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 passenger door ECU receives signals from the defogger switch, the wiper switch and the rain sensor to operate the mirror defogger.
When the battery voltage is applied to the terminal as follows, the mirror defogger functions accordingly.
CIRCUIT DESCRIPTION
| Outer mirror position | HTR+ | HTR- |
|---|---|---|
| Mirror defogger operating | 12 V | Ground |
| Mirror defogger not operating | Open | 12 V |