Terminals Of Ecu

WARNING: This page is about a different car, the 2005 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

Multi-display:

Fig 1: Identifying ECU Terminals (Multi-Display)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ECU TERMINALS REFERENCE (MULTI-DISPLAY)

Symbols (Terminals No.)	Wiring Color	Terminal Description	Condition	Specification
GND1 (M5-3) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
TX1+ (M5-4) - GND1 (M5-3)	P - W-B	AVC-LAN communication signal	Turn ignition switch to ON	2 to 3 V
TX1- (M5-5) - GND1 (M5-3)	L-B - W-B	AVC-LAN communication signal	Turn ignition switch to ON	2 to 3 V
TC (M5-7) - GND1 (M5-3)	P-B - W-B	Diagnosis ON signal	Turn ignition switch to the ON position	9 to 14 V
IG (M5-10) - GND1 (M5-3)	B-W - W-B	Ignition (ON)	Turn ignition switch OFF --> ON	Below 1 V --> 10 to 14 V
ACC (M5-11) - GND1 (M5-3)	GR - W-B	Accessory (ON)	Turn ignition switch OFF --> ACC or ON	Below 1 V --> 10 to 14 V
B1 (M5-12) - GND1 (M5-3)	L-W - W-B	Battery	Always	10 to 14 V
PKB (M5-16) - GND1 (M5-3)	R-W - W-B	Parking brake signal	Turn parking brake switch ON --> OFF	Below 1 V --> 10 to 14 V
SPD (M5-25) - GND1 (M5-3)	V - W-B	Speed signal from combination meter	See 6 vehicle signal check mode
SGND (M6-3) - GND1 (M5-3)	W-B - W-B	Screen noise or other types of noise occur	Ignition switch OFF	Below 1 V
MIN+ (M6-4) - GND1 (M5-3)	B - W-B	Microphone voice signal	See 11 microphone check	-
MIN- (M6-5) - Body ground	W - Body ground	Microphone voice signal	See 11 microphone check	-
MACC (M6-6) - GND1 (M5-3)	Y-G - W-B	Microphone Accessory	Turn ignition switch OFF --> ON	Below 1 V --> 10 to 14 V
TX3+ (M6-11) - GND1 (M5-3)	P-L - W-B	AVC-LAN communication signal	Turn ignition switch to ON	2 to 3 V
TX3- (M6-12) - GND1 (M5-3)	P-B - W-B	AVC-LAN communication signal	Turn ignition switch to ON	2 to 3 V
TX+ (M6-13) - GND1 (M5-3)	P - W-B	AVC-LAN communication signal	Turn ignition switch to ON	2 to 3 V
TX- (M6-14) - GND1 (M5-3)	L - W-B	AVC-LAN communication signal	Turn ignition switch to ON	2 to 3 V
SGND (M6-17) - GND1 (M5-3)	Shielded - W-B	Screen noise or other types of noise occur	Ignition switch OFF	Below 1 V
MCO+ (M6-18) - GND1 (M5-3)	B - W-B	Microphone voice signal	See 11 microphone check	-
MCO- (M6-19) - GND1 (M5-3)	W - W-B	Microphone voice signal	See 11 microphone check	-
IVO+ (M6-21) - GND1 (M5-3)	O - W-B	Telephone voice signal (bluetooth)	See 11 microphone check	-
IVO- (M6-22) - GND1 (M5-3)	W - W-B	Telephone voice signal (bluetooth)	See 11 microphone check	-
VR (M6-23) - GND1 (M5-3)	B - W-B	Video return signal	Turn ignition switch OFF	Below 1 V
R (M6-24) - GND1 (M5-3)	Y - W-B	Display signal (red)	Navigation display is on	Pulse generation *2
G (M6-25) - GND1 (M5-3)	W - W-B	Display signal (green)	Navigation display is on	Pulse generation *2
B (M6-26) - GND1 (M5-3)	R - W-B	Display signal (blue)	Navigation display is on	Pulse generation *2
SYNC (M6-27) - GND1 (M5-3)	G - W-B	Display signal (synchronize)	Navigation display is on	Pulse generation *1
VG (M6-28) - Body ground	Shielded - Body ground	Shielded ground	Always	Below 1 V
NTSC (M7-1) - GND1 (M5-3)	W - W-B	DVD screen is in disorder	Ignition switch ON and DVD displayed	Pulse generation *3
SGD1 (M7-4) - GND1 (M5-3)	B - W-B	Screen noise or other types of noise occur	Ignition switch OFF	Below 1 V
SGND (M7-5) - GND1 (M5-3)	Shielded - W-B	Screen noise or other types of noise occur	Ignition switch OFF	Below 1 V

*1: Oscilloscope wave
Terminal to be measured: SYNC - GND1

Setting for measurement: 500 mV/DIV10 ms/DIV

Condition: Navigation display is displayed.

