Meter / Gauge System Terminals Of Ecu

Body Electrical. Lexus Gs430, Gs300. Uzs190 Grs190
Meter. Lexus Gs430, Gs300. Uzs190 Grs190

  1. CHECK COMBINATION METER ASSEMBLY

  1. CHECK SKID CONTROL ECU

  1. CHECK ECM

  1. CHECK COMBINATION METER INNER CIRCUIT

Meter / Gauge System -- Terminals Of Ecu



CHECK COMBINATION METER ASSEMBLY

Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Terminals Of Ecu


Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
IG (L31-1) - Body ground
R - Body ground
Engine switch signal
Engine switch off
Below 1 V
Engine switch on (IG)
10 to 14 V
TURN (L31-2) - Body ground
G - Body ground
Turn signal L
Engine switch on (IG), turn signal LH indicator light OFF
Below 1 V
Engine switch on (IG), turn signal LH indicator light ON
10 to 14 V
TURN (L31-3) - Body ground
O - Body ground
Turn signal R
Engine switch on (IG), turn signal RH indicator light OFF
Below 1 V
Engine switch on (IG), turn signal RH indicator light ON
10 to 14 V
MPX (L31-5) - Body ground
SB - Body ground
Multiplex communication circuit
-
-
CHK E/G (L31-8) - Body ground
R - Body ground
MIL
MIL ON
Below 4.2 V
MIL OFF
10 to 14 V
4P (L31-9) - Body ground
LG - Body ground
Speed signal (Output)
Engine switch on (IG) and turn the wheel slowly
Pulse generation (See waveform 2)
P SEAT BELT INPUT (L31-11) - Body ground
R - Body ground
Seat belt condition signal (Passenger side)
Passenger seat belt indicator is OFF
Below 1 V
Passenger seat belt indicator is blinking
10 to 14 V
MODE CHANGE SW (L31-15) - Body ground
B - Body ground
Steering pad switch signal
Mode change switch OFF
Below 1 V
Mode change switch ON
10 to 14 V
PH (L31-16) - Body ground
W - Body ground
Sunlight sensor signal
Meter is starting up
1 to 3.8 V
PH GND (L31-18) - Body ground
R - Body ground
Ground
Always
Below 1 Ω
FUEL SENDER FE (L31-19) - Body ground
Y - Body ground
Ground
Always
Below 1 Ω
S-GND (L31-20) - Body ground
V - Body ground
Ground
Always
Below 1 Ω
MPX-B (+B) (L31-21) - Body ground
B - Body ground
Battery
Always
10 to 14 V
DOME- (L31-22) - Body ground
L - Body ground
Battery
Always
10 to 14 V
MPX+ (L31-25) - Body ground
GR - Body ground
Multiplex communication circuit
-
-
TACHO (L31-27) - Body ground
L - Body ground
Tachometer signal
Engine running
Pulse generation (See waveform 1)
BRAKE LEVEL SW (L31-28) - Body ground
Y - Body ground
Brake fluid level signal
Brake fluid level warning light ON
Below 1 V
Brake fluid level warning light OFF
10 to 14 V
SPEED (L31-29) - Body ground
V - Body ground
Speed signal (Input)
Engine switch on (IG) and turn the wheel slowly
Pulse generation (See waveform 2)
ILL (L31-30) - Body ground
G - Body ground
Illumination signal
Engine switch on (IG)
Pulse generation
P SEAT BELT OUTPUT (L31-31) - Body ground
O - Body ground
Seat belt condition signal (Passenger side)
Passenger seat belt indicator is OFF
Below 1 V
Passenger seat belt indicator is blinking
10 to 14 V
FUEL SENDER FR (L31-34) - Body ground
BR - Body ground
Fuel level signal
Engine switch on (IG), fuel level is FULL
Below 1 V
Engine switch on (IG), fuel level is EMPTY
4 to 7 V
PH5V (L31-36) - Body ground
B - Body ground
Power source for sunlight sensor
Meter is starting up
4.7 to 5.2 V
P-GND (L31-40) - Body ground
W-B - Body ground
Ground (Power ground)
Always
Below 1 Ω


    Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Terminals Of Ecu

  1. Waveform 1 (Reference): Using an oscilloscope

    Item
    		Condition
    Symbols
    (Terminal No.)
    		TACHO (L31-27) - Body ground
    Tool Setting
    		5 V/DIV., 10 msec./DIV
    Vehicle Condition
    		Engine idle speed


    2. Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Terminals Of Ecu

  2. Waveform 2 (Reference): Using an oscilloscope

    Item
    		Condition
    Symbols
    (Terminal No.)
    		4P (L31-9) - Body ground
    SPEED (L31-29) - Body ground
    Tool Setting
    		5 V/DIV., 20 msec./DIV
    Vehicle Condition
    		Driving at approx. 20 km/h (12 mph)
    HINT:
    As vehicle speed increases, the cycle of the signal waveform narrows.

