Circuit Operation

The inside rearview mirror (electrochromic) uses two photocell sensors to determine light conditions in front and back of the vehicle. With the mirror switched off, the mirror is in a clear state.

The mirror receives its voltage from the HVAC Fuse in the fuse block through circuit 41. Ground is supplied through circuit 850 from G402. With the switch pressed to ON the backlight of the switch turns on. In the daytime, the mirror is in a clear state. At night, the mirror remains in a clear state until the glare of headlamps from behind increases to a point that exceeds the preset sensitivity of the mirror. The mirror then gradually becomes darker to absorb the glare. It remains dark until the glare of the headlamps diminish. when it then returns to a clear state.

In addition, a voltage is fed from the R/CMPT REL Fuse in the underhood electrical center through circuit 840 to the transaxle range switch. When the gear select lever is in the reverse position, voltage is sent through circuit 24 to the mirror. If the mirror is in the darkened state, this input causes the mirror to change to a clear state regardless of any glare. When the gear select lever is taken out of reverse, the mirror returns to normal operation.