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Heater Main Relay Circuit

WARNING: This page is about a different car, the 2001 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

Remove heater main relay from engine room junction block. Check relay. See RELAYS  under COMPONENT TESTS. Replace relay as necessary. If relay is okay, check HTR (30-amp) fuse in engine compartment junction block. Replace HTR fuse as necessary. If HTR fuse is okay, repair wiring between heater main relay and ground, and between heater main relay and body ECU. If wiring is okay, check multiplex control system. See appropriate MULTIPLEX CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT.

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