How to Troubleshoot Your Nissan Sentra Mirror
Gone are the days when the only purpose of a Nissan Sentra mirror is to let you see what's behind you. Recently, the component has been optimized to solve some of the common issues that drivers have had. For example, with the anti-glare function, you can easily tilt the mirror to avoid getting blinded by the sun's rays during the day or by the vehicles' high-beam headlights at night. The mirror can also have an auto-dimming function. This function prevents glare in a different way-by automatically dimming the component based on the brightness that its sensor detects. However, with these high-tech functions, you are also faced with more problems should the mirror go bad. When you realize that the one in your car is not working as it normally does, it is time for you to troubleshoot.
Listen for running motors
When troubleshooting an electric rear-view mirror in your Nissan Sentra, you don't have to start the engine. Just turn the ignition switch to accessory so you can operate the rear-view mirror control switch and listen. If you can hear the motors running, then there might be a problem with the drive mechanism inside the mirror housing and the component must be replaced.
Check the fuse
If the rear-view mirror electronic functions fail to operate, then the fuse must have blown. Refer to your owner's manual or the fuse box cover to find the fuse diagram. There, you will see which fuse is used for the electric rear-view mirror in your car. Remove that fuse and inspect it. If the small, metal filament inside it appears to be broken or corroded, then replace the fuse.
Inspect the wiring
Just because you have replaced the blown fuse doesn't mean you have already solved the problem. A blown fuse means that a wire must have shorted or opened. To confirm this possibility, look inside the mirror and check for broken or loose wires. The mirror glass should be easy to remove after you carefully take out the hardware holding it.
Test for incoming voltage
If the wires inside the mirror are fine but the functions are still not working, then the component might not be receiving sufficient voltage. To test this hypothesis, dismount the control switch from the panel without disconnecting any wires. Then, turn the ignition on again and, using a test light, check for incoming voltage at the control switch. If there is no voltage incoming, then look for any open- or short-circuit in the wires connecting the switch to the fuse panel.