1.Four-door independent one-touch auto up & down control, single key separately lift or lower each vehicle window.

2.Built-in window anti-pinch protection circuit: Window automatically rolls down when obstacles are detected during closing to prevent hand clamping injury.

3.Child safety lock function: One key locks all rear passenger window buttons to avoid children accidental misoperation.

4.Button backlight indicator, clear visible button position during night driving.

5.Anti-vibration & dust-proof sealed circuit design, stable signal output under bumpy road driving environment.

6.Plug-and-play direct replacement, all four window lifting functions recover instantly after connecting vehicle wiring harness without ECU programming.

1. Model Compatibility Distinction

LD-03021 (OE 20917577) only fits 2014–2020 Chevrolet Impala. It cannot match Chevrolet Silverado, Tahoe, Cobalt, Cruze and other series, and cannot interchange with other master window switches or single passenger window switches like LD-03020.

2. Pre-delivery Full QC Test Items

1. 50,000 times button pressing durability test
2. High-low temperature thermal shock aging test
3. Window anti-pinch function performance test
4. Dustproof & waterproof plug sealing test
5. Simulated road bump anti-vibration endurance test

3. Supply Advantage

Long-term stable ready stock, support small sample trial orders and full-container bulk export. Main supply cross-border auto parts wholesalers, overseas auto repair shops and auto parts retail stores.

4. Step-by-Step Plug & Play Installation Instruction

1. Pry open front left door interior trim panel with plastic pry tool;
2. Unplug multi-pin wiring harness connector behind master window switch;
3. Remove fixing clips and take out damaged original switch;
4. Install new LD-03021 switch, lock clips and reconnect wiring harness;
5. Reinstall door trim panel, all four window lift functions work normally without ECU programming.

5. Common Replacement Failure Scenarios

1. Any of four window buttons insensitive or completely invalid, corresponding glass cannot lift or lower;
2. Anti-pinch function fails, window cannot roll back automatically when blocked;
3. Child lock button malfunction, rear window buttons cannot be locked;
4. No backlight at night, button positions invisible;
5. Original switch shell aging cracking, window icons worn off completely.