Inspection Procedure

1. Turn the engine switch off.
2. Disconnect the clearance warning ECU connector (A38).
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Value
   A38-23 (R1) - A38-24 (R2)	Engine switch off	54 to 69 Ω

Fig 1: Identifying Clearance Warning ECU A38 Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE CLEARANCE WARNING ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) 

OK: Go to next step 

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

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Value
   A38-27 (E) - Body ground	Always	Below 1 Ω

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

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Condition	Specified Value
   A38-8 (IG) - Body ground	Engine switch off	10 to 14 V

Fig 2: Identifying Clearance Warning ECU A38 Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE CLEARANCE WARNING ECU