Terminals Of Ecu [08/2021 - ]

Fig 1: Instrument Panel Junction Block Assembly And Main Body ECU (Multiplex Network Body ECU) Connector End View

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
2. Measure the voltage and resistance according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   3D-3 - Body ground	LA - Body ground	Ground	Always	Below 1 Ω
   3F-1 - Body ground	LG - Body ground	Battery power supply	Always	11 to 14 V
   3K-1 - Body ground	B - Body ground	Battery power supply	Always	11 to 14 V

3. Connect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
4. Measure the voltage and resistance, and check for pulses according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   3A-40 - Body ground	LA-G - Body ground	BKUP LP relay drive output	Engine switch off	Below 1 V
   			Engine switch on (ACC)	11 to 14 V
   3F-19 - Body ground	BE - Body ground	BKUP LP relay drive output	Engine switch off, reverse (R) not selected	Below 1 V
   			Engine switch on (IG), reverse (R) selected	11 to 14 V
   3F-23 - Body ground	L - Body ground	BKUP LP relay drive output	Engine switch off	Below 1 V
   			Engine switch on (IG)	11 to 14 V
   3F-31 - Body ground	V - Body ground	H-LP LH relay drive output	Engine switch on (IG) or within 15 seconds after engine switch turned off Taillights on	Below 1 V
   			15 seconds or more after engine switch turned off Taillights off	11 to 14 V
   3H-10 - Body ground	LG - Body ground	Back-up lights drive output	Engine switch off, reverse (R) not selected	Below 1 V
   			Engine switch on (IG), reverse (R) selected	11 to 14 V
   3H-30 - Body ground	B - Body ground	Taillights, rear side marker lights and license plate lights drive output	Taillights on	11 to 14 V
   			Taillights off	Below 1 V
   G36-19 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   G37-12 (HRY2) - Body ground	BE - Body ground	H-LP RH relay drive output	Engine switch on (IG) or within 15 seconds after engine switch turned off Taillights on	Below 1 V
   			15 seconds or more after engine switch turned off Taillights off	11 to 14 V
   G37-16 (HEAD) - Body ground	LG - Body ground	Light control switch head position input	Light control switch in head position	Below 1 V
   			Light control switch not in head position	11 to 14 V
   G37-23 (CLTB) - G37-25 (CLTE)	L - GR	Automatic light control sensor power supply output	Engine switch off	Below 1 V
   			Engine switch on (IG)	11 to 14 V
   G37-24 (CLTS) - Body ground	LG - Body ground	Automatic light control sensor signal input	Engine switch off	Below 1 V
   			Engine switch on (IG)	Pulse generation (See waveform 1)
   G38-2 (MILE) - Body ground	B - Body ground	Outside handle foot lights drive output	Outside handle foot light illuminates	11 to 14 V
   			Outside handle foot light off	Below 3 V

   1. Waveform 1
      Fig 2: Waveform 1

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Item	Content
      Tester Connection	G37-24 (CLTS) - Body ground
      Tool setting	2 V/DIV., 10 ms./DIV.
      Condition	Engine switch on (IG)

      HINT: 

      The communication waveform changes according to the surrounding brightness.

Fig 3: A78 Headlight ECU Sub-Assembly LH Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the A78 headlight ECU sub-assembly LH connector.
2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A78-4 (IG) - Body ground	B - Body ground	Ignition power supply	Engine switch off	Below 1 V
   			Engine switch on (IG)	11 to 14 V
   A78-12 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   A78-13 (ECUB) - Body ground	B - Body ground	Battery power supply	15 seconds or more after engine switch turned off Taillights off	Below 1 V
   			Engine switch on (IG) or within 15 seconds after engine switch turned off Taillights on	9.5 to 14 V

3. Connect the A78 headlight ECU sub-assembly LH connector.

   HINT: 

