Toyota Avalon Service & Repair Manual: 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

4D-3 - Body ground

LA - Body ground

Ground

Always

Below 1 Ω

4F-1 - Body ground

LG - Body ground

Battery power supply

Always

11 to 14 V

4K-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

4F-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

4F-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

4H-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

4H-30 - Body ground

LA-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

G32-19 (GND2) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

G32-23 (AHID) - Body ground

BE - Body ground

Auto high beam switch indicator drive output

Engine switch on (IG), auto high beam switch on

Below 1 V

Engine switch on (IG), auto high beam switch off

11 to 14 V

G33-12 (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

G33-16 (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

G33-23 (CLTB) - G33-25 (CLTE)

BE - GR

Automatic light control sensor power supply output

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

G33-24 (CLTS) - Body ground

R - Body ground

Automatic light control sensor signal input

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

(See waveform 1)

G33-26 (AHBI) - Body ground

B - Body ground

Auto high beam switch signal input

Auto high beam switch on

Below 1 V

Auto high beam switch off

11 to 14 V

(1) Waveform 1

Item

Content

Tester Connection

G33-24 (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

(a) Disconnect the A8 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

A8-4 (IG) - Body ground

B - Body ground

Ignition power supply

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

A8-12 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

A8-13 (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 A8 headlight ECU sub-assembly LH connector.

HINT:

  • Since the A8 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

A8-11 (TNS) - Body ground

LA-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

A8-23 (CANL) - Body ground

W - Body ground

CAN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

A8-24 (CANH) - Body ground

P - 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

19.2 to 27.9 V

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

-

Low beam headlights drive output

Low beam headlights off

Below 1 V

Low beam headlights on

15.5 to 24.0 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-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 light drive output

Front side marker light off

Below 1 V

Front side marker light on

11 to 14 V

B-19 (HI_SOL+) - B-11 (HI_SOL-)

-

Cornering light power source

Cornering light off

Below 1 V

Cornering light 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-6 (ADD+) - C-1 (ADD-)

-

High beam headlights drive output

High beam headlights off

Below 1 V

High beam headlights on

11 to 14 V

C-12 (PWM2) - B-11 (HI_SOL-)

-

Cornering light control signal output

Cornering light off

Below 1 V

Cornering light on

Pulse generation

CHECK HEADLIGHT ECU SUB-ASSEMBLY RH

(a) Disconnect the A9 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

A9-4 (IG) - Body ground

B - Body ground

Ignition power supply

Engine switch off

Below 1 V

Engine switch on (IG)

11 to 14 V

A9-12 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

A9-13 (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 A9 headlight ECU sub-assembly RH connector.

HINT:

  • Since the A9 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

A9-11 (TNS) - Body ground

LA-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

A9-23 (CANL) - Body ground

W - Body ground

CAN communication line

Engine switch off

Below 1 V

Engine switch on (IG)

Pulse generation

A9-24 (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

19.2 to 27.9 V

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

-

Low beam headlights drive output

Low beam headlights off

Below 1 V

Low beam headlights on

15.5 to 24.0 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-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 light drive output

Front side marker light off

Below 1 V

Front side marker light on

11 to 14 V

B-19 (HI_SOL+) - B-11 (HI_SOL-)

-

Cornering light power source

Cornering light off

Below 1 V

Cornering light 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-6 (ADD+) - C-1 (ADD-)

-

High beam headlights drive output

High beam headlights off

Below 1 V

High beam headlights on

11 to 14 V

C-12 (PWM2) - B-11 (HI_SOL-)

-

Cornering light control signal output

Cornering light off

Below 1 V

Cornering light on

Pulse generation

CHECK COMBINATION METER ASSEMBLY

Click here

CHECK FORWARD RECOGNITION CAMERA

Click here

CHECK STEERING SENSOR

Click here

    Taillight Relay Circuit

    Turn Signal Switch Circuit

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