Avalon, Camry, Camry Solara With A/T, Highlander & Sienna

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Remove A/F heater relay. See A/F HEATER RELAY LOCATION table.

A/F HEATER RELAY LOCATION

Application

Location

Avalon & Camry

In Fuse/Relay Box At Driver's Side Front Corner Of Engine Compartment

Camry Solara

In Small Fuse/Relay Box At Driver's Side Front Corner Of Engine Compartment, In Front Of Battery

Highlander

In Fuse/Relay Box At Driver's Side Front Corner Of Engine Compartment, Just In Front Of Strut Tower

Sienna

⁽¹⁾

⁽¹⁾	Located near Engine Control Module (ECM) behind passenger's side of instrument panel. See Fig 1.

Fig 1: Locating A/F Heater Relay (Sienna)

To test A/F heater relay continuity, using ohmmeter, check for continuity and no continuity between specified terminals on A/F heater relay. See Fig 2 and Fig 3 .
To test A/F heater relay operation, apply battery voltage and ground to A/F heater relay and use ohmmeter to check for continuity between specified terminals on A/F heater relay. See Fig 2 and Fig 3 . Replace A/F heater relay if defective.

Fig 2: Testing A/F Heater Relay (Avalon, Camry, Camry Solara With A/T & Highlander)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Testing A/F Heater Relay (Sienna)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002