   • Since the A78 headlight ECU sub-assembly LH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
   • Since the B and C headlight ECU sub-assembly LH connectors are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.
4. Measure the voltage and check of pulses according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A78-11 (TNS) - Body ground	LG - Body ground	Front turn signal light signal input	Engine switch on (IG), front turn signal light off	Below 1 V
   			Engine switch on (IG), front turn signal light blinking	11 to 14 V ←→ Below 1 V
   A78-16 (SBR) - A78-15 (SGR)	LG - G	Rear height control sensor sub-assembly LH power supply	Engine switch on (IG)	4.75 to 5.25 V
   A78-17 (SHRL) - A78-15 (SGR)	BE - G	Rear height control sensor sub-assembly LH signal input	Engine switch on (IG), vehicle unloaded, vehicle stopped	Approximately 2.5 V (value decreases as the front of the vehicle is raised)
   A78-20 (LINL) - Body ground	W - Body ground	LIN communication line	Engine switch off	Below 1 V
   			Engine switch on (IG)	Pulse generation
   A78-23 (CANL) - Body ground	W - Body ground	CAN communication line	Engine switch off	Below 1 V
   			Engine switch on (IG)	Pulse generation
   A78-24 (CANH) - Body ground	R - Body ground	CAN communication line	Engine switch off	Below 1 V
   			Engine switch on (IG)	Pulse generation
   B-2 (LOLED2) - B-3 (LOLED1)	-	Low beam headlights drive output	Low beam headlights off	Below 1 V
   			Low beam headlights on	21.4 to 30.45 V
   B-4 (FANB) - B-14 (FANG)	-	Headlight fan power source	Low beam headlights off	Below 1 V
   			Low beam headlights on	4.75 to 5.25 V
   B-6 (HILED2) - B-5 (HILED1)	-	Cornering lights drive output	Cornering lights off	Below 1 V
   			Cornering lights on	6.1 to 8.6 V
   B-9 (ACTBI) - B-17 (ACTGI)	-	Headlight leveling motor power source	Engine switch off	Below 1 V
   			Engine switch on (IG)	11 to 14 V
   B-10 (DRL/CLL+) - B-1 (DRL/CLL-)	-	Parking lights/daytime running lights power source	Parking lights and daytime running lights off	Below 1 V
   			Parking lights and daytime running lights on	11 to 14 V
   B-15 (FANP) - B-14 (FANG)	-	Headlight fan control signal input	Low beam headlights off	Below 1 V
   			Low beam headlights on	Pulse generation
   B-16 (PWM1) - B-1 (DRL/CLL-)	-	Parking lights/daytime running lights control signal output	Parking lights and daytime running lights off	Below 1 V
   			Parking lights and daytime running lights on	Pulse generation
   B-18 (FSML+) - B-12 (FSML-)	-	Front side marker lights drive output	Front side marker lights off	Below 1 V
   			Front side marker lights on	11 to 14 V
   B-19 (HI_SOL+) - B-11 (HI_SOL-)	-	High beam headlights drive output	High beam headlights off	Below 1 V
   			High beam headlights on	11 to 14 V
   B-20 (TURN+) - B-13 (TURN-)	-	Front turn signal light signal output	Engine switch on (IG), front turn signal light off	Below 1 V
   			Engine switch on (IG), front turn signal light blinking	11 to 14 V ←→ Below 1 V
   C-13 (LINLI) - Body ground	-	LIN communication line	Engine switch off	Below 1 V
   			Engine switch on (IG)	Pulse generation

Fig 4: A78 headlight ECU Sub-Assembly LH Connector.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the A78 headlight ECU sub-assembly LH connector.
2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A78-4 (IG) - Body ground	B - Body ground	Ignition power supply	Engine switch off	Below 1 V
   			Engine switch on (IG)	11 to 14 V
   A78-12 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   A78-13 (ECUB) - Body ground	B - Body ground	Battery power supply	15 seconds or more after engine switch turned off Taillights off	Below 1 V
   			Engine switch on (IG) or within 15 seconds after engine switch turned off Taillights on	9.5 to 14 V

3. Connect the A78 headlight ECU sub-assembly LH connector.

   HINT: 

