Toyota CH-R Service Manual: ECU Power Source Circuit

Toyota CH-R Service Manual / Pre-collision / Pre-collision System / 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.

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.

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

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

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

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