Toyota CH-R Service Manual: Terminals Of Ecu

TERMINALS OF ECU

*A

Main Body ECU (Multiplex Network Body ECU) with 2 Connectors

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-

*1

Main Body ECU (Multiplex Network Body ECU) with 2 Connectors

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-

*a

2 Connectors

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-

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

*A

Main Body ECU (Multiplex Network Body ECU) with 1 Connector

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-

*1

Main Body ECU (Multiplex Network Body ECU)

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-

*a

Main Body ECU (Multiplex Network Body ECU)

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-

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

(b) Measure the voltage 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

3F-1 - Body ground

W - Body ground

Battery power supply

Always

11 to 14 V

3K-1 - Body ground

B-R - Body ground

Battery power supply

Always

11 to 14 V

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

(c) Measure the 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

3D-3 - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

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

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

(e) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

3H-30 - Body ground

G - Body ground

Taillights and license plate lights drive output

Light control switch in tail or head position

11 to 14 V

Light control switch off*1

Below 1 V

3A-52 - Body ground*2

L - Body ground

Front fog light drive output

Light control switch in tail or head position, fog light switch in front position

Below 1 V

Light control switch in tail or head position, fog light switch off

11 to 14 V

3F-31 - Body ground

G - Body ground

H-LP LH relay drive output

Ignition switch off

11 to 14 V

Ignition switch ON

Below 1 V

F15-1 (DIM) - Body ground

Y - Body ground

H-LP RH relay drive output

Ignition switch off

11 to 14 V

Ignition switch ON

Below 1 V

F15-8 (A) - Body ground

W - Body ground

Light control switch AUTO position signal input

Light control switch in AUTO position

Below 1 V

Light control switch not in AUTO position

Pulse generation

F15-10 (HF) - Body ground

LG - Body ground

Dimmer switch high flash position signal input

Dimmer switch in high flash position

Below 1 V

Dimmer switch not in high flash position

Pulse generation

F15-12 (HEAD) - Body ground

L - Body ground

Light control switch head position input

Light control switch in head position

Below 1 V

Light control switch not in head position

Pulse generation

F15-19 (CLTB) - F15-21 (CLTE)

G - V

Automatic light control sensor power supply output

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

F15-20 (CLTS) - Body ground

BE - Body ground

Automatic light control sensor signal input

Ignition switch off

Below 1 V

Automatic light control system operating

Communication waveform generation

(See waveform 1)

F15-22 (TAIL) - Body ground

Y - Body ground

Light control switch tail position signal input

Light control switch in tail or head position

Below 1 V

Light control switch not in tail or head position

Pulse generation

F15-24 (HU) - Body ground

GR - Body ground

Dimmer switch high position signal input

Dimmer switch in high position

Below 1 V

Dimmer switch not in high position

Pulse generation

F15-26 (FFOG) - Body ground*2

R - Body ground

Fog light switch front position input

Fog light switch in front position

Below 1 V

Fog light switch off

Pulse generation

F16-4 (MILE) - Body ground*3

R - Body ground

Door mirror foot lights drive output

Door mirror foot light illuminates

11 to 14 V

Door mirror foot light off

Below 3 V

  • *1: If the light switch has no OFF position, set the light switch to "Auto" with the Lo beam turned off. If the Lo beam is illuminated, shine a fluorescent light or other light source onto the light sensor to enter daytime mode.
  • *2: w/ Fog Light
  • *3: w/ Door Mirror Foot Light

If the result is not as specified, the main body ECU (multiplex network body ECU) or instrument panel junction block assembly may be malfunctioning.

(1) Waveform 1

Item

Content

Tool setting

2 V/DIV., 10 ms./DIV.

HINT:

The communication waveform changes according to the surrounding brightness.

CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (for LED Headlight)

(a) Disconnect the A16 headlight ECU sub-assembly LH connector.

(b) Measure the resistance and voltage 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

A16-4 (IG) - Body ground

V - Body ground

Ignition power supply

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

A16-13 (ECUB) - Body ground

L - Body ground

Battery power supply

Light control switch off*

Below 1 V

Light control switch in tail or head position

11 to 14 V

A16-12 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

  • *: If the light switch has no OFF position, set the light switch to "Auto" with the Lo beam turned off. If the Lo beam is illuminated, shine a fluorescent light or other light source onto the light sensor to enter daytime mode.

(c) Reconnect the A16 headlight ECU sub-assembly LH connector.

