Suzuki GSF650A Service Manual page 535

Troubleshooting
Step
1 1) Turn the ignition switch OFF.
2) Remove the right frame head cover. (GSF650A/UA)
Refer to "Exterior Parts Removal and Installation
(GSF650/S/A/SAK7) in Section 9D (Page 9D-6)".
3) Remove the left frame cover. Refer to "Exterior Parts
Removal and Installation (GSF650/S/A/SAK7) in Section
9D (Page 9D-6)".
4) Remove the fuse box mounting bolt. Refer to "ABS
Control Unit Coupler Disconnect and Connect (Page 4E-
69)".
5) Check the ABS control unit coupler and front wheel
speed sensor coupler for loose or poor contacts. If OK,
then disconnect the ABS control unit coupler.
6) Measure the resistance between "12" (B/R) and ground
at the ABS control unit coupler.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Resistance (Ω)
Normal value ("12" – Ground)
∞ Ω (Infinity)
(A)
Is the resistance between "12" and ground OK?
Action
I718H1450077-01
18 21
24 25
10 12 13 16
8 9
2 3 4
ABS control unit coupler
(Harness end)
(B)
I718H1450078-04
Yes
Go to Step 3.
ABS: 4E-48
No
Go to Step 2.