10.25
ELECTRICAL
10
RELAYS
Operation
The relays, located next to the ECU, assist with component
operation such as the fan, fuel pump, etc.
The fan relay, controlled by the ECU, operates the fan.
The power relay, controlled by the ECU, turns on power for
components such as the fuel pump, injectors, etc.
The differential relay, controlled by the AWD switch and ECU,
operates the differential solenoid.
NOTE: See “Differential Relay Testing” on
page 10.34.
FAN RELAY
COLOR FUNCTION
Red
Fused 20-amp, unswitched FAN power
supply.
Yellow /Black
Fan 'ON' Command. Ground is supplied by
the ECU, closing the relay to turn on the fan.
Red / White
KEY-ON Battery power supply, switched
on by the key and LH control switches,
enables power to relay.
Orange / Black
KEY-ON Battery power supply, switched
on by the key and LH control switches,
enables power to relay.
POWER RELAY
COLOR FUNCTION
Red/White
KEY-ON Battery power supply, switched
on by the key and LH control switches,
enables power to relay. Tied to Fan Relay
terminal.
Gray/White
Relay “ON” command. The ECU supplies a
ground which closes the relay, supplying
power to run the fuel pump, injectors, etc.
Orange
Fused 15-amp, unswitched battery power
IN supply for EFI component operation.
Red/Black
EFI power output. 'ON' when ECU sends a
signal on the GRY/W wire, closing the
relay. Supplies 15-amp power for ECU-
controlled operation of EFI components.
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