Terminals Of Ecu

WARNING: This page is about a different car, the 2008 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

CHECK NAVIGATION RECEIVER ASSEMBLY

Fig 1: Identifying ECU Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the I20 navigation receiver assembly connector.

Measure the resistance and voltage according to the value(s) in the table below.

TERMINAL DESCRIPTION

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
I20-1 (B) - I20-20 (GND)	L-W-B	Battery	Always	11 to 14 V
I20-20 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
I20-11 (ACC) - I20-20 (GND)	GR - W-B	ACC power supply	Ignition switch off	Below 1 V
I20-11 (ACC) - I20-20 (GND)	GR - W-B	ACC power supply	Ignition switch ACC	11 to 14 V

If the result is not as specified, there may be a malfunction on the wire harness side.

Reconnect the I20 navigation receiver assembly connector.

Measure the voltage according to the value(s) in the table below.

TERMINAL DESCRIPTION

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
I5-1 (VV+) - I20-20 (GND)*	BR - W-B	Display signal (input)	RSE system is sounding	Pulse generation
I5-2 (VAR+) - I20-20 (GND)	R - W-B	Aux sound signal (right)	External device is playing (When stereo jack is used)	Waveform synchronized with sound is output
I5-3 (VAL+) - I20-20 (GND)	B - W-B	Aux sound signal (left)	External device is playing (When stereo jack is used)	Waveform synchronized with sound is output
I5-4 (VV-) - I20-20 (GND)*	Y - W-B	Ground	Always	Below 1 V
I5-5 (VA-) - I20-20 (GND)	W-W-B	Shielded ground	Always	Below 1 V
I5-6 (ADPG) - I20-20 (GND)	SB - W-B	External device connection detection signal	External device is connection	Below 1 V
I6-1 (PKB) - I20-20 (GND)*	R - W-B	Parking brake signal	See "Vehicle Signal Check" Mode (See SYSTEM NORMAL CONDITION CHECK )	-
I6-3 (SPD) - I20-20 (GND)	W - W-B	Speed signal from combination meter	See "Vehicle Signal Check" mode (See SYSTEM NORMAL CONDITION CHECK )	-
I6-5 (REV) - I20-20 (GND)	G - W-B	Reverse signal	See "Vehicle Signal Check" mode (See SYSTEM NORMAL CONDITION CHECK )	-
I7-12 (TSW-) - I20-20 (GND)	W-B - W-B	Telephone related switch ground	Always	Below 1 V
I7-17 (MACC) - I20-20 (GND)	LG - W-B	Microphone amplifier power supply	Ignition switch ACC	4 to 6 V
I7-18 (SGND) - I20-20 (GND)	W-B - W-B	Telephone related switch ground	Always	Below 1 V
I7-19 (MIC+) - I20-20 (GND)	BR - W-B	Microphone voice signal	See "Microphone & Voice Recognition Check" (See NAVIGATION CHECK MODE )	-
I7-20 (MIC-) - I20-20 (GND)	Y - W-B	Microphone voice signal	See "Microphone & Voice Recognition Check" (See NAVIGATION CHECK MODE )	-
I7-21 (CGND) - I20-20 (GND)	W - W-B	Television camera signal ground	Always	Below 1 V
I7-22 (V+) - I20-20 (GND)	R - W-B	Television camera image signal	Ignition switch ON, shift lever in R	Pulse generation (refer to e waveform)
I7-23 (V-) - I20-20 (GND)	Shielded - W-B	Shielded ground	Always	Below 1 V
I7-24 (CA+) - I20-20 (GND)	B - W-B	Television camera power supply	Ignition switch ON, shift lever in R	5.5 to 7.05 V
I8-1 (CSLD) - I20-20 (GND)*	Shielded - W-B	Shielded ground	Always	Below 1 V
I8-2 (CDR+) - I20-20 (GND)*	B - W-B	Right channel sound signal from RSE system	RSE system is playing	Waveform synchronized with sound is output
I8-3 (CDR-) - I20-20 (GND)*	G - W-B	Right channel sound signal from RSE system	RSE system is playing	Waveform synchronized with sound is output
I8-4 (CDL+) - I20-20 (GND)*	R - W-B	Left channel sound signal from RSE system	RSE system is playing	Waveform synchronized with sound is output
I8-5 (CDL-) - I20-20 (GND)*	W - W-B	Left channel sound signal from RSE system	RSE system is playing	Waveform synchronized with sound is output
