Driver Seat Up Circuit Short to Ground
The B1662 code indicates a short-to-ground condition in the driver's front seat vertical adjustment circuit (UP function). This code is set by the seat control module when it detects a ground short in the wiring or motor that powers the seat lift function, preventing upward movement or causing erratic operation.
1. Commonly Affected Makes
2. Most Common Causes
- Seat lift motor wiring shorted to ground
- Driver seat lift motor with damaged insulation or shorted windings
- Corroded or damaged motor or control module connector with pins contacting chassis
- Seat control module with internal shorted ground control transistor
- Wiring harness rubbing against seat frame or chassis causing insulation wear
3. Symptoms You Will Notice
- Driver seat will not move upward
- Seat moves erratically or only downward
4. Step-by-Step Diagnosis
Inspect wiring and connectors between seat control module and lift motor for damage, corrosion, or chafing
Disconnect the lift motor and measure resistance between motor terminals and ground; a low reading indicates a shorted motor
Check for continuity to ground on the UP control wire at the module connector; if present, isolate the short in the harness or motor
If wiring and motor check out, suspect a faulty seat control module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the seat may not adjust upward, which can be inconvenient. The short could also cause a blown fuse or intermittent operation. It's best to repair it soon.
How much does it cost to fix?▼
Typically $150–$400, depending on whether the issue is a simple wiring repair or requires replacing the seat motor or control module.