Millimeter Wave Radar Sensor Power Source Circuit: Procedure

CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY (IGB VOLTAGE)

Fig 1: Checking A77 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NOTE:

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

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

Standard Voltage

Tester Connection	Condition	Specified Condition
A77-5 (IGB) - A77-2 (SGND)	Power switch on (IG)	10 to 14 V

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly)

NG → See step 2

OK → See step 3

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

Disconnect the millimeter wave radar sensor assembly connector.

Fig 2: Checking A77 Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance (Check for Open)

Tester Connection	Condition	Specified Condition
A77-2 (SGND) - Body ground	Always	Below 1 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - BODY GROUND)

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - IG1 NO. 1 RELAY)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to HOW TO PROCEED WITH TROUBLESHOOTING