Combination Meter ASSY

Fig 1: Identifying Combination Meter Assy ECU Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ECU TERMINALS SPECIFIED CONDITION

Symbols (Terminals No.)	Wiring Color	Terminal Description	Condition	Specified Condition
POWER GND (C8-1) - Body ground	W-B - Body ground	Ground	Constant	Continuity
ILL- (C8-2) - Body ground	W-B - Body ground	Illumination signal	Headlight switch ON, Light control rheostat position MIN --> MAX	Puls generation (*2)
AIR SUS LOADING MODE (C8-3) - Body ground	G - Body ground	AIR SUS signal	Ignition switch ON, AIR SUS LOADING MODE indicator ON --> OFF	Below 1 V --> 10 to 14 V
CHECK ENGINE (C8-4) -Body ground	BR - Body ground	CHECK ENGINE signal	Ignition switch ON, CHECK ENGINE warning light ON --> OFF	Below 1 V --> 10 to 14 V
MPX + (C8-5)	Y	Communication signal	Communication circuit	-
4P (C8-6) - Body ground	LG - Body ground	Speed signal (Output)	Ignition switch ON and turn the wheel slowly	Puls generation (*3)
TACH (C8-7) - Body ground	W - Body ground	Tachometer signal	Engine running	Puls generation (*4)
IG2 (C8-8) - Body ground	GR - Body ground	Ignition switch signal	Ignition switch OFF --> ON	Below 1 V --> 10 to 14 V
AIR SUS OFF (C8-9) - Body ground	W - Body ground	AIR SUS signal	Ignition switch ON, AIR SUS OFF indicator ON --> OFF	Below 1 V --> 10 to 14 V
AIR SUS LO (C8-10)- Body ground	GR - Body ground	AIR SUS signal	Ignition switch ON, AIR SUS LO indicator ON --> OFF	Below 1 V --> 10 to 14 V
AIR SUS N (C8-11)- Body ground	R - Body ground	AIR SUS signal	Ignition switch ON, AIR SUS N indicator ON --> OFF	Below 1 V --> 10 to 14 V
AIR SUS HI (C8-12) - Body ground	V - Body ground	AIR SUS signal	Ignition switch ON, AIR SUS HI indicator ON --> OFF	Below 1 V --> 10 to 14 V
TURN R (C8-13) - Body ground	P - Body ground	Turn signal right	Turn signal RH indicator light OFF --> ON	Below 1 V --> 10 to 14 V
TURN L (C8-14) - Body ground	B - Body ground	Turn signal left	Turn signal LH indicator light OFF --> ON	Below 1 V --> 10 to 14 V
ECU+B (C8-15) - Body ground	SB - Body ground	Battery	Any Contents	10 to 14 V
DOME+B (C8-16) - Body ground	O - Body ground	Battery	Any Contents	10 to 14 V
SIGNAL GND (C9-1) - Body ground	W-B - Body ground	Ground	Constant	Continuity
FE (C9-2) - Body ground	SB - Body ground	Fuel ground	Constant	Continuity
MPX - (C9-4)	V	Communication signal	Communication circuit	-
ABS (C9-6) - Body ground	R - Body ground	ABS signal	Ignition switch ON, ABS warning light ON --> OFF	6.7 to 12 V --> Below 1 V
BRAKE (C9-7) - Body ground	P - Body ground	Brake signal	Ignition switch ON, BRAKE warning light ON --> OFF	6.7 to 12 V --> Below 1 V
BRAKE LEVEL (C9-8) - Body ground	W - Body ground	Brake fluid level signal	Ignition switch ON, brake fluid level (LO) --> NORMAL	Below 1 V --> 10 to 14 V
VSC (C9-9) - Body ground	O - Body ground	VSC signal	Ignition switch ON, VSC warning light ON --> OFF	Below 1 V --> 10 to 14 V
H-LP LEVEL (C9-10) - Body ground	B - Body ground	Headlight level signal	Ignition switch ON, H-LP LEVEL indicator ON --> OFF	Below 1 V --> 10 to 14 V
AFSOFF (C9-12) - Body ground	L - Body ground	AFS OFF signal	Ignition switch ON, AFS OFF indicator light ON --> OFF	Below 1 V --> 10 to 14 V
RE (C9-13) - Body ground	W - Body ground	Rheostat trip switch signal (RE)	Constant	Continuity
VR (C9-14) - Body ground	O - Body ground	Rheostat trip switch signal (VR)	Ignition switch OFF --> ON	Below 1 V --> 4 to 6 V
RL (C9-15) - Body ground	B - Body ground	Rheostat trip switch signal (RL)	Ignition switch OFF --> ON	Below 1 V --> 4 to 6 V
TCAN SW (C9-16) - Body ground	Y - Body ground	Rheostat trip switch signal (Tail cancel switch)	Ignition switch ON, rheostat trip switch (TCAN SW) OFF --> ON	Below 1 V --> 4 to 6 V
ODOATRIP SW (C9-17) - Body ground	L - Body ground	Rheostat trip switch signal (ODOATRIP switch)	Ignition switch ON, rheostat trip switch (ODOATRIP SW) OFF --> ON	Below 1 V --> 4 to 6 V
SPEED SIGNAL (C9-18) -Body ground	BR - Body ground	Speed signal (Input)	Ignition switch ON and turn the wheel slowly	Puls generation (*3)
FUEL SENDER (C9-19) -Body ground	V - Body ground	Fuel signal	Fuel sender gauge is F position --> E position	Below 1 V --> 4.5 to 6.7 V
P-SEAT BELT (C9-22) - Body ground (*1)	R - Body ground	Passenger seat belt signal	Ignition switch ON, sit on the passenger seat, seat belt unfastened --> fastened	Below 1 V --> 10 to 14 V
RR LIGHT (C9-23) - Body ground	G - Body ground	Rear light failure signal	Ignition switch ON, RR light failure indicator light ON --> OFF	Below 1 V --> 10 to 14 V
WASHER LEVEL (C9-24) -Body ground	LG - Body ground	Washer level signal	Ignition switch ON, washer level warning light ON --> OFF	Below 1 V --> 10 to 14 V

*1: w/ LEXUS Navigation System

*2: Reference: Using oscilloscope:

ITEM AND CONTENTS

Item	Contents
Tool setting	2 V/ DIV, 1 ms/ DIV
Vehicle condition	Ignition switch ON

HINT:

Duty ratio changes as illumination becomes darker ("A" becomes longer).

Fig 2: Identifying Oscilloscope Waveform Graph

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*3 Reference: Using oscilloscope:

ITEM AND CONTENTS

Item	Contents
Tool setting	5 V/ DIV, 20 ms/ DIV
Vehicle condition	Driving at approx. 20Km/h

Fig 3: Identifying Oscilloscope Waveform Graph

*4: Reference: Using oscilloscope:

ITEM AND CONTENTS

Item	Contents
Tool setting	5 V/ DIV, 10 ms/ DIV
Vehicle condition	Engine idle speed

Fig 4: Identifying Oscilloscope Waveform Graph