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How the Circuit Works
Voltage is provided at all times to the radiator fan
relay contacts through fuse 57 (in the main
under-hood fuse/relay box), and to the A/C
condenser fan relay contacts through fuse 58 (in
the main under-hood fuse/relay box). With the
ignition switch ON (II) and the engine not cranking,
voltage is provided to the coils of the relays
through fuse 20 (in the under-dash fuse/relay box).
The relays are grounded through the ECM.
Grounding the relays energizes their coils and
applies battery voltage to the radiator and
condenser fan motors. Both fans then run until
ground is removed from the relay coils.
Refer to the Service Manual (Section 10, Cooling
System) for specific tests and troubleshooting
procedures.
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