Toyota CH-R Service Manual: Terminals Of Ecu

TERMINALS OF ECU

CHECK WINDSHIELD WIPER RELAY ASSEMBLY (w/ Rain Sensor)

(a) Disconnect the F56 windshield wiper relay assembly connector.

(1) 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

F56-2 (IG) - Body ground

B - Body ground

Ignition switch ON signal (Power source circuit)

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

F56-25 (W) - Body ground

B - Body ground

Front washer switch signal

Front washer switch on

Below 1 Ω

Front washer switch off

10 kΩ or higher

F56-8 (VR2) - F56-21 (VR1)

W - G

Adjusting volume signal

controlling sensitivity setting switch* changed

0 to 231 Ω

F56-12 (E) - Body ground

W-B - Body ground

Body ground

Always

Below 1 Ω

F56-16 (WIG) - Body ground

B - Body ground

Power source signal

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

HINT:

*: The rain sensor sensitivity can be adjusted by the controlling sensitivity setting switch.

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

(b) Reconnect the F56 windshield wiper relay assembly connector.

(1) Measure the resistance according to the value(s) in the table below.

Terminal No.

(Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F56-10 (+1) - Body ground

G - Body ground

Front wiper motor low speed signal

Front wiper motor off

Below 1 Ω

HINT:

If the result is not as specified, the windshield wiper relay assembly may be malfunctioning.

(2) 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

F56-1 (+SM) - Body ground

G - Body ground

Front wiper motor position detection signal

Front wiper motor in low or high operation

Below 1 V ←→ 11 to 14 V

Front wiper motor off

Below 1 V

F56-3 (C1) - F56-5 (CO)

V - Y

Front wiper switch AUTO signal

Ignition switch ON, front wiper switch in AUTO

Below 1 V

Ignition switch ON, front wiper switch off

11 to 14 V

F56-25 (W) - Body ground

B - Body ground

Front washer switch signal

Ignition switch ON, front washer switch on

Below 1 V

Ignition switch ON, front washer switch off

11 to 14 V

F56-10 (+1) - Body ground

G - Body ground

Front wiper motor low speed signal

Front wiper motor in low operation

11 to 14 V

F56-11 (+2) - Body ground

W - Body ground

Front wiper motor high speed signal

Front wiper motor in high operation

11 to 14 V

Front wiper motor off

Below 1 V

F56-14 (MPX1) - Body ground

V - Body ground

Rain sensor signal

Ignition switch ON

Pulse generation

F56-24 (SPD) - Body ground

V - Body ground

Vehicle speed signal

Driving at approximately 20 km/h (12 mph)

Pulse generation (See waveform 1)

HINT:

If the result is not as specified, the windshield wiper relay assembly may be malfunctioning.

(3) Waveform 1 (Reference):

Item

Condition

Tester Connection

F56-24 (SPD) - Body ground

Tool Setting

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

Vehicle Condition

Driving at approximately 20 km/h (12 mph)

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.

CHECK COMBINATION METER ASSEMBLY

(a) Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F4-17 (WLVL) - Body ground*1

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

  • *1: for Cold Area Specification Vehicles

(b) Measure the waveform according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F4-6 (+S) - Body ground

V - Body ground

Speed signal for other system (Output)

Driving at approximately 20 km/h (12 mph)

Pulse generation (See waveform 1)

(1) Waveform 1 (Reference):

Item

Condition

Tester Connection

F4-6 (+S) - Body ground

Tool Setting

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

Vehicle Condition

Driving at approximately 20 km/h (12 mph)

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.

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