Toyota CH-R Service Manual: Terminals Of Ecu

TERMINALS OF ECU

COMBINATION METER ASSEMBLY

(a) Disconnect the combination meter assembly connectors.

(b) Measure the voltage on the wire harness side connector according to the value(s) in the table below.

Terminal No.

Wiring Color

Terminal Description

Condition

Specified Condition

F4-39 (IG+) - Body ground

P - Body ground

Ignition switch signal

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

F4-40 (B) - Body ground

SB - Body ground

Battery

Always

11 to 14 V

F5-1 (B) - Body ground

SB - Body ground

Battery

Always

11 to 14 V

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

(c) Reconnect the combination meter assembly connectors.

(d) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F4-1 (RLMT) - Body ground*1

L - Body ground

Rear seat belt LH warning light signal

Rear seat belt LH fastened within 30 seconds of opening rear door with ignition switch ON

11 to 14 V

Rear seat belt LH unfastened within 30 seconds of opening rear door with ignition switch ON

Below 1 V

F4-2 (RCMT) - Body ground*1

V - Body ground

Rear seat center belt warning light signal

Rear seat center belt fastened within 30 seconds of opening rear door with ignition switch ON

11 to 14 V

Rear seat center belt unfastened within 30 seconds of opening rear door with ignition switch ON

Below 1 V

F4-3 (RRMT) - Body ground*1

W - Body ground

Rear seat belt RH warning light signal

Rear seat belt RH fastened within 30 seconds of opening rear door with ignition switch ON

11 to 14 V

Rear seat belt RH unfastened within 30 seconds of opening rear door with ignition switch ON

Below 1 V

F4-4 (INT) - Body ground*2

B - Body ground

Tire pressure warning light signal

Ignition switch ON, tire pressure warning light off

Below 1 V

Ignition switch ON, tire pressure warning light on

11 to 14 V

F4-5 (SI) - Body ground

GR - Body ground

Speed signal for other system (Input)

Ignition switch ON, wheel being rotated

Pulse generation (See waveform 1)

F4-6 (+S) - Body ground

V - Body ground

Speed signal for other system (Output)

Ignition switch ON, wheel being rotated

Pulse generation (See waveform 1)

F4-7 (PKBI) - Body ground*3

GR - Body ground

Front passenger side seat belt buckle switch signal

Ignition switch ON, front passenger side seat belt fastened and front passenger seat occupied

11 to 14 V

Ignition switch ON, front passenger side seat belt unfastened and front passenger seat occupied

Below 1 V

F4-9 (S) - Body ground

G - Body ground

Engine oil pressure switch signal

Ignition switch ON, low engine oil level warning light on

Below 1 V

Ignition switch ON, low engine oil level warning light off

11 to 14 V

F4-10 (MSD) - Body ground*1

V - Body ground

Rear seat inner belt signal (LH side)

Ignition switch ON, rear LH seat belt unfastened

Below 1 V

Ignition switch ON, rear LH seat belt fastened

11 to 14 V

F4-11 (MSTI) - Body ground*1

BE - Body ground

Rear seat inner belt signal (Center)

Ignition switch ON, rear center seat belt unfastened

Below 1 V

Ignition switch ON, rear center seat belt fastened

11 to 14 V

F4-12 (SW) - Body ground

R - Body ground

Brake system warning light (red indicator) signal

Ignition switch ON, brake system warning light (red indicator) on

Below 1 V

Ignition switch ON, brake system warning light (red indicator) off

11 to 14 V

F4-13 (MSFM) - Body ground*1

R - Body ground

Rear seat inner belt signal (RH side)

Ignition switch ON, rear RH seat belt unfastened

Below 1 V

Ignition switch ON, rear RH seat belt fastened

11 to 14 V

F4-16 (FV) - Body ground

GR - Body ground

Fuel sender gauge (Power source)

Fuel F (full tank) → E (empty)

4.5 to 5.5 V

F4-17 (WLVL) - Body ground*4

LG - Body ground

Washer fluid level signal

Ignition switch ON washer fluid level not low

11 to 14 V

Ignition switch ON washer fluid level low

Below 1 V

F4-20 (SW3) - Body Ground

W - Body ground

Light control rheostat switch ground

Always

Below 1 Ω

F4-21 (ET) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

F4-23 (FR) - F4-15 (FE&B)

G - BE

Fuel level signal

Ignition switch ON fuel level full

Below 1 V

Ignition switch ON fuel level low (fuel level warning light on)