   • Since the A78 headlight ECU sub-assembly LH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
   • Since the B headlight ECU sub-assembly LH connector are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.
4. Measure the voltage and check of pulses according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A78-11 (TNS) - Body ground	LG - Body ground	Front turn signal light signal input	Engine switch on (IG), front turn signal light off	Below 1 V
   			Engine switch on (IG), front turn signal light blinking	11 to 14 V ←→ Below 1 V
   A78-23 (CANL) - Body ground	W - Body ground	CAN communication line	Engine switch off	Below 1 V
   			Engine switch on (IG)	Pulse generation
   A78-24 (CANH) - Body ground	R - Body ground	CAN communication line	Engine switch off	Below 1 V
   			Engine switch on (IG)	Pulse generation
   B-2 (LOLED2) - B-3 (LOLED1)	-	Low beam headlights drive output	Low beam headlights off	Below 1 V
   			Low beam headlights on	13.37 to 19.04 V
   B-6 (HILED2) - B-5 (HILED1)	-	Cornering lights drive output	Cornering lights off	Below 1 V
   			Cornering lights on	7.99 to 11.8 V
   B-10 (DRL/CLL+) - B-1 (DRL/CLL-)	-	Parking lights/daytime running lights power source	Parking lights and daytime running lights off	Below 1 V
   			Parking lights and daytime running lights on	11 to 14 V
   B-16 (PWM1) - B-1 (DRL/CLL-)	-	Parking lights/daytime running lights control signal output	Parking lights and daytime running lights off	Below 1 V
   			Parking lights and daytime running lights on	Pulse generation
   B-18 (FSML+) - B-12 (FSML-)	-	Front side marker lights drive output	Front side marker lights off	Below 1 V
   			Front side marker lights on	11 to 14 V
   B-19 (HI_SOL+) - B-11 (HI_SOL-)	-	High beam headlights drive output	High beam headlights off	Below 1 V
   			High beam headlights on	11 to 14 V
   B-20 (TURN+) - B-13 (TURN-)	-	Front turn signal light signal output	Engine switch on (IG), front turn signal light off	Below 1 V
   			Engine switch on (IG), front turn signal light blinking	11 to 14 V ←→ Below 1 V

Fig 5: A79 Headlight ECU Sub-Assembly RH Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the A79 headlight ECU sub-assembly RH connector.
2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A79-4 (IG) - Body ground	B - Body ground	Ignition power supply	Engine switch off	Below 1 V
   			Engine switch on (IG)	11 to 14 V
   A79-12 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   A79-13 (ECUB) - Body ground	R - Body ground	Battery power supply	15 seconds or more after engine switch turned off Taillights off	Below 1 V
   			Engine switch on (IG) or within 15 seconds after engine switch turned off Taillights on	9.5 to 14 V

3. Connect the A79 headlight ECU sub-assembly RH connector.

   HINT: 

   • Since the A79 headlight ECU sub-assembly RH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
   • Since the B and C headlight ECU sub-assembly RH connectors are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.
4. Measure the voltage and check of pulses according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A79-11 (TNS) - Body ground	G - Body ground	Front turn signal light signal input	Engine switch on (IG), front turn signal light off	Below 1 V
   			Engine switch on (IG), front turn signal light blinking	11 to 14 V ←→ Below 1 V
   A79-20 (LINL) - Body ground	W - Body ground	LIN communication line	Engine switch off	Below 1 V
   			Engine switch on (IG)	Pulse generation
   A79-23 (CANL) - Body ground	W - Body ground	CAN communication line	Engine switch off	Below 1 V
   			Engine switch on (IG)	Pulse generation
   A79-24 (CANH) - Body ground	L - Body ground	CAN communication line	Engine switch off	Below 1 V
   			Engine switch on (IG)	Pulse generation
   B-2 (LOLED2) - B-3 (LOLED1)	-	Low beam headlights drive output	Low beam headlights off	Below 1 V
   			Low beam headlights on	21.4 to 30.45 V
   B-4 (FANB) - B-14 (FANG)	-	Headlight fan power source	Low beam headlights off	Below 1 V
   			Low beam headlights on	4.75 to 5.25 V
   B-6 (HILED2) - B-5 (HILED1)	-	Cornering lights drive output	Cornering lights off	Below 1 V
   			Cornering lights on	6.1 to 8.6 V
   B-9 (ACTBI) - B-17 (ACTGI)	-	Headlight leveling motor power source	Engine switch off	Below 1 V
   			Engine switch on (IG)	11 to 14 V
   B-10 (DRL/CLL+) - B-1 (DRL/CLL-)	-	Parking lights/daytime running lights power source	Parking lights and daytime running lights off	Below 1 V
   			Parking lights and daytime running lights on	11 to 14 V
   B-15 (FANP) - B-14 (FANG)	-	Headlight fan control signal input	Low beam headlights off	Below 1 V
   			Low beam headlights on	Pulse generation
   B-16 (PWM1) - B-1 (DRL/CLL-)	-	Parking lights/daytime running lights control signal output	Parking lights and daytime running lights off	Below 1 V
   			Parking lights and daytime running lights on	Pulse generation
   B-18 (FSML+) - B-12 (FSML-)	-	Front side marker lights drive output	Front side marker lights off	Below 1 V
   			Front side marker lights on	11 to 14 V
   B-19 (HI_SOL+) - B-11 (HI_SOL-)	-	High beam headlights drive output	High beam headlights off	Below 1 V
   			High beam headlights on	11 to 14 V
   B-20 (TURN+) - B-13 (TURN-)	-	Front turn signal light signal output	Engine switch on (IG), front turn signal light off	Below 1 V
   			Engine switch on (IG), front turn signal light blinking	11 to 14 V ←→ Below 1 V
   C-13 (LINLI) - Body ground	-	LIN communication line	Engine switch off	Below 1 V
   			Engine switch on (IG)	Pulse generation

