Terminals Of Ecu

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

CHECK NAVIGATION RECEIVER

Fig 1: Identifying Connector Terminals Of ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the K18 receiver connector.

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

NAVIGATION RECEIVER RESISTANCE AND VOLTAGE

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
K18-20 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
K18-1 (B) - K18-20 (GND)	L - W-B	Battery	Always	11 to 14 V
K18-11 (ACC) - K18-20 (GND)	GR - W-B	ACC power supply	Ignition switch OFF	Below 1 V
K18-11 (ACC) - K18-20 (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 K18 receiver connector.

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

NAVIGATION RECEIVER VOLTAGE

Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
K18-2 (ILL+) - K18-20 (GND)	SB - W-B	Illumination signal	Light control switch OFF	Below 1 V
K18-2 (ILL+) - K18-20 (GND)	SB - W-B	Illumination signal	Light control switch TAIL or HEAD	11 to 14 V
K18-12(ILL-) - K18-20 (GND)	O - W-B	Illumination signal	Light control switch OFF	Below 1 V
K18-12(ILL-) - K18-20 (GND)	O - W-B	Illumination signal	Light control switch TAIL or HEAD	11 to 14 V
K18-15 (ATX-) - K18-20 (GND)	P - W-B	AVC-LAN communication signal	Ignition switch ACC	2 to 3V
K18-5 (ATX+) - K18-20 (GND)	V - W-B	AVC-LAN communication signal	Ignition switch ACC	2 to 3V
K21-13(SLD1) - K18-20 (GND)	Shielded - W-B	Shielded ground	Always	Below 1 V
K21-12(IVO-) - K18-20 (GND)	BR - W-B	Voice guidance signal	Voice guidance is provided	Waveform synchronized with sounds is output
K21-11 (IVO+) - K18-20 (GND)	Y - W-B	Voice guidance signal	Voice guidance is provided	Waveform synchronized with sounds is output
K18-7 (MUTE) - K18-20 (GND)	GR - W-B	Mute signal	Audio system playing → changing modes	3.5 or higher → Below 1 V
K18-10(SLD) - K18-20 (GND)	Shielded - W-B	Shielded	Always	Below 1 V
K18-8 (R+) - K18-20 (GND)	W - W-B	Sound signal (right)	Audio system is playing	Waveform synchronized with sound is output
K18-18(R-) - K18-20 (GND)	R - W-B	Sound signal (right)	Audio system is playing	Waveform synchronized with sound is output
K18-9 (L+) - K18-20 (GND)	G - W-B	Sound signal (left)	Audio system is playing	Waveform synchronized with sound is output
K18-19(L-) - K18-20 (GND)	B - W-B	Sound signal (left)	Audio system is playing	Waveform synchronized with sound is output
K6-3(SPD) - K18-20 (GND)	W - W-B	Speed signal from combination meter	See "Vehicle Signal Check" mode (see DISPLAY CHECK MODE )	-
K7-12(TSW-) - K18-20 (GND)	W-B - W-B	Telephone related switch ground	Always	Below 1 V
K7-18(SGND) - K18-20 (GND)	W-B - W-B	Telephone related switch ground	Always	Below 1 V
K6-5 (REV) - K18-20 (GND)	G - W-B	Reverse signal	See "Vehicle Signal Check" mode (see DISPLAY CHECK MODE )	-
K5-3(VAL+) - K18-20 (GND)	B - W-B	Aux sound signal (left)	External device is playing (When stereo jack is used)	Waveform synchronized with sound is output
K5-2 (VAR+) - K18-20 (GND)	R - W-B	Aux sound signal (right)	External device is playing (When stereo jack is used)	Waveform synchronized with sound is output
K5-5(VA-) - K18-20 (GND)	W - W-B	Shielded ground	Always	Below 1 V
K5-6(ADPG) - K18-20 (GND)	SB - W-B	External device connection detection signal	External device is connection	Below 1 V
K21-7(SW1) - K18-20 (GND)	LG - W-B	Steering pad switch signal	Steering switch not pushed	4 to 6V
