Lexus ES: Terminals Of Ecu

G128-1 (+B) - G128-20 (E)

BR - W-B

Power source (+B)

Always

11 to 14 V

G128-3 (SIG-) - G128-20 (E)

B - W-B

Ground

Always

Below 1 V

G128-4 (IND1) - G128-20 (E)

LG - W-B

Manual (SOS) switch red indicator illumination signal

For 2 seconds after turning the engine switch on (IG)

1 to 8.5 V

Engine switch off

Below 1 V

G128-5 (MCVD) - G128-20 (E)

B - W-B

Telephone microphone assembly power supply

Engine switch on (ACC)

4 to 6 V

Engine switch off

Below 1 V

G128-6 (MCI+) - G128-20 (E)

W - W-B

Receive microphone voice signal

Voice being input to telephone microphone assembly

A waveform synchronized with microphone voice signal is input

G128-7 (MCI-) - G128-20 (E)

R - W-B

Receive microphone voice signal

Always

Below 1 V

G128-13 (GSW) - G128-20 (E)

Y - W-B

Collision detection signal

Engine switch on (IG)

Pulse generation (Refer to waveform1)

G128-19 (IG2) - G128-20 (E)

P - W-B

Power source (IG)

Engine switch on (IG)

11 to 14 V

Engine switch off

Below 1 V

G128-20 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

G128-21 (SIG1) - G128-3 (SIG-)

R - G

Manual (SOS) switch button condition signal

Manual (SOS) switch not pressed

1.3 to 1.9 V

Manual (SOS) switch pressed

0.5 to 0.8 V

G128-22 (IND2) - G128-20 (E)

G - W-B

Manual (SOS) switch green indicator illumination signal

For 2 seconds after turning the engine switch on (IG)

1 to 8.5 V

Engine switch off

Below 1 V

G128-23 (SGND) - G128-20 (E)

Shielded - W-B

Shield ground

Always

Below 1 Ω

G128-25 (CANP)

R

CAN communication signal

-

-

G128-26 (CANN)

W

CAN communication signal

-

-

Tester connection

G128-13 (GSW) - G128-20 (E)

Tool setting

5.0 V/DIV., 20 ms/DIV.

Vehicle condition

Engine switch on (IG)