circuit board damage
Diagnostic Steps
1
Step 1: Perform visual inspection of the driver seat switch panel for physical damage, stuck buttons, or evidence of liquid intrusion. Disconnect the seat switch connector and inspect pins for corrosion, bent terminals, or pushed-back pins
2
Step 2: Using a digital multimeter, test the seat up switch for continuity by measuring resistance across the switch terminals while activating the up function. Should show less than 5 ohms when pressed and open circuit (infinite resistance) when released
3
Step 3: Check for voltage supply at the switch connector with ignition on using multimeter. Verify presence of battery voltage (approximately 12V) on the power supply pin and good ground (less than 0.5V) on ground circuit
4
Step 4: Inspect wiring harness under the seat by manually moving the seat through full range of motion while checking for intermittent opens or shorts. Look for pinched, chafed, or broken wires where harness flexes
5
Step 5: If all wiring and switch tests pass, perform BCM input signal test by monitoring live data for seat switch status while operating the switch to verify BCM is receiving proper signals
6
Step 6: After repair, clear codes, cycle the seat up switch multiple times, and verify code does not return. Test all seat functions to ensure proper operation
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected an electrical fault in the driver's seat front upward adjustment switch circuit. The BCM monitors the switch operation and has identified an open circuit, short circuit, or abnormal resistance in the wiring or switch itself. This pr...
The most common cause of B1709 (Seat Driver Front Up Switch Circuit Failure) is: Faulty driver seat up switch with worn contacts or internal failure
Typical repair costs for B1709 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is safe to continue driving as it only affects seat adjustment convenience features and does not impact vehicle operation or safety systems. Repair can be scheduled at driver's convenience, though proper seat positioning is important for optimal airbag and seatbelt performance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1709 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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