Toyota CH-R Service Manual: Terminals Of Ecu

TERMINALS OF ECU

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

*A

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

-

-

*1

Main Body ECU (Multiplex Network Body ECU)

-

-

*a

2 Connectors

-

-

*A

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

-

-

*1

Main Body ECU (Multiplex Network Body ECU)

-

-

*a

1 Connector

-

-

(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

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

F15-12 (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

F15-17 (AHBI) - Body ground

Y - Body ground

Auto high beam switch signal input

Ignition switch on, auto high beam switch off

11 to 14 V

Ignition switch on, auto high beam switch on

Below 1 V

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 lightcontrol sensor signalinput

Ignition switch off

Below 1 V

Automatic lightcontrol systemoperating

Communicationwaveformgeneration(See waveform 1)

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)

F15-24 (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

  • *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.

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)

Click here

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

Click here

CHECK FORWARD RECOGNITION CAMERA

Click here

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