K21-7(SW1) - K18-20 (GND)	LG - W-B	Steering pad switch signal	Steering switch Seek+ switch pushed	Approx. 0.5 V
K21-7(SW1) - K18-20 (GND)	LG - W-B	Steering pad switch signal	Steering switch Seek-switch pushed	Approx. 0.9 V
K21-7(SW1) - K18-20 (GND)	LG - W-B	Steering pad switch signal	Steering switch Volume+ switch pushed	Approx. 2.0 V
K21-7(SW1) - K18-20 (GND)	LG - W-B	Steering pad switch signal	Steering switch Volume-switch pushed	Approx. 3.4 V
K21-6(SWG) - K18-20 (GND)	BR - W-B	Steering pad switch signal	Always	Below 1 V
K21-8(SW2) - K18-20 (GND)	GR - W-B	Steering pad switch signal	Steering switch not pushed	4 to 6V
K21-8 (SW2) - K18-20 (GND)	GR - W-B	Steering pad switch signal	Steering switch MODE pushed	Approx. 0.5 V
K21-8(SW2) - K18-20 (GND)	GR - W-B	Steering pad switch signal	Steering switch On Hook pushed	Approx. 0.9 V
K21-8(SW2) - K18-20 (GND)	GR - W-B	Steering pad switch signal	Steering switch Off Hook pushed	Approx. 2.0 V
K21-8(SW2) - K18-20 (GND)	GR - W-B	Steering pad switch signal	Steering switch Voice pushed	Approx. 3.4 V
K7-24(CA+) - K18-20 (GND)	B - W-B	Television camera power supply	Ignition switch ON, shift lever R position	5.5 to 7.05 V
K7-21 (CGND) - K18-20 (GND)	W - W-B	Television camera signal ground	Always	Below 1 V
K7-22(V+) - K18-20 (GND)	R - W-B	Television camera image signal	Ignition switch ON, shift lever R position	Pulse generation (refer to WAVEFORM )
K7-23(V-) - K18-20 (GND)	Shielded - W-B	Shielded ground	Always	Below 1 V
K7-17(MACC) - K18-20 (GND)	LG - W-B	Microphone amplifier power supply	Ignition switch ACC	4 to 6V
K7-19(MIC+) - K18-20 (GND)	BR - W-B	Microphone voice signal	See "Microphone & Voice Recognition Check" (see NAVIGATION CHECK MODE )	-
K7-20(MIC-) - K18-20 (GND)	Y - W-B	Microphone voice signal	See "Microphone & Voice Recognition Check" (see NAVIGATION CHECK MODE )	-
K5-1 (VV+) - K18-20 (GND)*	BR - W-B	Display signal (input)	RSE system is sounding	Pulse generation
K5-4(VV-) - K18-20 (GND)*	Y - W-B	Ground	Always	Below 1V
K6-1 (PKB) - K18-20 (GND)*	R - W-B	Parking brake signal	See "Vehicle Signal Check" Mode (see DISPLAY CHECK MODE )	-
K8-1 (CSLD) - K18-20 (GND)*	Shielded - W-B	Shielded ground	Always	Below 1V
K8-2(CDR+) - K18-20 (GND)*	B - W-B	Right channel sound signal from RSE system	RSE system is playing	Waveform synchronized with sound is output
K8-3(CDR-) - K18-20 (GND)*	G - W-B	Right channel sound signal from RSE system	RSE system is playing	Waveform synchronized with sound is output
K8-4 (CDL+) - K18-20 (GND)*	R - W-B	Left channel sound signal from RSE system	RSE system is playing	Waveform synchronized with sound is output
K8-5(CDL-) - K18-20 (GND)*	W - W-B	Left channel sound signal from RSE system	RSE system is playing	Waveform synchronized with sound is output
K8-6 (MUTE) -K18-20 (GND)*	O - W-B	Mute signal	RSE system is playing → changing mode	3.5 V or higher → Below 1 V
K8-9(TXM+) - K18-20 (GND)*	G - W-B	AVC-LAN communication signal	Ignition switch ACC	2 to 3V
K8-10(TXM-) - K18-20 (GND)*	R - W-B	AVC-LAN communication signal	Ignition switch ACC	2 to 3V
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 No. (Symbols)	K7-22 (V+) - K7-21 (CGND)
Tool Setting	0.2 V/DIV, 0.2 μs/DIV.
Condition	Ignition switch ON, shift lever R position

CHECK STEREO COMPONENT AMPLIFIER (see TERMINALS OF ECU )

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