Toyota CH-R Service Manual: ECU Power Source Circuit

DESCRIPTION

This circuit supplies power to the millimeter wave radar sensor assembly when the ignition switch is ON.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY (IGB VOLTAGE)

(a) Disconnect the millimeter wave radar sensor assembly connector.

*a

Front view of wire harness connector

(to Millimeter Wave Radar Sensor Assembly)

(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A2-8 (IGB) - Body ground

Ignition switch ON

11 to 14 V

(d) Turn the ignition switch off.

(e) Reconnect the millimeter wave radar sensor assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

OK

2.

CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - BODY GROUND)

(a) Disconnect the millimeter wave radar sensor assembly connector.

*a

Front view of wire harness connector

(to Millimeter Wave Radar Sensor Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A2-1 (SGND) - Body ground

Always

Below 1 Ω

(c) Connect the millimeter wave radar sensor assembly connector.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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