Clearance Warning ECU Power Source Circuit [11/2023 - ]: Procedure

1. Disconnect the H46 clearance warning ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with wire harness connected (to Clearance Warning ECU Assembly)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   H46-1 (IG) - Body ground	Ignition switch ON	11 to 14 V*1 10.5 to 16 V*2
   H46-1 (IG) - Body ground	Ignition switch off	Below 1 V

   1. *1: w/o Stop and Start System
   2. *2: w/ Stop and Start System

   Result

   Result	Proceed to
   OK	A
   NG (w/o Stop and Start System)	B
   NG (w/ Stop and Start System)	C

Result: 

B 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

C 

GO TO STOP AND START SYSTEM 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ]

Result: 

A 

See step  2

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H46-31 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

Refer to PROBLEM SYMPTOMS TABLE [11/2023 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR