Toyota Yaris: Dynamic Radar Cruise Control System / Terminals Of Ecu

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Engine & Hybrid System / Cruise Control / Dynamic Radar Cruise Control System / Terminals Of Ecu

TERMINALS OF ECU

CHECK ECM

HINT:

The standard voltage, resistance and waveform between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals are also indicated. The result of checks should be compared with the standard voltage, resistance and waveform for each pair of the terminals as displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

A106-21 (STP) - A106-10 (E1)

Stop light switch assembly signal

Brake pedal depressed

7.5 to 14 V

Brake pedal released

0 to 1.5 V

A106-22(ST1-) - A106-10(E1)

Stop light switch assembly signal

(opposite to STP terminal)

Ignition switch ON, brake pedal depressed

0 to 1.5 V

Ignition switch ON, brake pedal released

7.5 to 14 V

A106-27 (CCS) - A106-28 (ECCS)

Steering pad switch circuit

Cruise control switch not pushed

1 MΩ or higher

Cruise control main switch pushed

Below 2.5 Ω

CANCEL switch pushed

228 to 252 Ω

+RES switch pushed

599 to 661 Ω

-SET switch pushed

1463 to 1617 Ω

NOTICE:

  • Turning the ignition switch to ON with connectors disconnected may cause DTCs to be stored. Make sure to clear the DTCs after inspection has been performed.
  • Do not apply excessive force to the millimeter wave radar sensor assembly connector.

CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

B8-8 (IGB) - B8-1 (SGND)

Power source

Ignition switch ON

10.5 to 16 V

Ignition switch off

Below 1 V

B8-1 (SGND) - Body ground

Ground

Always

Below 1 Ω

NOTICE:

  • Turning the ignition switch ON with connectors disconnected may cause DTCs to be stored. Make sure to clear the DTCs after inspection has been performed.
  • Do not apply excessive force to the forward recognition camera connector.

CHECK FORWARD RECOGNITION CAMERA

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

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

V10-3 (LKSW) - V10-10 (GND)

Steering pad switch assembly signal (distance control signal)

Ignition switch ON, steering pad switch assembly (vehicle-to-vehicle distance control switch) on

Below 1 V

Ignition switch ON, steering pad switch assembly (vehicle-to-vehicle distance control switch) off

4.75 to 5.25 V

V10-10 (GND) - Body ground

Ground

Always

Below 1 Ω

V10-7 (IGB) - V10-10 (GND)

Power source

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

    Problem Symptoms Table

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