Honda GL1800 Service Manual page 534

4. ABS Control Unit Battery Voltage Inspection
• Disconnect the ABS control unit 5P connector
(7). Measure the voltage between the Red/
green terminal (+) of the connector (7) and
ground (–). There should be battery voltage at
all times.
Is there battery voltage?
NO – Open circuit in the wire between the
fuse box and ABS control unit.
YES – GO TO STEP 5.
5. Modulator Motor Ground Circuit Inspection at
ABS Control Unit
Check for continuity between the Green terminal
of the connector (7) and ground.
Is there continuity?
NO – Open circuit between in the Green wire.
YES – GO TO STEP 6.
6. Modulator Motor Short Circuit Inspection at
Modulator Connector
Disconnect the rear modulator control motor
connector (5). Check for continuity between the
Brown/light green terminal of the connector (5)
and ground, and between the Red/black terminal
of the connector (5) and ground.
Is there continuity?
NO – GO TO STEP 7.
YES – Short circuit in the wire between the
ABS control unit and modulator (control
motor).
BRAKE SYSTEM (ABS)
(7)
V
(7)
(5)
16-17