Entry Functions do not Operate at All: Procedure

1. Check that the key cancel function is set.

   OK

   Key cancel function is set.

OK → END (UNSET KEY CANCEL FUNCTION) 

NG: Go to next step 

1. Remove the SECURITY and ECU-IG RH fuses from the main body ECU RH.
2. Measure the resistance of the fuse.

   Standard resistance

   Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

Fig 1: Identifying U28 ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the U28 ECU connector.
2. Measure the voltage and resistance of the wire harness side connector.

   Standard voltage

   Standard resistance 

   Tester Connection	Condition	Specified Condition
   U28-18 (IG) - Body ground	Power switch OFF	Below 1 V
   U28-18 (IG) - Body ground	Power switch ON (IG)	10 to 14 V
   U28-1 (+B1) - Body ground	Always	10 to 14 V

   Tester Connection	Specified Condition
   U28-17 (E) - Body ground	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE CERTIFICATION ECU