Fig 6: A79 Headlight ECU Sub-Assembly RH Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the A79 headlight ECU sub-assembly RH connector.
2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A79-4 (IG) - Body ground	B - Body ground	Ignition power supply	Engine switch off	Below 1 V
   			Engine switch on (IG)	11 to 14 V
   A79-12 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
   A79-13 (ECUB) - Body ground	R - Body ground	Battery power supply	15 seconds or more after engine switch turned off Taillights off	Below 1 V
   			Engine switch on (IG) or within 15 seconds after engine switch turned off Taillights on	9.5 to 14 V

3. Connect the A79 headlight ECU sub-assembly RH connector.

   HINT: 

   • Since the A79 headlight ECU sub-assembly RH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
   • Since the B headlight ECU sub-assembly RH connector are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.
4. Measure the voltage and check of pulses according to the value(s) in the table below.

   Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
   A79-11 (TNS) - Body ground	G - Body ground	Front turn signal light signal input	Engine switch on (IG), front turn signal light off	Below 1 V
   			Engine switch on (IG), front turn signal light blinking	11 to 14 V ←→ Below 1 V
   A79-23 (CANL) - Body ground	W - Body ground	CAN communication line	Engine switch off	Below 1 V
   			Engine switch on (IG)	Pulse generation
   A79-24 (CANH) - Body ground	L - Body ground	CAN communication line	Engine switch off	Below 1 V
   			Engine switch on (IG)	Pulse generation
   B-2 (LOLED2) - B-3 (LOLED1)	-	Low beam headlights drive output	Low beam headlights off	Below 1 V
   			Low beam headlights on	13.37 to 19.04 V
   B-6 (HILED2) - B-5 (HILED1)	-	Cornering lights drive output	Cornering lights off	Below 1 V
   			Cornering lights on	7.99 to 11.8 V
   B-10 (DRL/CLL+) - B-1 (DRL/CLL-)	-	Parking lights/daytime running lights power source	Parking lights and daytime running lights off	Below 1 V
   			Parking lights and daytime running lights on	11 to 14 V
   B-16 (PWM1) - B-1 (DRL/CLL-)	-	Parking lights/daytime running lights control signal output	Parking lights and daytime running lights off	Below 1 V
   			Parking lights and daytime running lights on	Pulse generation
   B-18 (FSML+) - B-12 (FSML-)	-	Front side marker lights drive output	Front side marker lights off	Below 1 V
   			Front side marker lights on	11 to 14 V
   B-19 (HI_SOL+) - B-11 (HI_SOL-)	-	High beam headlights drive output	High beam headlights off	Below 1 V
   			High beam headlights on	11 to 14 V
   B-20 (TURN+) - B-13 (TURN-)	-	Front turn signal light signal output	Engine switch on (IG), front turn signal light off	Below 1 V
   			Engine switch on (IG), front turn signal light blinking	11 to 14 V ←→ Below 1 V

Refer to TERMINALS OF ECU [08/2021 - ]

Refer to TERMINALS OF ECU [08/2021 - ]

Refer to TERMINALS OF ECU [08/2021 - 09/2022] , or refer to TERMINALS OF ECU [09/2022 - ]