Suzuki Wagon R Manual page 1611

7B-44 AUTOMATIC TRANSMISSION (4 A/T)
Step
4 1) Connect TCM couplers.
2) Disconnect solenoid wire harness coupler.
3) Turn ignition switch ON then measure volt-
age between "Bl" wire terminal of discon-
nected harness side coupler and engine
ground. (See figure.)
Is it 4 – 6 V?
Figure for Step 4
Action
1. "Bl" wire terminal
Yes
Intermittent trouble or
faulty TCM.
Check for intermittent
referring to "INTERMIT-
TENT AND POOR CON-
NECTION" in Section 0A.
If no trouble found, substi-
tute a known-good TCM
and recheck.
No
"Bl" wire shorted to power
circuit or poor connection
of terminal "E13-3".
If wire and connection are
OK, substitute a known-
good TCM.