Speed Pulse Signal Line; Cancel Signal Line - Honda GL1800 Service Manual

POWER INPUT LINE
Measure the voltage between the White/green wire
terminal (+) and ground (–).
There should be battery voltage with the ignition
switch turned to "ON."
• If there is no voltage check the following:
– open circuit in the White/green wire between
the 6P gray connector and HORN TURN relay
– HORN TURN relay

SPEED PULSE SIGNAL LINE

Make sure the speedometer operates properly
before inspection.
Connect the 6P gray connector.
Place the motorcycle on its center stand, shift the
transmission into neutral and turn the ignition
switch to "ON."
Measure the voltage between the White/black wire
terminal (+) and ground (–).
There should be 0 V to 5 V pulse voltage while
slowly turning the rear wheel by hand.
• If the pulse voltage is not present, check the fol-
lowing:
– open or short circuit in the White/black wire
between the 6P gray connector and combina-
tion meter
– loose or poor contact in related connectors

CANCEL SIGNAL LINE

Make sure the ground, turn signal on/off signal and
power input lines are OK before inspection.
Connect the 6P gray connector and turn the ignition
switch to "ON."
Measure the voltage between the Blue/black wire
terminal (+) and ground (–).
There should be no voltage when the turn signal
switch is pushed to " " or "
There should be battery voltage when the turn sig-
nal switch is pushed.
• If there is battery voltage in both conditions,
replace the turn signal cancel unit.
• If there is no voltage in both conditions, check
the following:
– open or short circuit in the Blue/black and Blue/
green wires between the 6P gray connector
and combination meter 3P connector (turn sig-
nal relay)
– faulty diode (D19) (page 20-32)
– loose or poor contact in related connectors
(viewed from the terminal side)
(viewed from the terminal side)
."
(viewed from the terminal side)
LIGHTS/METERS/SWITCHES
White/green
AIN WIRE HARNESS SIDE CONNECTOR
White/black
AIN WIRE HARNESS SIDE CONNECTOR
Blue/black
AIN WIRE HARNESS SIDE CONNECTOR
20-29