TELLTALE LIGHT ASSEMBLY
Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
TURN-L (f1-1) - Body ground
B - Body ground
Turn signal L
Engine switch on (IG), turn signal LH indicator light OFF
Below 1 V
Engine switch on (IG), turn signal LH indicator light ON
10 to 14 V
TURN-R (f1-2) - Body ground
B - Body ground
Turn signal R
Engine switch on (IG), turn signal RH indicator light OFF
Below 1 V
Engine switch on (IG), turn signal RH indicator light ON
10 to 14 V
DOME+B-L (f1-3) - Body ground
R- Body ground
Battery R
Always
10 to 14 V
SLIP (f1-5) - Body ground
BR - Body ground
Slip signal
Engine switch on (IG), slip indicator is OFF
10 to 14 V
Engine switch on (IG), slip indicator is blinking
Below 1 V
SEAT BELT (f1-6) - Body ground
Y - Body ground
Seat belt condition signal (Driver side)
Engine switch on (IG), driver seat belt indicator is OFF
10 to 14 V
Engine switch on (IG), driver seat belt indicator is blinking
Below 1 V
AIRBAG (f1-7) - Body ground
O - Body ground
Airbag signal
Engine switch on (IG), airbag indicator is OFF
10 to 14 V
Engine switch on (IG), airbag indicator is blinking
Below 1 V
BEAM (f1-8) - Body ground
Y - Body ground
BEAM signal
BEAM switch OFF
10 to 14 V
BEAM switch ON
Below 1 V
RR FOG (f1-9) - Body ground
G - Body ground
Rr fog signal
Rr Fog switch OFF
10 to 14 V
Rr Fog switch ON
Below 1 V
IG-L (f1-10) - Body ground
L - Body ground
Engine switch signal R
Engine switch off
Below 1 V
Engine switch on (IG)
10 to 14 V
IG-R (f1-11) - Body ground
R - Body ground
Engine switch signal L
Engine switch off
Below 1 V
Engine switch on (IG)
10 to 14 V
DOME+B-R (f1-12) - Body ground
L - Body ground
Battery L
Always
10 to 14 V
FR FOG (f1-14) - Body ground
O - Body ground
Fr fog signal
Fr fog switch OFF
10 to 14 V
Fr fog switch ON
Below 1 V
DOOR (f1-15) - Body ground
BR - Body ground
Door courtesy switch signal
Door indicator OFF
10 to 14 V
Door indicator ON
Below 1 V
TAIL (f1-16) - Body ground
G - Body ground
Tail signal
Tail signal switch OFF
10 to 14 V
Tail signal switch ON
Below 1 V
TURN L-G (f1-17) - Body ground
W- Body ground
Ground
Always
Below 1 Ω
TURN R-G (f1-18) - Body ground
W- Body ground
Ground
Always
Below 1 Ω

CHECK SKID CONTROL ECU

Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Terminals Of Ecu


3UZ-FE
Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
SP1 (A13-7) - Body ground
V-Y - Body ground
Speed signal
Engine switch on (IG), and turn wheel slowly
Pulse generation (See waveform 2)

3GR-FE, 3GR-FSE
Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
SP1 (A48-12) - Body ground
V-Y - Body ground
Speed signal
Engine switch on (IG), and turn wheel slowly
Pulse generation (See waveform 2)


    Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Terminals Of Ecu

  1. Waveform 2 (Reference) : Using an oscilloscope

    Item
    		Condition
    Symbols
    (Terminal No.)
    		SP1 (A13-7) - Body ground
    SP1 (A48-12) - Body ground
    Tool Setting
    		5 V/DIV., 20 msec./DIV
    Vehicle Condition
    		Driving at approx. 20 km/h (12 mph)

CHECK ECM

Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Terminals Of Ecu


Symbols (Terminal No.)
Wiring Color
Terminal Description
Condition
Specified Condition
TACHO (A7-16) - Body ground
W-L - Body ground
Tachometer signal
Engine is running
Pulse generation (See waveform 1)


    Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Terminals Of Ecu

  1. Waveform 1 (Reference): Using an oscilloscope

    Item
    		Condition
    Symbols
    (Terminal No.)
    		TACHO (A7-16) - Body ground
    Tool Setting
    		5 V/DIV., 20 msec./DIV
    Vehicle Condition
    		Driving at approx. 20 km/h (12 mph)

CHECK COMBINATION METER INNER CIRCUIT
This diagram shows all of the possible indicators on this vehicle. Some may not be present on the customer's vehicle.

Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Terminals Of Ecu


Lexus Gs430, Gs300. Uzs190 Grs190.Meter.Meter / Gauge System.Meter / Gauge System Terminals Of Ecu


Terminal No.
Wire Harness Side
L31(1)
GAUGE Fuse
L31(2)
Turn Signal Flasher (L)
L31(3)
Turn Signal Flasher (R)
L31(4)
-
L31(5)
Gateway ECU
L31(6)
-
L31(7)
-
L31(8)
ECM
L31(9)
Parts that uses speed signals (Stereo Component Amplifier, ECM)
L31(10)
-
L31(11)
Center Airbag Sensor
L31(12)
-
L31(13)
-
L31(14)
-
L31(15)
Steering Pad Switch
L31(16)
S/BEAM AMP
L31(17)
-
L31(18)
S/BEAM AMP
L31(19)
Fuel Sender Gage
L31(20)
Ground (Signal Ground)
L31(21)
MPX-B Fuse
L31(22)
DOME Fuse
L31(23)
-
L31(24)
-
L31(25)
Gateway ECU
L31(26)
-
L31(27)
ECM
L31(28)
Brake Fluid Level Warning Switch
L31(29)
Skid Control ECU
L31(30)
PANEL Fuse
L31(31)
Passenger Seat Belt Warning Light
L31(32)
-
L31(33)
-
L31(34)
Fuel Sender Gage
L31(35)
-
L31(36)
S/BEAM AMP
L31(37)
-
L31(38)
-
L31(39)
-
L31(40)
Ground