Honda SH300 2006 Manual page 406

ANTI-LOCK BRAKE SYSTEM (ABS; SH300A/AII/AIII)
ABS INDICATOR STAYS ON (–Indicator does not go
off when the scooter is running, –Problem code is
not indicated by the retrieval procedure)
1. Fuse Inspection
Check the "ABS MAIN" fuse (10 A) in the fuse
box.
Is the fuse blown?
YES
NO
2. ABS Power Input Line Short Circuit Inspection
Disconnect the ABS modulator 25P connector.
Check for continuity between the ABS modulator
connector of the wire harness side and ground
with "ABS MAIN" fuse removed.
CONNECTION: Black/Yellow – Ground
Is there continuity?
YES
NO
3. ABS Power Input Line Open Circuit Inspection
Install the "ABS MAIN" fuse.
Disconnect the ABS modulator 25P connector.
Measure the voltage between the ABS modula-
tor of the wire harness side with the ignition
switch turned "ON".
CONNECTION: Black/Yellow (+) – Green (–)
Does the battery voltage exist?
YES
NO
18-12
– GO TO STEP 2.
– GO TO STEP 3.
– Short circuit in Black/Yellow
between the fuse box and ABS modula-
tor.
– Intermittent failure. Replace the "ABS
MAIN" fuse (10 A) with a new one, and
recheck.
– GO TO STEP 4.
– • Open circuit in Black/Yellow wire
between the fuse box and ABS mod-
ulator.
• Open circuit in Green wire between
the ABS modulator
ground.
• Loose or poor contact on the connec-
tor
Black/Yellow
wire
ABS MODULATOR
25P CONNECTOR
Black/Yellow
ABS MODULATOR
25P CONNECTOR
and body
"ABS MAIN" FUSE (10 A)
Green
Green