Suzuki GRAND VITARA Owner's Manual page 1695

Reference Waveform
NOTE
When ECM cannot read the transponder code at the first try, ECM tries to read the transponder code
repeatedly up to 8 times. The second waveform is the example showing that ECM read the transponder
code successfully at the second try.
Measurement terminals
Oscilloscope settings
Measurement condition
[A]: The transponder code read successfully at the first try.
[B]: The transponder code read successfully at the second try.
1. Serial communication line
2. Clock line
3. First try
4. Second try
CH1: G24-3 to G24-2
CH2: G24-4 to G24-2
CH1: 5 V/DIV
CH2: 5 V/DIV
TIME: 20 ms
Right after the ignition switch is turned ON, the waveform can be read.
Immobilizer Control System:
I4RS0AA30007-01
10C-23