Terminals Of Ecu

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE ROOM J/B ASSEMBLY (FRONT CONTROLLER)

Fig 1: Identifying Engine Room J/B Assembly Connector Terminal Identification (Front Controller)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
1A-1 - 1H-8	B - W-B	Battery (ALT fuse)	Always	10 to 14 V
1C-4 - 1H-8	BR - W-B	Hi-beam circuit (To headlight LH)	Hi-beam is ON	10 to 14 V
1C-4 - 1H-8	BR - W-B	Hi-beam circuit (To headlight LH)	Hi-beam is OFF	Below 1 V
1C-5 - 1H-8	G - W-B	Hi-beam circuit (To headlight RH)	Hi-beam is ON	10 to 14 V
1C-5 - 1H-8	G - W-B	Hi-beam circuit (To headlight RH)	Hi-beam is OFF	Below 1 V
1F-1 - 1H-8	B - W-B	Battery (Power source circuit)	Always	10 to 14 V (*1)
1F-1 - 1H-8	W - W-B	Battery (Power source circuit)	Always	10 to 14 V (*2)
1G-1 - Body ground	V - Body ground	Power source circuit	Always	10 to 14 V
1G-2 - Body ground	R - Body ground	Power source circuit	Always	10 to 14 V
1G-6 - 1H-8	LG - W-B	HEAD signal (Front light control switch)	Light control switch is HEAD	10 to 14 V
1G-6 - 1H-8	LG - W-B	HEAD signal (Front light control switch)	Light control switch isn't HEAD	Below 1 V
1G-7 - Body ground	Y - Body ground	Multiplex communication signal circuit	Ignition switch on (IG)	Signal waveform
1G-8 - Body ground	B - Body ground	Multiplex communication signal circuit	Ignition switch on (IG)	Signal waveform
1H-2 - Body ground	W-B - Body ground	Body ground	Always	Below 1 V
1H-3 - 1H-8	P - W-B	HEAD signal (To headlight)	Headlight (low) is ON	10 to 14 V
1H-3 - 1H-8	P - W-B	HEAD signal (To headlight)	Headlight (low) is OFF	Below 1 V
1H-8 - Body ground	W-B - Body ground	Body ground	Always	Below 1 V
1H-11 (*3) - 1H-8	GR - W-B	HEAD signal (To headlight beam level control ECU)	Headlight (low) is ON	Below 1 V
1H-11 (*3) - 1H-8	GR - W-B	HEAD signal (To headlight beam level control ECU)	Headlight (low) is OFF	10 to 14 V

*1: with Smart Key System

*2: without Smart Key System

*3: with Headlight Beam Level Control

INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (BODY ECU)

