Suzuki 2006 SX4, Service Manual

Page: 1442 / 1478

10C-17 Immobilizer Control System:
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.
Terminal Circuit Normal Voltage Condition
G17-1 Power supply
About 12.0 V Ignition switch at ON position
0.0 V Ignition switch at OFF position
G17-2 Ground 0.0 V —
G17-3 Serial communication line
See the reference
waveform.
—
0.0 V Ignition switch at OFF position
G17-4 Clock line
See the reference
waveform.
—
0.0 V Ignition switch at OFF position
G17-5 Illumination ring control (if equipped)
0 V
• Ignition key not inserted to the key cylinder
• Door opened
0 V
→
12 V
• Ignition key at OFF position
• From the time door is closed to the time
interior light faded out completely
(As the interior light fades out, the voltage
increases.)
0 V
→
12 V
• Door closed
• From the ignition switch is turned ON to the
time interior light is completely faded out
(As the interior light fades out, the voltage
increases.)
G17-6
Illumination ring power supply
(if equipped)
About 12.0 V —
I6RW0CA30003-01
[A]: The transponder code read successfully at the first try. 2. Clock line
[B]: The transponder code read successfully at the second try. 3. First try
1. Serial communication line 4. Second try
Measurement terminals CH1: G17-3 to G17-2
CH2: G17-4 to G17-2
Oscilloscope settings CH1: 5 V/DIV
CH2: 5 V/DIV
TIME: 20 ms
Measurement condition Right after the ignition switch is turned ON, the waveform can be read.