What Does B1652 Mean?
This code indicates the Body Control Module (BCM) has detected an open circuit in the driver's seat recline backward motor or switch circuit. An open circuit means there is a break in the electrical pathway preventing current flow when the recline backward function is commanded. This affects the power seat adjustment system, specifically the driver's seat backrest rearward tilt function.
Common Causes
40%
Broken or disconnected wiring between the seat switch and seat recline motor, often due to seat movement flexing and fatiguing the wires under the seat
30%
Failed seat recline motor with open internal windings or broken terminal connections
20%
Defective seat recline switch with open contacts or internal failure in the backward direction circuit
10%
Corroded or damaged connector terminals at the seat module, motor, or BCM connections causing loss of continuity
Diagnostic Steps
1
Step 1: Perform visual inspection under the driver's seat for damaged, pinched, or disconnected wiring harnesses and connectors, paying special attention to areas where wires flex during seat movement. Check all connectors for corrosion, bent pins, or looseness.
2
Step 2: Using a digital multimeter, test for voltage at the seat recline motor connector when the recline backward switch is activated (typically 12V). If no voltage present, trace circuit back toward the switch and BCM to locate the open.
3
Step 3: If voltage is present at the motor connector, disconnect the recline motor and perform a resistance test across the motor terminals for the backward direction circuit (typical reading 2-5 ohms). Infinite resistance indicates an open motor winding.
4
Step 4: Test the seat switch by accessing its connector and checking continuity through the recline backward circuit while operating the switch. Use wiring diagram to identify correct terminals. No continuity when activated indicates faulty switch.
5
Step 5: Perform continuity test of the entire wiring harness from BCM through switch to motor connector with all components disconnected. Wiggle wires during testing to identify intermittent opens. Repair or replace damaged sections as needed.
6
Step 6: After repairs, clear the code, cycle the seat recline function multiple times in both directions, and verify code does not return. Test seat operation through full range of motion to confirm proper repair.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an open circuit in the driver's seat recline backward motor or switch circuit. An open circuit means there is a break in the electrical pathway preventing current flow when the recline backward function is commanded. This affects the pow...
The most common cause of B1652 (Seat Driver Recline Backward Circuit Open) is: Broken or disconnected wiring between the seat switch and seat recline motor, often due to seat movement flexing and fatiguing the wires under the seat
Typical repair costs for B1652 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects driver comfort and seat positioning convenience. However, inability to adjust seat recline may affect proper driving posture and visibility, so repair should be completed within a reasonable timeframe for optimal driver ergonomics.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1652 to identify the root cause.
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Quick Info
Category
Body
System
Body Control / Power Seat System
Difficulty
Type
Manufacturer
Recommended Tools
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