What Does B1651 Mean?
This code indicates the Body Control Module (BCM) or Seat Control Module has detected a fault in the electrical circuit controlling the driver's seat recline backward function. The control module has identified an abnormal voltage, current draw, or circuit integrity issue preventing proper operation of the seat recline motor when commanded to move backward. This is a manufacturer-specific body code affecting the power seat adjustment system.
Common Causes
35%
Faulty seat recline motor or internal motor windings damaged/shorted
30%
Damaged wiring harness or connector corrosion between BCM and seat motor
20%
Failed seat control switch or internal switch contact failure
10%
Mechanical binding or obstruction preventing motor operation causing overcurrent
5%
Body Control Module or Seat Control Module internal relay/driver circuit failure
Diagnostic Steps
1
Step 1: Perform visual inspection of seat recline motor connector and wiring harness for visible damage, corrosion, bent pins, or loose connections. Check for water intrusion or burned/melted wires.
2
Step 2: Using a digital multimeter, test voltage supply at the seat recline motor connector while activating the recline backward switch. Verify proper voltage (typically 12V) is present at the appropriate terminal when commanded.
3
Step 3: Disconnect the seat recline motor and perform resistance testing across motor terminals with multimeter. Compare readings to manufacturer specifications (typically 3-10 ohms). Infinite resistance indicates open circuit; near-zero indicates short.
4
Step 4: With motor disconnected, manually attempt to operate seat recline mechanism to check for mechanical binding or obstruction. Mechanism should move freely without excessive force.
5
Step 5: Test seat control switch by measuring continuity through switch contacts while operating recline backward function. Verify proper switch operation and ground circuit integrity.
6
Step 6: If all previous tests pass, connect a known-good seat motor or perform BCM output driver test using scan tool bidirectional controls to verify module can properly command the circuit. Replace faulty component and verify code clears after repair.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) or Seat Control Module has detected a fault in the electrical circuit controlling the driver's seat recline backward function. The control module has identified an abnormal voltage, current draw, or circuit integrity issue preventing proper operation...
The most common cause of B1651 (Seat Driver Recline Backward Circuit Failure) is: Faulty seat recline motor or internal motor windings damaged/shorted
Typical repair costs for B1651 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This issue does not affect vehicle drivability or safety systems and it is safe to continue driving. The driver may be unable to adjust seat recline position backward which could affect comfort and potentially limit proper driving position adjustment for some drivers.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1651 to identify the root cause.
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Quick Info
Category
Body
System
Body Comfort and Convenience System - Power Seat Control
Difficulty
Type
Manufacturer
Recommended Tools
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