Suzuki GSF1250 Service Manual page 515

Step
10 1) Turn the ignition switch OFF.
2) Remove the left frame cover. Refer to "Exterior Parts
Removal and Installation in Section 9D (Page 9D-6)".
3) Short the mode select coupler terminals (O – B/W) using
the special tool.
Special tool
(A): 09930–82710 (Mode select switch)
4) Check for continuity between "13" (O) and "24" (B/W) at
the coupler.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Continuity (
ABS control unit coupler (Harness end)
18
10
2
Is there continuity between "13" and "24"?
Action
(A)
B/W
)
( )
(A)
21
24
16
12 13
8
3
4
(A)
( )
Replace the ABS
control unit/HU.
O
I718H1450042-03
25
9
I718H1450043-02
Yes
Inspect the wire
harness. (Faulty mode
select switch wire)
ABS: 4E-22
No