Automatic Turn Signal Canceling System
Automobiles use a turn signal canceling system actuated by steering wheel turn. But, motorcycles
turn with a bank additionally, and so have a smaller steer angle. This makes difficult to adopt an
automobile type turn signal canceling system because of inaccurate operation in motorcycles. So,
motorcycles adopt time & distance counting system.
The canceling system consists of a battery, turn signal control relay, distance sensor, and turn signal
switch. When the turn signal switch is pushed onto the right or left, the turn signals start blinking
and the control relay starts counting off 8 seconds. At the end of this time, the control relay starts
calculating distance traveled using pulses from the distance sensor in the speedometer. The control
relay keeps working even after the turn signal switch was released and returned to the neutral position
by spring force. When the motorcycle has traveled an additional 65 meters (213 foots), the control
relay shuts off the current, turns off the turn signal lights, and resets itself.
If the turn signal canceling system does not function prop-
erly, first check on the turn signal light and switch in Sec-
ond Step section in Lights and Switches Operation in the
Periodic Maintenance chapter
Next, inspect the following parts.
Turn Signal Control Relay
Distance Sensor (in Meter Unit) System
Turn Signal Control Relay Inspection
Never drop the turn signal control relay, especially
on a hard surface. Such a shock to the unit can
Battery Case Cover (see Battery Removal)
Turn Signal Control Relay [A]
Connect one 12 V battery and turn signal lights as indi-
cated in the figure, and count how many times the lights
blink for one minute.
Turn Signal Control Relay Connector [A]
Turn Signal Lights [B]
12 V Battery [C]
If the lights do not blink as specified, replace the turn sig-
nal control relay.
If the lights blink as specified, inspect the distance sensor
system (see Distance Sensor System Inspection).
Testing Turn Signal Control Relay Inspection
The Number of
Turn Signal Lights
(*): Cycle(s) per minute
(**): Corresponds to "one light burned out"
21 ∼ 23
140 ∼ 250
42 ∼ 46
ELECTRICAL SYSTEM 16-61
75 ∼ 95