Fig 2: Identifying Instrument Panel Function Block Assembly Connector Terminal Identification (Body ECU)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
BATB (IA-1) - GND1 (IF-10)	B - W-B	Battery (Power source circuit)	Always	10 to 14 V
PKB (IC-14) - GND1 (IF-10)	LG - W-B	Parking brake switch	Parking brake is depressed	Below 1 V
PKB (IC-14) - GND1 (IF-10)	LG - W-B	Parking brake switch	Parking brake is released	10 to 14 V
BECU (ID-10) - GND1 (IF-10)	BE - W-B	Battery (B+ circuit)	Always	10 to 14 V
ALTB (ID-16) - GND1 (IF-10)	G - W-B	Battery (ALT fuse)	Always	10 to 14 V
GND1 (IF-10) - Body ground	W-B - Body ground	Body ground	Always	Below 1 V
TRNR (II-5) - GND1 (IF-10)	L - W-B	RH side turn signal (To turn signal flasher assembly)	Ignition switch on (IG) and turn signal switch (right turn) OFF	10 to 14 V
TRNR (II-5) - GND1 (IF-10)	L - W-B	RH side turn signal (To turn signal flasher assembly)	Ignition switch on (IG) and turn signal switch (right turn) ON	Below 1 V
ILE (II-10) - GND1 (IF-10)	BR (*1) - W-B	Key cylinder light (Illumination signal)	Ignition key cylinder light is OFF	10 to 14 V
ILE (II-10) - GND1 (IF-10)	BR (*1) - W-B	Key cylinder light (Illumination signal)	Ignition key cylinder light is ON	Below 1 V
TRLY (IL-3) - GND1 (IF-10)	Y (*2) - W-B	TAIL relay (TAIL signal)	Light control switch is OFF	Below 1 V
TRLY (IL-3) - GND1 (IF-10)	Y (*2) - W-B	TAIL relay (TAIL signal)	Light control switch is TAIL and fog light switch is ON	10 to 14 V
GND2 (IM-9) - GND1 (IF-10)	W - W-B	Body ground	Always	Below 1 Ω
LCTY (IO-7) - GND1 (IF-10)	B - W-B	Courtesy switch (Rear left door circuit)	Rear left door is open	Below 1 V
LCTY (IO-7) - GND1 (IF-10)	B - W-B	Courtesy switch (Rear left door circuit)	Rear left door is closed	Pulse generation (See Fig 3waveform 1)
LSWL (IP-5) - GND1 (IF-10)	GR - W-B	Door lock position switch (Rear left door circuit)	Rear left door is in the unlock position	Below 1 V
LSWL (IP-5) - GND1 (IF-10)	GR - W-B	Door lock position switch (Rear left door circuit)	Rear left door is in the lock position	Pulse generation (See Fig 3waveform 1)
ILE (IR-5) - GND1 (IF-10)	BR - W-B	Front interior illumination (Illumination signal)	Front interior light is OFF	10 to 14 V
ILE (IR-5) - GND1 (IF-10)	BR - W-B	Front interior illumination (Illumination signal)	Front interior light is ON	Below 1 V
MPX1 (IR-9) - GND1 (IF-10)	B - W-B	Multiplex communication signal	Ignition switch off	Below 1 V
MPX1 (IR-9) - GND1 (IF-10)	B - W-B	Multiplex communication signal	Ignition switch on (IG)	Signal waveform
TRNL (D9-4) - GND1 (IF-10)	R - W-B	LH side turn signal (To turn signal flasher assembly)	Ignition switch on (IG) and turn signal switch (left turn) OFF	10 to 14 V
TRNL (D9-4) - GND1 (IF-10)	R - W-B	LH side turn signal (To turn signal flasher assembly)	Ignition switch on (IG) and turn signal switch (left turn) ON	Below 1 V
FFGO (D9-7) - GND1 (IF-10)	P (*2) - W-B	Front fog relay (Front fog circuit)	Front fog light is OFF	10 to 14 V
FFGO (D9-7) - GND1 (IF-10)	P (*2) - W-B	Front fog relay (Front fog circuit)	Front fog light is ON	Below 1 V
DCYL (D8-13) - GND1 (IF-10)	SB - W-B	Courtesy light (Front left door circuit)	Front left courtesy light is OFF	10 to 14 V
DCYL (D8-13) - GND1 (IF-10)	SB - W-B	Courtesy light (Front left door circuit)	Front left courtesy light is ON	Below 1 V
DCTY (D8-14) - GND1 (IF-10)	G - W-B	Courtesy switch (Front left door circuit)	Front left door is open	Below 1 V
DCTY (D8-14) - GND1 (IF-10)	G - W-B	Courtesy switch (Front left door circuit)	Front left door is closed	10 to 14 V
RCTY (D8-16) - GND1 (IF-10)	GR - W-B	Courtesy switch (Rear right door circuit)	Rear right door is open	Below 1 V
RCTY (D8-16) - GND1 (IF-10)	GR - W-B	Courtesy switch (Rear right door circuit)	Rear right door is closed	Pulse generation (See Fig 3waveform 1)
HAZ (D7-2) - GND1 (IF-10)	P - W-B	HAZARD signal (Front hazard switch)	Hazard switch is OFF	10 to 14 V
HAZ (D7-2) - GND1 (IF-10)	P - W-B	HAZARD signal (Front hazard switch)	Hazard switch is ON	Below 1 V
CLTE (D7-4) - GND1 (IF-10)	W - W-B	Automatic light control sensor (Ground circuit)	Always	Below 1 V
CLTS (D7-5) - GND1 (IF-10)	LG - W-B	Automatic light control sensor (Signal circuit)	Ignition switch on (IG)	Below 1 V
CLTS (D7-5) - GND1 (IF-10)	LG - W-B	Automatic light control sensor (Signal circuit)	Ignition switch off	10 to 14 V
CLTB (D7-6) - GND1 (IF-10)	BR - W-B	Automatic light control sensor (Power source circuit)	Ignition switch off	10 to 14 V
CLTB (D7-6) - GND1 (IF-10)	BR - W-B	Automatic light control sensor (Power source circuit)	Ignition switch on (IG)	Below 1 V
LSWR (D6-5) - GND1 (IF-10)	B - W-B	Door lock position switch (Rear right door circuit)	Rear right door is in the unlock position	Below 1 V
LSWR (D6-5) - GND1 (IF-10)	B - W-B	Door lock position switch (Rear right door circuit)	Rear right door is in the lock position	Pulse generation (See Fig 3waveform 1)
MPX2 (D6-21) - GND1 (IF-10)	BR - W-B	Multiplex communication signal	Ignition switch off	Below 1 V
MPX2 (D6-21) - GND1 (IF-10)	BR - W-B	Multiplex communication signal	Ignition switch on (IG)	Signal waveform
PCTY (D6-23) - GND1 (IF-10)	L - W-B	Courtesy switch (Front right door circuit)	Front right door is open	Below 1 V
PCTY (D6-23) - GND1 (IF-10)	L - W-B	Courtesy switch (Front right door circuit)	Front right door is closed	10 to 14 V
PCYL (D6-24) - GND1 (IF-10)	BE - W-B	Courtesy light (Front right door circuit)	Front right courtesy light is OFF	10 to 14 V
PCYL (D6-24) - GND1 (IF-10)	BE - W-B	Courtesy light (Front right door circuit)	Front right courtesy light is ON	Below 1 V
LGCY (D6-25) - GND1 (IF-10)	V - W-B	Courtesy switch (Back door circuit)	Back door is open	Below 1 V
LGCY (D6-25) - GND1 (IF-10)	V - W-B	Courtesy switch (Back door circuit)	Back door is closed	10 to 14 V
LSWP (D6-27) - GND1 (IF-10)	GR - W-B	Door lock position switch (Front right door circuit)	Front right door is in the unlock position	Below 1 V
LSWP (D6-27) - GND1 (IF-10)	GR - W-B	Door lock position switch (Front right door circuit)	Front right door is in the lock position	10 to 14 V