I8-6 (MUTE) - I20-20 (GND)*	O- W-B	Mute signal	RSE system is playing → changing mode	3.5 V or higher → Below 1 V
I8-9 (TXM+) - I20-20 (GND)*	G - W-B	AVC-LAN communication signal	Ignition switch ACC	2 to 3 V
I8-10 (TXM-) - I20-20 (GND)*	R - W-B	AVC-LAN communication signal	Ignition switch ACC	2 to 3 V
I20-2 (ILL+) - I20-20 (GND)	SB - W-B	Illumination signal	Light control switch OFF	Below 1 V
I20-2 (ILL+) - I20-20 (GND)	SB - W-B	Illumination signal	Light control switch TAIL or HEAD	11 to 14 V
I20-5 (ATX+) - I20-20 (GND)	V - W-B	AVC-LAN communication signal	Ignition switch ACC	2 to 3 V
I20-7 (MUTE) - I20-20 (GND)	GR - W-B	Mute signal	Audio system playing → changing modes	3.5 or higher → Below 1 V
I20-8 (R+) - I20-20 (GND)	W - W-B	Sound signal (right)	Audio system is playing	Waveform synchronized with sound is output
I20-9 (L+) - I20-20 (GND)	G - W-B	Sound signal (left)	Audio system is playing	Waveform synchronized with sound is output
I20-10 (SLD) - I20-20 (GND)	Shielded - W-B	Shielded	Always	Below 1 V
I20-12 (ILL-) - I20-20 (GND)	O - W-B	Illumination signal	Light control switch OFF	Below 1 V
I20-12 (ILL-) - I20-20 (GND)	O - W-B	Illumination signal	Light control switch TAIL or HEAD	11 to 14 V
I20-13 (ALT) - I20-20 (GND)	W - W-B	Power source of antenna	Radio switch ON (AM or FM)	11 to 14 V
I20-15 (ATX-) - I20-20 (GND)	P - W-B	AVC-LAN communication signal	Ignition switch ACC	2 to 3 V
I20-18 (R-) - I20-20 (GND)	R - W-B	Sound signal (right)	Audio system is playing	Waveform synchronized with sound is output
I20-19 (L-) - I20-20 (GND)	B - W-B	Sound signal (left)	Audio system is playing	Waveform synchronized with sound is output
I3-6 (SWG) - I20-20 (GND)	BR - W-B	Steering pad switch signal	Always	Below 1 V
I3-7 (SW1) - I20-20 (GND)	LG - W-B	Steering pad switch signal	Steering switch not pushed	4 to 6 V
			Steering switch Seek+ switch pushed	Approx. 0.5 V
			Steering switch Seek-switch pushed	Approx. 0.9 V
			Steering switch Volume+ switch pushed	Approx. 2.0 V
			Steering switch Volume-switch pushed	Approx. 3.4 V
I3-8 (SW2) - I20-20 (GND)	GR - W-B	Steering pad switch signal	Steering switch not pushed	4 to 6 V
			Steering switch MODE pushed	Approx. 0.5 V
			Steering switch On Hook pushed	Approx. 0.9 V
			Steering switch Off Hook pushed	Approx. 2.0 V
			Steering switch Voice pushed	Approx. 3.4 V
I3-11 (IVO+) - I20-20 (GND)	Y - W-B	Voice guidance signal	Voice guidance is provided	Waveform synchronized with sounds is output
I3-12 (IVO-) - I20-20 (GND)	BR - W-B	Voice guidance signal	Voice guidance is provided	Waveform synchronized with sounds is output
I3-13 (SLD1) - I20-20 (GND)	Shielded - W-B	Shielded ground	Always	Below 1 V
I3-15 (ARI) - I20-20 (GND)	R - W-B	Sound signal (Right)	External device is playing (When stereo jack is used)	A waveform synchronized with sounds is output
I3-16 (ASGN) - I20-20 (GND)	W - W-B	Ground	Always	Below 1 V
I3-17 (ALI) - I20-20 (GND)	B - W-B	Sound signal (Left)	External device is playing (When stereo jack is used)	A waveform synchronized with sounds is output
I3-18 (AUXG) - I20-20 (GND)	Shielded - W-B	Shield ground	Always	Below 1 V
I3-19 (AUXI) - I20-20 (GND)	SB - W-B	External device connection detection signal	External device is connected	Below 1 V
HINT: *: w/ Rear Seat Entertainment System If the result is not as specified, the receiver may have a malfunction.

Using an oscilloscope, check the waveform.

Waveform (reference)

WAVEFORM REFERENCE

Item	Content
Terminal Connection	I7-22 (V+) - I20-20 (GND)
Tester Range	0.2 V/DIV., 0.2 μs/DIV.
Vehicle Condition	Ignition switch ON, shift lever in R

CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY (See TERMINALS OF ECU )

Fig 2: Identifying Waveform
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002