Fig 2: Identifying Oscilloscope Waveform
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
*2: Oscilloscope wave
Terminal to be measured: R, G, B - GND1

Setting for measurement: 200 mV/DIV10 ms/DIV

Condition: Navigation map is switched.

Fig 3: Identifying Oscilloscope Waveform
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
*3: Oscilloscope wave
Terminal to be measured: NTSC - SGD1

Setting for measurement: 0.2 mV/DIV, 0.2 ms/DIV

Condition: Ignition switch ON and DVD displayed.

Fig 4: Identifying Oscilloscope Waveform
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Navigation ECU

Fig 5: Identifying Navigation ECU Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NAVIGATION ECU TERMINALS REFERENCE

Symbols (Terminals No.)	Wiring Color	Terminal Description	Condition	Specification
AUI+ (N2-1) - GND (N2-17)	P - W-B	Sound signal (input)	Audio system is playing	-
AUO+ (N2-2) - GND (N2-17)	P - W-B	Sound signal (output)	Audio system is playing	-
SLD1 (N2-3) - Body ground	Shielded - Body ground	Shielded ground	Always	Below 1.0 V
SPD (N2-5) - GND1 (N2-17)	V - W-B	Speed signal from combination meter	See "Vehicle Signal Check Mode" (see PRE-CHECK )	-
+B (N2-9) - GND (N2-17)	L-Y - W-B	Battery	Always	10 to 14 V
AUI- (N2-10) - GND (N2-17)	V - W-B	Sound signal (input)	Audio system is playing	-
AUO- (N2-11) -GND (N2-17)	V - W-B	Sound signal (output)	Audio system is playing	-
VOI+ (N2-12) - Body ground	O - Body ground	Telephone voice signal (bluetooth)	See 11 microphone check	-
VOI- (N2-13) - Body ground	W-Body ground	Telephone voice signal (bluetooth)	See 11 microphone check	-
REV (N2-14) - GND (N2-17)	R-B - W-B	Reverse signal from combination meter	See "Vehicle Signal Check Mode" (see PRE-CHECK )	-
GND (N2-17) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
ACC (N2-18) - GND (N2-17)	GR - W-B	Accessory (ON)	Turn ignition switch OFF --> ACC or ON	Below 1 V --> 10 - 14V
VR (N3-1) - GND (N2-17)	B - W-B	Video return signal	Turn ignition switch OFF	Below 1 V
R (N3-2) - GND (N2-17)	Y - W-B	Display signal (red)	Navigation display is on	Pulse generation 2
B (N3-3) - GND (N2-17)	R - W-B	Display signal (blue)	Navigation display is on	Pulse generation 2
TX+ (N3-5) - GND (N2-17)	P - W-B	AVC-LAN communication signal	Turn ignition switch to ACC	2 to 3 V
VG (N3-6) - Body ground	Shielded - Body ground	Shielded ground	Always	Below 1 V
G (N3-7) - GND (N2-17)	W - W-B	Display signal (green)	Navigation display is on	Pulse generation 2
SYNC (N3-8) - GND (N2-17)	G - W-B	Display signal (synchronize)	Navigation display is on	Pulse generation 1
TX- (N3-10) - GND (N2-17)	L-B - W-B	AVC-LAN communication signal	Turn ignition switch to ACC	2 to 3 V
MIC+ (N8-3) - GND (N2-17)	B - W-B	Microphone voice signal	See 11 microphone check	-
MIC- (N8-5) - GND (N2-17)	W - W-B	Microphone voice signal	See 11 microphone check	-
SNSE (N8-7) - Body ground	W-B - Body ground	Ground	Always	Below 1 V

Oscilloscope wave
Terminal to be measured: SYNC - GND1

Setting for measurement: 500mV/DIV 10 ms/DIV

Condition: Navigation display is displayed

Fig 6: Identifying Oscilloscope Waveform
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Oscilloscope wave
Terminal to be measured: R, G, B - GND1

Setting for measurement: 200mV/DIV 10 ms/DIV

Condition: Navigation map is switched.