*1: without Smart Key System

*2: with Front Fog Light

Waveform 1

Fig 3: Identifying Waveform 1
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:
- Gauge set:
  5 V/DIV. 5 ms/DIV.
- Condition:
  Ignition switch on (IG)

COMBINATION SWITCH ECU (WINDSHIELD WIPER SWITCH ASSEMBLY)

Fig 4: Identifying Combination Switch ECU Connector Terminal Identification (Windshield Wiper Switch Assembly)

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
B (D13-1) - E (D13-5)	P - W	Power source circuit (Front battery)	Always	10 to 14 V
IG (D13-2) - E (D13-5)	L - W	Ignition switch signal circuit (From ignition switch)	Ignition switch off	Below 1 V
IG (D13-2) - E (D13-5)	L - W	Ignition switch signal circuit (From ignition switch)	Ignition switch on (IG)	10 to 14 V
HEAD (D13-4) - Body ground	LG - Body ground	Light control switch HEAD signal	Light control switch is not HEAD	10 to 14 V
HEAD (D13-4) - Body ground	LG - Body ground	Light control switch HEAD signal	Light control switch is HEAD	Below 1 V
E (D13-5) - Body ground	W - Body ground	Ground	Always	Below 1 V
MPX1 (D13-6) - Body ground	BR - Body ground	Multiplex communication signal circuit	Ignition switch on (IG)	Signal waveform
MPX2 (D13-7) - Body ground	R - Body ground	Multiplex communication signal circuit	Ignition switch on (IG)	Signal waveform (*1)
MPX2 (D13-7) - Body ground	B - Body ground	Multiplex communication signal circuit	Ignition switch on (IG)	Signal waveform (*2)

*1: with Smart Key System

*2: without Smart Key System

HEADLIGHT BEAM LEVEL CONTROL ECU

Fig 5: Identifying Headlight Beam Level Control ECU Connector Terminal Identification

