Terminals Of Ecu

Fig 1: Identifying K46 Display Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the K46 display connector.
2. Measure the resistance and voltage of the wire harness side connector.
   CONNECTOR TERMINAL REFERENCE
   
   

   Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
   +B1 (K46-1) - GND1 (K46-10)	O - W-B	Battery	Always	10 to 14 V
   ACC (K46-2) - GND1 (K46-10)	GR - W-B	Accessory (ON)	Power switch OFF	Below 1 V
   ACC (K46-2) - GND1 (K46-10)	GR - W-B	Accessory (ON)	Power switch ON (ACC or IG)	10 to 14 V
   IG (K46-3) - GND1 (K46-10)	B - W-B	Ignition (ON)	Power switch OFF	Below 1 V
   IG (K46-3) - GND1 (K46-10)	B - W-B	Ignition (ON)	Power switch ON (IG)	10 to 14 V
   GND1 (K46-10) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

3. Reconnect the K46 display connector.
4. Measure the voltage of the connector.
   CONNECTOR TERMINAL REFERENCE
   
   

   Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
   TC (K46-7) - GND1 (K46-10)	BR - W-B	Diagnosis ON signal	Power switch ON (IG)	9 to 14 V
   ILL- (K46-11) - GND1 (K46-10)	L - W-B	Illumination signal	Light control switch OFF	Below 1 V
   ILL- (K46-11) - GND1 (K46-10)	L - W-B	Illumination signal	Light control switch ON	10 to 14 V
   ILL+ (K46-12) - GND1 (K46-10)	G - W-B	Illumination signal	Light control switch OFF	Below 1 V
   ILL+ (K46-12) - GND1 (K46-10)	G - W-B	Illumination signal	Light control switch ON	10 to 14 V
   REV (K46-13) - GND1 (K46-10)	R - W-B	Reverse signal	See  6"Vehicle Signal Check" Mode	-
   SPD (K46-14) - GND1 (K46-10)	V - W-B	Speed signal from combination meter	See  6"Vehicle Signal Check" Mode	-
   PKB (K46-23) - GND1 (K46-10)	Y - W-B	Parking brake signal	See  6"Vehicle Signal Check" Mode	-
   TX- (K47-1) - TX+ (K47-2)	LG-L	AVC-LAN communication signal	Power switch ON (ACC)	2 to 3 V
   TSW- (K47-5) - GND1 (K46-10)	W-B - W-B	Telephone relation switch signal	Always	Below 1 V
   MACC (K47-9) - GND1 (K46-10) (*2)	O - W-B	Microphone amplifier power supply	Power switch OFF	Below 1 V
   MACC (K47-9) - GND1 (K46-10) (*2)	O - W-B	Microphone amplifier power supply	Power switch ON (IG)	5V
   MIN- (K47-10) - GND1 (K46-10)	R (*2), W (*3) - W-B	Microphone voice signal	See  8"Microphone & Voice Recognition Check"	-
   MIN+ (K47-11) - GND1 (K46-10)	G (*2), B (*3) - W-B	Microphone voice signal	See  8"Microphone & Voice Recognition Check"	-
   SGND (K47-12) - GND1 (K46-10)	W-B - W-B	Signal ground	Always	Below 1 V
   CA+ (K47-13) - GND1 (K46-10)	B - W-B	Television camera power supply	Power switch ON (IG), shift lever in reverse position	Approx. 6 V
   CGND (K47-14) - Body ground	W - Body ground	Ground	Always	Below 1 V
   IVO- (K47-21) - GND1 (K46-10)	BR - W-B	Voice guidance signal	Voice guidance is provided	Waveform synchronized with sounds is output
   IVO+ (K47-22) - GND1 (K46-10)	Y - W-B	Voice guidance signal	Voice guidance is provided	Waveform synchronized with sounds is output
   SLD (K47-23) - GND1 (K46-10)	Shielded - W-B	Shielded ground	Always	Below 1 V
   V+ (K47-27) - CGND (K47-14)	R-W	Television camera image signal	Power switch ON (IG), shift lever in reverse position	Pulse generation (refer to WAVEFORM REFERENCE waveform 1)
   V- (K47-28) - CGND (K47-14)	Shielded - W	Shielded ground	Always	Below 1 V
   VV+ (z17-1) - GND1 (K46-10) H)	W - W-B	DVD image signal	DVD is played on radio receiver	Pulse generation (refer to WAVEFORM REFERENCE waveform 2)
   W- (z17-4) - GND1 (K46-10) (M)	B - W-B	Signal ground	Always	Below 1 V
   TX- (h1-1) - TX+ (h1-2)	W-B - W-B	AVC-LAN communication signal	Power switch ON (ACC)	2 to 3 V
   MSLD (h1-3) - GND (h1-6)	Shielded - B	Shielded ground	Always	Below 1 V
   MIC- (h1-4) - GND (h1-6)	L-B	Microphone voice signal	See  8"Microphone & Voice Recognition Check"	-
   MIC+ (h1-5) - GND (h1-6)	R-B	Microphone voice signal	See  8"Microphone & Voice Recognition Check"	-
   GND (h1-6) - Body ground	B - Body ground	Ground	Always	Below 1 V
   ADET (h1-7) - GND (h1-6)	O-B	Accessory (ON)	Power switch OFF	Below 1 V
   ADET (h1-7) - GND (h1-6)	O-B	Accessory (ON)	Power switch ON (ACC)	10 to 14 V
   +B (h1-8) - GND (h1-6)	R-B	Battery	Always	10 to 14 V
   IVI- (h1-10) - GND (h1-6)	L-B	Voice guidance signal	Voice guidance is provided	Waveform synchronized with sounds is input
   IVI+ (h1-11) - GND (h1-6)	R-B	Voice guidance signal	Voice guidance is provided	Waveform synchronized with sounds is input
   REV (h1-15) - GND (h1-6)	GR-B	Reverse signal	See  4"Vehicle Sensors" Mode	-
   SPD (h1-16) - GND (h1-6)	W-B	Speed signal	See  4"Vehicle Sensors" Mode	-
   GVIF (h2-1) - GND (h1-6)	B-B	Digital image signal	Navigation display ON	Pulse generation
   HINT: *1: for DVD changer models *2: w/o LEXUS Link System *3: w/LEXUS Link System

   If the result is not as specified, the multi-display may have a malfunction.

5. Using an oscilloscope, check the waveform 1.

   Waveform 1 (reference) 

   WAVEFORM REFERENCE
   
   

   Item	Content
   Symbols (Terminal No.)	V+ (K47-27) - CGND (K47-14)
   Tool setting	0.2 V/DIV., 0.2 μs/DIV.
   Condition	Power switch ON (IG), shift lever in reverse position

   Fig 2: Waveform Graph 1

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Using an oscilloscope, check the waveform 2.

   Waveform 2 (reference) 

   WAVEFORM REFERENCE
   
   

   Item	Content
   Symbols (Terminal No.)	VV+ (z17-1) - GND1 (K46-10)
   Tool setting	0.2 V/DIV., 0.2 μs/DIV.
   Condition	Disc is played on multi-display

   Fig 3: Waveform Graph 2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Identifying Navigation ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

If the result is not as specified, the navigation ECU may have a malfunction.