Fan Control Relay Inspection; Fan Motor Does Not Start - Honda GL1800 Service Manual

FAN CONTROL RELAY
INSPECTION
Check that the engine control module (ECM) stores
failure code 7 before inspection (page 5-16).
If the ECM stores failure code 7, perform the trou-
bleshooting on page 5-19.

Fan motor does not start

1. Remove the relay blocks (page 20-16).
Turn the ignition switch to "OFF" and remove
the fan control relay.
2. Turn the ignition switch to "ON" and measure
the voltage between the Black/blue wire terminal
(+) and ground (–).
There should be battery voltage.
• If there is battery voltage, go to step 3.
• If there is no voltage, check the following:
– blown No. 7 fuse
– open circuit in the Black/blue wire
3. Turn the ignition switch to "OFF" and connect
the Blue and Black/blue wire terminals with a
jumper wire.
Turn the ignition switch to "ON."
The cooling fan should start.
– If the cooling fans start, go to step 4.
– If the cooling fans do not start, check the
following:
– faulty cooling fan
– open circuit in the Blue and Green wires
4. Exchange the fan control relay with a known-
good one.
Start the engine and warm it up and check the
cooling fans.
• If the cooling fans start, replace the fan control
relay.
• If the cooling fans do not start, check for an open
circuit in the Black/red wire between the relay
and engine control module.
LIGHTS/METERS/SWITCHES
AN CONTROL RELAY
AN CONTROL RELAY
CONNECTOR
Black/blue
Blue
JUMPER WIRE
20-41