* Loose or Corroded Connections: The most common issue. The display's power and data connections, both at the mirror itself and along the wiring harness running to it, can become loose or corroded over time, especially if exposed to moisture. Check all connections for corrosion and ensure they are firmly seated. This might involve removing the mirror housing (carefully) to access the connections.
* Faulty Display Unit: The LCD screen or the electronics within the mirror itself could be failing. This is more likely if other functions of the mirror (like dimming) are also malfunctioning. Replacement is usually the only solution here.
* Faulty BCM (Body Control Module): The BCM controls many electrical functions in your truck, including the rearview mirror display. A malfunctioning BCM can cause intermittent or complete failure of various electrical components. This is a less likely cause if *only* the mirror display is affected, but it's a possibility.
* Wiring Harness Damage: Somewhere between the BCM and the mirror, the wiring harness might be damaged (e.g., pinched, frayed, rodent damage). This could cause intermittent power or data loss to the display. This is difficult to diagnose without a wiring diagram and a careful inspection of the harness.
* Low Voltage: While less likely to cause total blanking, consistently low voltage can make the display unreliable. Check your battery voltage and charging system to make sure everything is operating correctly.
Troubleshooting Steps:
1. Check the Fuses: Start by checking the relevant fuses in your fuse box(es) (under the hood and inside the cab). Your owner's manual will show you which fuses control the rearview mirror circuitry.
2. Inspect the Connections: As mentioned, carefully inspect all connections to the rearview mirror, both at the mirror itself and along the harness. Look for corrosion, loose wires, or broken wires. Clean any corrosion with a wire brush and electrical contact cleaner.
3. Try a Different Mirror (if possible): If you have access to a similar mirror from another Silverado (same year and model), try swapping it to rule out a problem with the mirror itself.
4. Battery Voltage Check: Use a multimeter to check your battery voltage with the engine running and off. Should be around 12.6V when off and 13.5-14.5V when running.
5. Professional Diagnosis: If the above steps don't solve the problem, take your truck to a qualified mechanic or auto electrician. They have the tools and expertise to diagnose more complex electrical issues, such as a faulty BCM or wiring harness damage.
Important Note: Working with vehicle electronics can be risky. If you're not comfortable working with car electrical systems, it's best to leave it to a professional to avoid further damage.
