Introduction to the Rearview Mirror Circuit

The electric rearview mirror is an important safety and convenience feature in modern vehicles like the 2005 Wing Tiger. The rearview mirror allows the driver to see what is behind the vehicle without having to turn around. In the Wing Tiger, the rearview mirror is electrically adjustable and includes features like auto-dimming to reduce glare from headlights of vehicles behind.

At the heart of the electric rearview mirror is the rearview mirror circuit. This circuit controls the motors that adjust the mirror position as well as the auto-dimming functionality. Understanding the rearview mirror circuit diagram is helpful for troubleshooting issues with the mirror or making modifications.

Components of the Rearview Mirror Circuit

The main components that make up the rearview mirror circuit in the 2005 Wing Tiger include:

• Rearview mirror assembly
• Adjustment motors (vertical and horizontal)
• Auto-dimming sensor
• Mirror control switch
• Wiring harness connectors
• Fuse and relay

The mirror glass itself is housed in the rearview mirror assembly, which connects to the headliner of the vehicle interior. Attached to the back of the mirror are the vertical and horizontal adjustment motors. These allow the driver to change the angle of the mirror remotely using the control switch.

Also on the back of the mirror is the auto-dimming sensor. This detects glare from headlights behind the vehicle and automatically darkens the mirror glass to compensate. The auto-dimming feature can usually be turned on and off with the mirror control switch.

Powering the rearview mirror circuit are wires that run from the vehicle’s electrical system. These connect via wiring harness connectors. A fuse protects the circuit from shorts or overloads, and a relay switches power on and off.

Rearview Mirror Circuit Diagram

Below is the circuit diagram for the electric rearview mirror in the 2005 Wing Tiger:

[Circuit diagram image]

As shown in the diagram, 12V power is supplied from the vehicle’s battery and ignition switch. This passes through a 10A fuse for protection. The power splits to the mirror control switch and a relay.

The mirror control switch is a multi-function switch that allows adjustment of the mirror position as well as turning the auto-dimming feature on and off. When the switch is toggled, it sends 12V power to the relay coil, closing the relay contacts and supplying power to the motors and auto-dimming sensor.

Two motors are used for adjusting the mirror – one for vertical adjustment and one for horizontal. These are standard 12V DC motors. Reversing the polarity of the applied voltage reverses the rotation direction, allowing the mirror to be tilted up/down and left/right.

The auto-dimming feature uses a lightsensitive sensor, EC mirror control module, and special EC mirror glass that can change its reflectivity. The sensor detects glare from headlights behind and sends a signal to the control module. This applies a voltage to the EC mirror glass, which contains a layer of electrochromic gel that darkens when voltage is applied. Removing the voltage allows the mirror to return to normal reflectivity.

Ground connections for the circuit are made through the metal body of the vehicle. The wiring harness connectors allow the mirror assembly to be easily detached for replacement.

Troubleshooting the Rearview Mirror

Using the circuit diagram as a reference, troubleshooting issues with the electric rearview mirror can be done systematically:

Symptom	Possible Causes	Diagnostic Steps
Mirror won’t adjust	Blown fuse Faulty relay Bad switch	Check fuse and relay continuity Check switch operation
Auto-dim inoperative	Sensor obstructed Damaged wiring harness Faulty EC control module	Clean sensor Check wiring for shorts Replace control module
Loose mirror	Loose mounting screws Broken plastic housing	Tighten screws Replace housing if cracked

In most cases, issues with the rearview mirror can be resolved by checking the fuses, wiring, and connectors for damage. If the motors or auto-dimming are not working, the mirror assembly may need to be replaced.

When reinstalling the mirror, be sure to properly route the wiring harness and secure the connectors. Improper wiring can lead to short circuits or fire hazards.

Modifying the Rearview Mirror Circuit

Some owners may wish to modify their rearview mirror circuit, such as adding a compass or backup camera display. Doing so requires splicing into the existing wiring.

It’s recommended to use a multimeter to identify the correct wires before cutting and splicing. Referring to the circuit diagram can help locate the 12V power, ground, and signal wires.

Any added devices should be fused appropriately to avoid overloading the circuit. Soldered connections with heat shrink insulation are preferred over crimp connectors for the most reliability.

FAQ

Can I replace just the mirror glass?

In most cases, the mirror glass is not sold separately from the housing and adjustment motors. If the glass is cracked or damaged, the entire mirror assembly should be replaced.

Why does my mirror tilt down when I put the car in reverse?

Some vehicles have a feature that automatically tilts the mirror down when in reverse to improve visibility of the ground behind the vehicle. This is a separate circuit from the standard mirror adjustment and auto-dimming. Consult your owner’s manual to see if your vehicle is equipped with this feature.

Can I upgrade to a mirror with a built-in displays or backup camera?

Yes, there are many aftermarket mirrors available that include features like displays, cameras, compass, and Homelink garage door openers. However, these require modifying the original wiring and may not fully integrate with other vehicle systems. Professional installation is recommended.

What are the symptoms of a failing auto-dimming sensor?

If the auto-dimming feature stops working, there are a few possible causes. First, check if the sensor is obstructed by dirt or moisture. Clean the sensor lens with a soft cloth. Next, cycle the feature on and off with the mirror control switch. If the feature is stuck on or off, the sensor may be damaged. Other symptoms of a failing sensor include the mirror flickering or struggling to return to normal reflectivity.

Can I disable the auto-dimming mirror feature?

Yes, the auto-dimming feature can be turned off using the mirror control switch. Look for a button with a light sensor icon. Pressing this button cycles between auto-dimming on and off. If the button does not work, there may be an issue with the wiring, relay, or control module. Refer to the troubleshooting steps above.

Conclusion

The electric rearview mirror is an important safety and convenience feature on modern vehicles like the 2005 Wing Tiger. At its core is a circuit that controls mirror positioning motors and an auto-dimming EC mirror glass. Understanding this rearview mirror circuit diagram is helpful for troubleshooting issues and planning modifications.

With proper care and maintenance, the electric rearview mirror provides years of reliable service. If issues do arise, referring to the circuit diagram and following systematic troubleshooting steps can help pinpoint the problem. When in doubt, consult a professional technician for diagnosis and repair.