What Does B1663 Mean?
This diagnostic trouble code indicates that the Body Control Module (BCM) or Seat Control Module has detected that the driver's seat vertical adjustment motor has stalled or stopped moving while power was being applied. The control module monitors motor current draw and position feedback, and when it detects excessive current or lack of movement during an up/down command, it sets this code. This typically means the motor is physically jammed, mechanically obstructed, or electrically overloaded.
Common Causes
35%
Foreign object lodged in seat track or binding mechanism preventing seat movement
30%
Failed or worn seat height adjustment motor with internal damage or seized bearings
20%
Damaged or stripped gears in the seat height adjustment mechanism
10%
Corroded or loose electrical connections causing high resistance and motor stall
5%
Faulty seat control module or internal relay failure
Diagnostic Steps
1
Step 1: Perform visual and physical inspection of the driver's seat track and height adjustment mechanism. Manually attempt to move the seat up and down (with ignition off) to check for binding, obstructions, or unusual resistance. Remove any visible foreign objects like coins, toys, or debris.
2
Step 2: Using a digital multimeter, check voltage supply at the height adjustment motor connector during seat switch activation (should see battery voltage when switch is pressed). Then measure motor current draw with an inductive amp clamp - normal operation is typically 5-15 amps, while a stalled motor may draw 20+ amps.
3
Step 3: Disconnect the height adjustment motor and test it directly with a bench power supply or battery leads (12V). If motor runs freely when disconnected, the problem is mechanical binding in the seat mechanism. If motor does not run or draws excessive current, motor replacement is needed.
4
Step 4: Inspect all electrical connections at the motor, seat control switch, and control module for corrosion, pushed-back pins, or damage. Clean connections with electrical contact cleaner and apply dielectric grease.
5
Step 5: With motor reconnected, activate the seat height adjustment while observing the mechanism for gear engagement and smooth operation. Listen for grinding noises indicating stripped gears or mechanical failure.
6
Step 6: Clear the DTC code, cycle the seat through full up/down range multiple times, and verify the code does not return. Confirm proper operation and check for any related seat position codes.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
This diagnostic trouble code indicates that the Body Control Module (BCM) or Seat Control Module has detected that the driver's seat vertical adjustment motor has stalled or stopped moving while power was being applied. The control module monitors motor current draw and position feedback, and when i...
The most common cause of B1663 (Seat Driver Front Up/Down Motor Stalled) is: Foreign object lodged in seat track or binding mechanism preventing seat movement
Typical repair costs for B1663 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle safety or driveability, but may prevent proper driver seat positioning which could compromise driving comfort and ergonomics. The vehicle is safe to drive, though repair should be scheduled at convenience to restore full seat functionality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1663 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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