Circuit Description
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
The Driver Door ECU receives signals from the defogger switch, the wiper switch and the rain sensor to operate the mirror heater.
When the battery voltage is supplied to the terminal as follows, the mirror heater functions accordingly.
MIRROR ASSEMBLY TERMINAL
| Outer mirror position | HTR+ | HTR- |
| Mirror heater operating | 12 V | Ground |
| Mirror heater not operating | Open | 12 V |