Lexus ES manuals

Lexus ES: Terminals Of Ecu

TERMINALS OF ECU

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

(b) 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

(c) Connect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

(d) 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

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.

CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (for LED Type Turn Signal Light)

(a) Disconnect the A78 headlight ECU sub-assembly LH connector.

(b) 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

(c) 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.

(d) 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)

A78-19 (LINS) - Body ground

P - Body ground

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

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

24.2 to 35.4 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

8.05 to 11.8 V

B-9 (ACTBI) - B-17 (ACTGI)

-

Headlight swivel motor and 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-4 (LINSI) - Body ground

-

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

C-13 (LINLI) - Body ground

-

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (for Bulb Type Turn Signal Light)

(a) Disconnect the A78 headlight ECU sub-assembly LH connector.

(b) 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

(c) 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.

(d) 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

10 to 19 V

B-6 (HILED2) - B-5 (HILED1)

-

Cornering lights drive output

Cornering lights off

Below 1 V

Cornering lights on

8.05 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

CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (for LED Type Turn Signal Light)

(a) Disconnect the A79 headlight ECU sub-assembly RH connector.

(b) 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

(c) 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.

(d) 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

A79-19 (LINS) - Body ground

P - Body ground

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

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

24.2 to 35.4 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

8.05 to 11.8 V

B-9 (ACTBI) - B-17 (ACTGI)

-

Headlight swivel motor and 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-4 (LINSI) - Body ground

-

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

C-13 (LINLI) - Body ground

-

LIN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (for Bulb Type Turn Signal Light)

(a) Disconnect the A79 headlight ECU sub-assembly RH connector.

(b) 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

(c) 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.

(d) 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

10 to 19 V

B-6 (HILED2) - B-5 (HILED1)

-

Cornering lights drive output

Cornering lights off

Below 1 V

Cornering lights on

8.05 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

CHECK COMBINATION METER ASSEMBLY

Click here

CHECK FORWARD RECOGNITION CAMERA

Click here

CHECK STEERING SENSOR

Click here

READ NEXT:

 Dtc Check / Clear

DTC CHECK / CLEAR CHECK FOR DTC (MAIN BODY) (a) Connect the Techstream to the DLC3. (b) Turn the engine switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Mai

 Freeze Frame Data

FREEZE FRAME DATA FREEZE FRAME DATA (a) Whenever a lighting system DTC is stored, the headlight ECU sub-assembly and forward recognition camera stores the current vehicle state as freeze frame data. C

 Data List / Active Test

DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a pa

SEE MORE:

 CAN Communication Failure (Message Registry) (U1000)

DESCRIPTION The headlight ECU sub-assembly LH or headlight ECU sub-assembly RH stores this DTC if it detects an internal malfunction related to the CAN communication system. for LED Type Turn Signal Light DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from U100

 Operation Check

OPERATION CHECK CHECK DOOR OPEN LINKED WIPER SUSPEND FUNCTION (w/ Auto Wiper System) (a) Continuously apply water to the windshield glass in front of the rain sensor. (b) Turn the engine switch on (IG). (c) Move the windshield wiper switch assembly to the AUTO position and check that the front wiper

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