HINT:

  • Since the A16 headlight ECU sub-assembly LH connector is a waterproof type connector, the voltage cannot be measured and pulses cannot be checked for directly. The values listed are for reference only.
  • Since the B headlight ECU sub-assembly LH connector is connected inside the headlight assembly, the voltage cannot be measured and pulses cannot be checked for 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

A16-11 (TNS) - Body ground

W - Body ground

Left turn signal light signal input

Ignition switch ON, left turn signal light off

Below 1 V

Ignition switch ON, left turn signal light blinking

11 to 14 V ←→ Below 1 V

A16-16 (SBR) - A16-15 (SGR)

B - BE

Rear height control sensor sub-assembly LH power supply

Ignition switch ON

4.75 to 5.25 V

A16-17 (SHRL) - A16-15 (SGR)

W - BE

Rear height control sensor sub-assembly LH signal input

Ignition switch ON, vehicle unloaded, vehicle stopped

Approximately 2.5 V

(value decreases as the front of the vehicle is raised)

A16-20 (LINL) - Body ground

P - Body ground

LIN communication line

Ignition switch off

Below 1 V

Ignition switch ON

Pulse generation

B-20 (DRL+) - B-11 (DRL-)

-

High beam headlights drive output

High beam headlights off

Below 1 V

High beam headlights on

11 to 14 V

B-4 (LOLED2) - B-3 (LOLED0)

-

Low beam headlights/high beam headlights drive output

Low beam headlights and high beam headlights off

Below 1 V

Low beam headlights or high beam headlights on

11.2 to 17.7 V

B-7 (ACTBI) - B-17 (ACTGI)

-

Headlight leveling motor power source

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

B-8 (ACTSI) - B-17 (ACTGI)

-

Headlight leveling motor signal output

Ignition switch ON, low beam headlights on, vehicle height not changed

Below 1 V

Ignition switch ON, low beam headlights on, vehicle height changed and maintained for more than 3 seconds

1.0 to 14 V

B-9 (TURN+) - B-13 (TURN-)

-

Left turn signal light signal output

Ignition switch ON, left turn signal light off

Below 1 V

Ignition switch ON, left turn signal light blinking

11 to 14 V ←→ Below 1 V

B-16 (PWM1) - B-1 (HI-)

-

Daytime running lights/clearance lights control signal output

Daytime running lights and clearance lights off

Below 1 V

Daytime running lights or clearance lights on

Pulse generation

B-10 (HI+) - B-1 (HI-)

-

Daytime running lights/clearance lights power source

Daytime running lights and clearance lights off

Below 1 V

Daytime running lights or clearance lights on

11 to 14 V

CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (for LED Headlight)

(a) Disconnect the A17 headlight ECU sub-assembly RH connector.

(b) Measure the resistance and voltage 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

A17-4 (IG) - Body ground

V - Body ground

Ignition power supply

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

A17-13 (ECUB) - Body ground

L - Body ground

Battery power supply

Light control switch off*

Below 1 V

Light control switch in tail or head position

11 to 14 V

A17-12 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

  • *: If the light switch has no OFF position, set the light switch to "Auto" with the Lo beam turned off. If the Lo beam is illuminated, shine a fluorescent light or other light source onto the light sensor to enter daytime mode.

(c) Reconnect the A17 headlight ECU sub-assembly RH connector.

HINT:

  • Since the A17 headlight ECU sub-assembly RH connector is a waterproof type connector, the voltage cannot be measured and pulses cannot be checked for directly. The values listed are for reference only.
  • Since the B headlight ECU sub-assembly RH connector is connected inside the headlight assembly, the voltage cannot be measured and pulses cannot be checked for 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

A17-11 (TNS) - Body ground

B - Body ground

Right turn signal light signal input

Ignition switch ON, right turn signal light off

Below 1 V

Ignition switch ON, right turn signal light blinking

11 to 14 V ←→ Below 1 V

A17-20 (LINL) - Body ground

P - Body ground

LIN communication line

Ignition switch off

Below 1 V

Ignition switch ON

Pulse generation

B-20 (DRL+) - B-11 (DRL-)

-

High beam headlights drive output

High beam headlights off

Below 1 V

High beam headlights on

11 to 14 V

B-4 (LOLED2) - B-3 (LOLED0)

-

Low beam headlights/high beam headlights drive output

Low beam headlights and high beam headlights off

Below 1 V

Low beam headlights or high beam headlights on

11.2 to 17.7 V

B-7 (ACTBI) - B-17 (ACTGI)

-

Headlight leveling motor power source

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

B-8 (ACTSI) - B-17 (ACTGI)

-

Headlight leveling motor signal output

Ignition switch ON, low beam headlights on, vehicle height not changed

Below 1 V

Ignition switch ON, low beam headlights on, vehicle height changed and maintained for more than 3 seconds

1.0 to 14 V

B-9 (TURN+) - B-13 (TURN-)

-

Right turn signal light signal output

Ignition switch ON, right turn signal light off

Below 1 V

Ignition switch ON, right turn signal light blinking

11 to 14 V ←→ Below 1 V

B-16 (PWM1) - B-1 (HI-)

-

Daytime running lights/clearance lights control signal output

Daytime running lights and clearance lights off

Below 1 V

Daytime running lights or clearance lights on

Pulse generation

B-10 (HI+) - B-1 (HI-)

-

Daytime running lights/clearance lights power source

Daytime running lights and clearance lights off

Below 1 V

Daytime running lights or clearance lights on

11 to 14 V

CHECK COMBINATION METER ASSEMBLY

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