Symbols (Terminal No.)	Wiring Color	Terminal Description	Condition	Specified Condition
E1 (A21-1) - Body ground	W - Body ground	Ground	Always	Below 1 V
SPDL (A21-5) - E1 (A21-1)	Y - W	Vehicle speed signal (From the skid control ECU)	Vehicle is driven at approx. 30 km/h (19 mph)	Pulse generation (See Fig 6waveform 1)
SPDR (A21-6) - E1 (A21-1)	R - W	Vehicle speed signal (From the skid control ECU)	Vehicle is driven at approx. 30 km/h (19 mph)	Pulse generation (See Fig 6waveform 1)
B2 (A21-7) - E1 (A21-1)	GR - W	HEAD relay operation signal	HEAD relay is ON	Below 1 V
B2 (A21-7) - E1 (A21-1)	GR - W	HEAD relay operation signal	HEAD relay is OFF	10 to 14 V
CHG- (A21-8) - E1 (A21-1)	Y - W	Generator signal circuit	Engine is running	10 to 14 V
CHG- (A21-8) - E1 (A21-1)	Y - W	Generator signal circuit	Engine is stopped	Below 1 V
LR2+ (A21-10) - LR2- (A21-9)	LG - W	Headlight beam level control motor RH (Operation signal circuit)	Ignition switch off	Below 1 V
LR2+ (A21-10) - LR2- (A21-9)	LG - W	Headlight beam level control motor RH (Operation signal circuit)	Engine is running, change vehicle height and keep it fro more than 1 second.	Pulse generation (See Fig 7waveform 2)
LR1+ (A21-12) - LR1- (A21-11)	B - BR	Headlight beam level control motor RH (Operation signal circuit)	Ignition switch off	Below 1 V
LR1+ (A21-12) - LR1- (A21-11)	B - BR	Headlight beam level control motor RH (Operation signal circuit)	Engine is running, change vehicle height and keep it fro more than 1 second.	Pulse generation (See Fig 7waveform 2)
IG (A21-14) - E1 (A21-1)	G - W	Power source circuit (From engine switch (IG))	Ignition switch off	Below 1 V
IG (A21-14) - E1 (A21-1)	G - W	Power source circuit (From engine switch (IG))	Ignition switch on (IG)	10 to 14 V
SGR (A21-17) - E1 (A21-1)	V - W	Height control sensor (Ground circuit)	Always	Below 1 V
INIT (A21-18) - E1 (A21-1)	W - W	Initialize signal input terminal	Ignition switch off	Below 1 V
INIT (A21-18) - E1 (A21-1)	W - W	Initialize signal input terminal	Ignition switch on (IG)	Approx. 5.0 V
SHRL (A21-19) - E1 (A21-1)	L - W	Height control sensor (Signal circuit)	Ignition switch off	Below 1 V
SHRL (A21-19) - E1 (A21-1)	L - W	Height control sensor (Signal circuit)	Ignition switch on (IG)	0.5 to 4.5 V
SBR (A21-21) - E1 (A21-1)	B - W	Height control sensor (Power source circuit)	Ignition switch off	Below 1 V
SBR (A21-21) - E1 (A21-1)	B - W	Height control sensor (Power source circuit)	Ignition switch on (IG)	Approx. 5.0 V
WNG (A21-26) - E1 (A21-1)	V - W	Headlight beam level warning indicator signal (To combination meter)	Headlight beam level warning indicator comes on	Below 1 V
WNG (A21-26) - E1 (A21-1)	V - W	Headlight beam level warning indicator signal (To combination meter)	Headlight beam level warning indicator goes off	10 to 14 V
LL2+ (A21-29) - LL2- (A21-28)	P - R	Headlight beam level control motor LH (Operation signal circuit)	Ignition switch off	Below 1 V
LL2+ (A21-29) - LL2- (A21-28)	P - R	Headlight beam level control motor LH (Operation signal circuit)	With the ignition switch on (IG), change vehicle height and keep it for more than 1 second.	Pulse generation (See Fig 7waveform 2)
LL1+ (A21-31) - LL1- (A21-30)	L-B - BE	Headlight beam level control motor LH (Operation signal circuit)	Ignition switch off	Below 1 V
LL1+ (A21-31) - LL1- (A21-30)	L-B - BE	Headlight beam level control motor LH (Operation signal circuit)	With the ignition switch on (IG), change vehicle height and keep it for more than 1 second.	Pulse generation (See Fig 7waveform 2)

Waveform 1

Fig 6: Identifying Waveform 1
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:
- Terminal:
  SPDR - GND
  
  SPDR - GND
- Gauge set:
  5 V/DIV. 2 ms/DIV.
- Condition:
  Vehicle is driven at approximately 30 km/h (19 mph).
Waveform 2

Fig 7: Identifying Waveform Graph 2
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:
- Terminal:
  LL1+ - LL1-
  
  LL2+ - LL2-
  
  LR1+ - LR1-
  
  LR2+ - LR2-
- Gauge set:
  10 V/DIV. 5 ms/DIV.
- Condition:
  The light control switch is in the HEAD position when the vehicle is standing still or bouncing.