Honda GL1800 Service Manual page 539

BRAKE SYSTEM (ABS)
5. Open Circuit Inspection Between ABS Control
Unit and Angle Sensor Modulator
Ground the White/blue terminal of the connector
(8) with a jumper wire. Check for continuity
between the White/blue terminal of the connec-
tor (4) and ground.
Is there continuity?
NO
YES
6. Modulator Inspection by Replacing the Front
and rear Modulators
Connect the control unit 12P connector (8). Dis-
connect the (2), (3), and (5) connectors from the
front and rear modulators. Connect the (2) and
(3) connectors to the rear modulator, and the (5)
and (4) connectors to the front modulator con-
versely. Perform the pre-start self-diagnosis and
retrieve the problem code and record it.
Is any problem code indicated?
CODE 6 – Faulty rear modulator assembly.
CODE 7 – Faulty ABS control unit.
7. Short Circuit Inspection Between the ABS Con-
trol Unit and Angle Sensor Modulator
Disconnect the ABS control unit 12P connector
(8). Check for continuity between the Orange/
white terminal of the connector (4) and ground,
and between the Pink/white terminal of the con-
nector (4) and ground.
Is there continuity?
NO
YES
16-22
– Open circuit in the wire between the
ABS control unit and modulator (angle
sensor).
– GO TO STEP 6.
– GO TO STEP 8.
– Short circuit in the wire between the
ABS control unit and modulator (angle
sensor).
(8)
(2)
(3)
(4)
(4)
(5)
(4)