1. Check the Fuses: Start with the simplest things. Check your vehicle's fuse box (usually under the hood or inside the cab) for any blown fuses related to the power seats. Your owner's manual will show you the fuse layout and which fuse(s) control the power seats.
2. Test the Switch:
* Visual Inspection: Carefully examine the seat switch itself. Look for any obvious damage, cracks, or debris inside.
* Try a Different Switch (if possible): If your truck has multiple power seat controls (e.g., driver and passenger), try using the other switch to operate the affected seat. If the problem persists, the issue is likely not with the switch.
* Clean the Switch: Use compressed air to blow out any dust or debris that might be interfering with the switch's contacts.
3. Inspect the Wiring:
* Access the Wiring: This will involve getting under the seat and possibly removing some trim panels. Be careful not to damage any wires.
* Look for Damage: Carefully inspect the wiring harness connecting the seat to the vehicle's electrical system. Look for any broken, frayed, or corroded wires. Pay close attention to the connections at both the seat and the switch. Wiggling the wires gently while trying to move the seat can help identify a problem.
* Check the Motor Connector: Make sure the connector to the motor itself is securely connected.
4. Test the Motor:
* Direct Power (Advanced, Proceed with Caution): This is a more advanced step and requires electrical knowledge. If you're comfortable with electricity, you can carefully bypass the switch and apply 12V power directly to the motor terminals (after disconnecting the harness). Use a multimeter to test voltage and ensure correct polarity to avoid damaging the motor. If the motor works with direct power, the problem lies in the switch or wiring. If you are not comfortable doing this, do NOT attempt it.
5. Check the Seat Track:
* Lubrication: Over time, the seat track mechanism can become stiff due to lack of lubrication. Try lubricating the track with a silicone-based lubricant. This is unlikely to fix a problem that only causes inch-long movements, but could improve overall seat movement.
* Obstructions: Carefully inspect the seat track for any obstructions that might be hindering movement.
6. Motor Replacement (Likely Culprit): If all else fails, the most likely culprit is a failing seat motor. These are relatively inexpensive and can be replaced. You'll need to find a replacement motor specifically for your year, make, and model of Chevy pickup.
Important Notes:
* Safety First: Always disconnect the battery's negative terminal before working with the vehicle's electrical system.
* Repair Manual: A repair manual specific to your 1999 Chevy pickup would be extremely helpful. These manuals provide detailed diagrams and instructions.
* Professional Help: If you are not comfortable with electrical work or automotive repair, it is best to take your truck to a qualified mechanic. The cost of professional repair may be less than the cost of damaging components attempting DIY repairs.
By systematically checking these areas, you should be able to pinpoint the source of the problem and get your electric seat working properly again. Remember safety precautions and seek professional help if needed.
