A/F Heater Relay (Avalon, Camry, Camry Solara, Highlander & Sienna)
WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 2003 Toyota Tundra, 2003 Toyota Tacoma, 2003 Toyota Sienna, 2003 Toyota Sequoia, and 2003 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
A/F heater relay may also be referred to as A/F HTR relay, A/F sensor relay or A/F relay. Constant battery voltage is supplied from battery, through A/F heater fuse to one side of A/F heater relay. A/F heater fuse may also be referred to as A/F fuse. A/F heater relay is energized by MREL terminal of Engine Control Module (ECM). When A/F heater relay is energized, A/F heater relay provides battery voltage to +B terminal at Air Fuel (A/F) sensors. For A/F heater relay location, see A/F HEATER RELAY LOCATION .