Fig 7: Identifying Oscilloscope Waveform
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Radio receiver assembly

Fig 8: Identifying Radio Receiver Assembly Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

RADIO RECEIVER ASSEMBLY CONNECTOR TERMINALS REFERENCE

Symbols (Terminal No.)	Condition	STD Voltage (V)	Problem symptoms when short circuit is detected.
			Problem symptoms when short circuit is detected.
BU <--> GND (R37-1 <--> R37-20)	Always	10 - 14V	Audio system does not operate.
ILL+ <--> GND (R37-2 <--> R37-20)	Light control switch TAIL	10-14V	Audio head unit illumination does not come on.
TX+ (R37-5)	AVC-LAN Communication circuit	-	Audio system does not operate.
MUTE <--> GND (R37-7 <--> R37-20)	-	-	-
R+ <--> GND (R37-8 <--> R37-20)	Always	10-14V	Sound from right speaker is small
L+ <--> GND (R37-9 <--> R37-20)	Always	10 - 14V	Sound from left speaker is small
ACC <--> GND (R37-1 1 <--> R37-20)	Ignition switch ACC	10-14V	Audio system does not operate.
ILL- <--> GND (R37-12 <--> R37-20)	Light control switch TAIL	Below 0.5 V	Audio head unit illumination does not come on.
ANT <--> GND (R37-13 <--> R2-20)	Radio switch ON	10 - 14V	Antenna does not extend.
TX-(R37-15)	AVC-LAN Communication circuit	-	Audio system does not operate.
R- <--> GND (R37-18 <--> R37-20)	Always	10 - 14V	Sound from right side speaker is small.
L- <--> GND (R37-19 <--> R37-20)	Always	10 - 14V	Sound from left side speaker is small.
GND <--> Body ground (R37-20 <--> Body ground)	Always	Continuity	Audio system is normal.
TX+ (R36-9)	AVC-LAN Communication circuit	-	Navigation system does not operate.
TX-(R36-10)	AVC-LAN Communication circuit	-	Navigation system does not operate.
R+ (R38-2)	-	-	Sound from right side speaker is small
R-(R38-3)	-	-	Sound from right side speaker is small
L+ (R38-4)	-	-	Sound from left side speaker is small
L-(R38-5)	-	-	Sound from left side speaker is small
MUTE (R38-6)	-	-	Pop sound etc.
			Speaker does not sound
TX+ (R38-9)	AVC-LAN communication circuit	-	Audio system does not operate.
TX-(R38-10)	AVC-LAN communication circuit	-	Audio system does not operate.

Stereo component amplifier

Fig 9: Identifying Stereo Component Amplifier Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

STEREO COMPONENT AMPLIFIER CONNECTOR TERMINALS REFERENCE

Symbols (Terminal No.)	Condition	STD Voltage (V)	Problem symptom when open circuit is detected.
FR+ <--> E (S18-1 <--> S18-12)	Radio switch ON	5-7V	RH side speaker does not sound.
FL+ <--> E (S18-2 <--> S18-12)	Radio switch ON	5 -7 V	LH side speaker does not sound.
RR+ <--> E (S18-3 <--> S18-12)	Radio switch ON	5 -7 V	Rear RH side speaker does not sound.
RL+ <--> E (S18-4 <--> S18-12)	Radio switch ON	5-7V	Rear LH side speaker does not sound.
WFR+ <--> E (S18-5 <--> S18-12)	Radio switch ON	5 -7 V	Woofer speaker does not sound.
WFL+ <--> E (S18-6 <--> S18-12)	Radio switch ON	5-7V	Woofer speaker does not sound.
+B <--> E (S18-7 <--> S18-12)	Always	10-14V	All speaker does not sound
FR- <--> E (S18-8 <--> S18-12)	Radio switch ON	5 -7 V	RH side speaker does not sound.
FL- <--> E (S18-9 <--> S18-12)	Radio switch ON	5-7V	LH side speaker does not sound.
RR- <--> E (S18-10 <--> S18-12)	Radio switch ON	5 -7 V	Rear RH side speaker does not sound.
RL- <--> E (S18-11 <--> S18-12)	Radio switch ON	5 -7 V	Rear LH side speaker does not sound.
E <--> Body ground (S18-12 <--> Body ground)	Always	Continuity	-
GND2 <--> Body ground (S18-13 <--> Body ground)	Always	Continuity	-
WFR- <--> E (S18-14 <--> S18-12)	Radio switch ON	5-7V	Woofer speaker does not sound.
WFL- <--> E (S18-15 <--> S18-12)	Radio switch ON	5 -7 V	Woofer side speaker does not sound.
+B2 <--> GND2 (S18-16 <--> S18-13)	Always	10 - 14V	All speaker does not sound
MR+ <--> E (S19-1 <--> S18-12)	Always	5 -7 V	Sound from front RH speaker is small.
ML+ <--> E (S19-2 <--> S18-12)	Always	5-7V	Sound from front LH speaker is small.
TMUT <--> E (S19-3 <--> S18-12)	Radio switch ON	5-7V	Audio system does not operate.
BEEP (S19-4)	-	-	Beep does not sound.
TX+ (S19-5)	AVC-LAN communication circuit	-	Audio system does not operate.
N-MU <--> E (S19-9 <--> S18-12)	Radio switch ON	5 -7 V	Audio system does not operate.
R+ <--> E (S19-11 <--> S18-12)	Always	10 - 14V	Sound from RH speaker is small.
L+ <--> E (S19-12 <--> S18-12)	Always	10-14V	Sound from LH speaker is small.
SPD - E (S19-13 - S18-12)	-	-	-
MR- <--> E (S19-14 <--> S18-12)	Always	5-7V	Sound from front RH speaker is small.
ML- <--> E (S19-15 <--> S18-12)	Always	5-7V	Sound from front LH speaker is small.
TX-(S19-18)	AVC-LAN communication circuit	-	Audio system does not operate.
ACC <--> E (S19-20 <--> S18-12)	Ignition switch ACC	10-14V	Audio system does not operate.
MUTE <--> E (S19-21 <--> S18-12)	Radio switch ON	5 -7 V	Audio system does not operate.
SGND <--> E (S19-22 <--> S18-12)	-	-	-
R- <--> E (S19-23 <--> S18-12)	Always	10-14V	Sound from RH speaker is small.
L- <--> E (S19-24 <--> S18-12)	Always	10 - 14V	Sound from LH speaker is small.

DVD auto changer:

Fig 10: Identifying DVD Auto Changer Connector Terminals

DVD AUTO CHANGER CONNECTOR TERMINALS REFERENCE

Symbols (Terminal No.)	Condition	STD Voltage (V)	Problem symptom when open circuit is detected.
ACC <--> GND (D32-1 <--> D32-20)	Ignition switch ACC	10-14V	DVD auto changer does not operate.
TXM+ (D32-3)	AVC-LAN communication circuit	-	Audio system does not operate.
CDR+ (D32-5)	-	-	Sound from right side speaker is small.
CDL+ (D32-6)	-	-	Sound from left side speaker is small.
NTSC (D32-9)	-	-	DVD auto changer does not displayed.
+B <--> GND (D32-10 <--> D32-20)	Always	10-14V	DVD auto changer does not operate.
MUTE <--> GND (D32-1 1 <--> D32-20)	DISC switch ON	5-7V	Pop sound etc.
			Speaker does not sound
TXM-(D32-13)	AVC-LAN communication circuit	-	Audio system does not operate.
CDR-(D32-15)	-	-	Sound from right side speaker is small.
CDL-(D32-16)	-	-	Sound from left side speaker is small.

Gateway ECU:

Fig 11: Identifying Gateway ECU Terminals

GATEWAY ECU TERMINALS REFERENCE

Symbols (Terminals No.)	Wiring Color	Condition	STD Voltage (V)
IG <--> GND (G5-2 <--> G5-14	B-W <--> W-B	Ignition switch ON.	10 - 14V
MPD1 (G5-4)	B	Communication circuit (Gateway ECU and Center ECU)	-
GTX+ (G5-5)	P-L	AVC-LAN communication circuit	-
CG <--> Body ground (G5-7 <--> Body ground)	BR <--> Body ground	Always	Continuity
BATT <--> GND (G5-8 <--> G5-14)	L-W <--> W-B	Always	10 - 14V
MPD2 (G5-11)	P-B	Communication circuit (Gateway ECU and Center ECU)	-
GTX-(G5-12)	P-B	AVC-LAN communication circuit	-
GND <--> Body ground (G5-14 <--> Body ground)	W-B <--> Body ground	Always	Continuity