4.5 to 9 V

F4-24 (TC) - Body Ground

V - Body ground

TAIL cancel switch signal

TAIL cancel switch OFF → ON

10 kΩ or higher → Below 1 Ω

F4-25 (SW1) - Body Ground

G - Body ground

Power source for light control rheostat

Ignition switch ON

4.6 to 5.4 V

F4-26 (SW2) - Body Ground

L - Body ground

Light control rheostat knob input

Light control rheostat knob fully turned downward

Below 1 Ω

Light control rheostat knob fully turned upward

10 kΩ or higher

F4-28 (MSM+) - Body ground

V - Body ground

Steering pad switch signal

Ignition switch ON, enter, trip and back switches on steering pad switch not pushed

4.3 to 5.2 V

Ignition switch ON, enter switch on steering pad switch pushed

Below 0.6 V

Ignition switch ON, trip switch on steering pad switch pushed

1.0 to 2.2 V

Ignition switch ON, back switch on steering pad switch pushed

2.3 to 3.4 V

F4-31 (CANL) - Body ground

SB - Body ground

CAN communication line

-

-

F4-32 (CANH) - Body ground

V - Body ground

CAN communication line

-

-

F4-33 (MSSL) - Body ground

GR - Body ground

Steering pad switch signal

Ignition switch ON, up, down, right and left switches on steering pad switch assembly not pushed

4.3 to 5.2 V

Ignition switch ON, left switch on steering pad switch pushed

Below 0.6 V

Ignition switch ON, up switch on steering pad switch pushed

1.0 to 2.2 V

Ignition switch ON, down switch on steering pad switch pushed

2.3 to 3.4 V

Ignition switch ON, right switch on steering pad switch pushed

3.4 to 4.5 V

F4-34 (TEMP) - Body ground

SB - Body ground

Ambient temperature sensor signal

Ambient temperature 25°C (77°F)

1.6 to 1.8 Ω

F4-35 (TX1+) - Body ground

P - Body ground

Ambient temperature sensor gauge signal

Always

Below 1 Ω

F5-2 (VCM) - Body ground*5

GR - Body ground

Vacuum warning switch signal

Ignition switch ON, engine idle speed

Pulse generation

F5-3 (HAZ) - Body ground

W - Body ground

Hazard warning signal switch signal (Output)

Hazard warning signal switch off

11 to 14 V

Hazard warning signal switch on

Below 1 V

F5-5 (TRNR) - Body ground

SB - Body ground

Rear turn signal light RH signal

Ignition switch ON, RH turn indicator light off

Below 1 V

Ignition switch ON, RH turn indicator light blinking

11 to 14 V ←→ Below 1 V

F5-6 (TRNL) - Body ground

Y - Body ground

Rear turn signal light LH signal

Ignition switch ON, LH turn indicator light off

Below 1 V

Ignition switch ON, LH turn indicator light blinking

11 to 14 V ←→ Below 1 V

F5-7 (LR) - Body ground

V - Body ground

Rear turn signal light RH signal

Ignition switch ON, RH turn indicator light off

Below 1 V

Ignition switch ON, RH turn indicator light blinking

11 to 14 V ←→ Below 1 V

F5-8 (SW) - Body ground

L - Body ground

Turn signal switch (full turn) signal

Headlight dimmer switch on (full turn)

Below 1 V

Headlight dimmer switch off

11 to 14 V

F5-9 (ER) - Body ground

P - Body ground

RH turn indicator light signal (Input)

Ignition switch ON, RH turn signal switch on

Below 1 V

Ignition switch ON, RH turn signal switch off

11 to 14 V

F5-10 (EL) - Body ground

B - Body ground

LH turn indicator light signal (Input)

Ignition switch ON, LH turn signal switch on

Below 1 V

Ignition switch ON, LH turn signal switch off

11 to 14 V

F5-13 (LL) - Body ground

G - Body ground

Rear turn signal light LH signal

Ignition switch ON, LH turn indicator light off

Below 1 V

Ignition switch ON, LH turn indicator light blinking

11 to 14 V ←→ Below 1 V

  • *1: w/ Rear Passenger Seat Belt Warning
  • *2: w/ Tire Pressure Warning System
  • *3: w/o Occupant Classification System
  • *4: w/ Washer Level Warning Switch
  • *5: w/ Vacuum Warning Switch

If the result is not as specified, the combination meter assembly may be malfunctioning.

(1) Waveform 1 (Reference):

Item

Condition

Tool setting

5 V/DIV., 20 ms./DIV.

Vehicle condition

Ignition switch ON wheel being rotated

HINT:

When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

    Problem Symptoms Table
    PROBLEM SYMPTOMS TABLE NOTICE: When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, th ...

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    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 decidi ...

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