Suzuki SY413 Service Manual page 2073

7B1-20 AUTOMATIC TRANSMISSION
1. "O/D OFF" lamp 5. Monitor connector No.1
2. DLC 6. Diagnosis switch terminal
3. SUZUKI scan tool 7. Ground terminal
4. Monitor connector No.2 8. Relay/Fuse box
[For vehicle without WU-TWC]
For automatic transmission control system, TCM has following
functions.
D When ignition switch is turned ON with O/D off switch turned
OFF and no malfunction in A/T control system is detected, "O/D
OFF" lamp lights for about 2 sec. after ignition switch is turned
ON and then goes OFF for bulb check. If O/D off switch is ON
at this time, however, "O/D OFF" lamp remains ON to let driver
known that gear is not shifted to overdrive gear (4th gear).
D When TCM detects a malfunction in A/T control system, it
flashes "O/D OFF" lamp.
D It is possible to communicate with TCM through data link con-
nector (DLC) by using SUZUKI scan tool (Tech-1).
(Diagnostic information can be checked and erased by using a
scan tool except DTC No.27, 36 and 38.)
D It is also possible to check DTC stored in TCM memory by flash-
ing of " O/D OFF" lamp with diagnosis switch terminal of monitor
connector No.2, which is located in relay/fuse box, grounded. If
no malfunction DTC is stored in TCM memory, DTC No.12 is out-
putted repeatedly. If one or more DTCs are stored in TCM
memory, they are outputted starting from smallest code number
in increasing order. After all DTCs are outputted, all DTCs are
outputted repeatedly.