Suzuki Wagon R Manual page 2309

6E2-28 ENGINE AND EMISSION CONTROL SYSTEM (M13 ENGINE)
Electronic Control System
Engine control module (ECM) removal and installa-
tion
CAUTION:
As ECM consists of precision parts, be careful not to
expose it to excessive shock.
Removal
1) Disconnect battery negative cable at battery.
2) Disable air bag system, refer to "Disabling Air Bag System"
in Section 10B if equipped.
3) Remove glove box.
4) Disconnect ECM (1) and TCM (2) (if equipped) couplers.
5) Loosen 2 nuts (3) and remove ECM and TCM (if equipped).
Installation
Reverse removal procedure noting the following:
• Connect couplers to ECM and TCM (if equipped) securely.