Driver Window Master Switch Short to Ground
The B1550 code indicates that the Body Control Module (BCM) or Generic Electronic Module (GEM) has detected a short to ground in the power or control circuit of the driver's master window switch. This prevents proper operation of the power windows and can damage the module's internal driver if the condition persists.
1. Commonly Affected Makes
2. Most Common Causes
- Internal short circuit in the master window switch
- Chafed or pinched wiring in the switch power or signal circuit contacting the chassis
- Corrosion or moisture in the master switch connector causing a ground bridge
- Damaged output driver inside the BCM or GEM
3. Symptoms You Will Notice
- Driver's window or all power windows inoperative
- Intermittent window operation
- Window may work from passenger switches but not from master switch
4. Step-by-Step Diagnosis
Check for blown fuses related to power windows and replace if necessary.
Inspect the master switch connector for corrosion, moisture, or bent pins.
Test for continuity to ground on the switch power/signal circuits; if shorted, repair the wiring harness.
If wiring and switch are good, suspect a faulty BCM/GEM and perform module output test.
5. Frequently Asked Questions
Is it safe to drive?▼
The vehicle is generally safe to drive, but the power windows may not work, which could be a safety concern in an emergency. Additionally, the short could damage the BCM/GEM if left unrepaired, leading to more costly repairs.
How much does it cost to fix?▼
Repair costs vary: replacing the master switch typically ranges from $50 to $200, wiring repairs from $100 to $300, and BCM/GEM replacement from $300 to $800 including programming.