Honda GL1800 Service Manual page 537

BRAKE SYSTEM (ABS)
6. Modulator Inspection by Replacing the Front
and Rear Modulators
Connect the control unit 12P connector (8). Dis-
connect the (2), (4) and (5) connectors from the
front and rear modulators. Connect the (5) and
(4) connectors to the front modulator, and the (2)
and (3) connectors to the rear modulator con-
versely. Perform the pre-start self-diagnosis and
retrieve the problem code, and record it.
Is there a problem code 6 or 7?
CODE 6 – Faulty ABS control unit.
CODE 7 – Faulty front modulator assembly.
7. Short Circuit Inspection Between ABS Control
Unit and Angle Sensor Modulator
Disconnect the ABS control unit 12P connector
(8). Check for continuity between the Orange/
green terminal of the connector (3) and ground,
and between the Pink/black terminal of the con-
nector (3) and ground.
Is there continuity?
NO
YES
8. Open Circuit Inspection Between ABS Control
Unit and Modulator
Short the Orange/green and Pink/black terminals
of the connector (8) with a jumper wire. Check
for continuity between the Orange/green and
Pink/black terminals of the connector (3).
Is there continuity?
NO
YES
16-20
– GO TO STEP 8.
– Short circuit in the wire between the
ABS control unit and modulator (angle
sensor).
– Open circuit in the wire between the
ABS control unit and modulator (angle
sensor).
– Faulty ABS control unit.
(2)
(3)
(3)
(8)
(5)
(4)
(3)