Power Source Circuit: Procedure

1. Measure the voltage according to value(s) in the table below.
   Fig 1: Identifying E58 Certification ECU Connector (+B Terminal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Symbol (Tester Connection)	Condition	Specified Condition
   +B (E58-1) - E (E58-17)	Always	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the voltage according to value(s) in the table below.
   Fig 2: Identifying E58 Certification ECU Connector (RC0 Terminal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Symbol (Tester Connection)	Condition	Specified Condition
   RC0 (E58-29) - E (E58-17)	Engine switch off, all doors closed and transmitter switch not pressed	Below 1 V
   	Engine switch off, all doors closed and transmitter switch pressed	4.6 to 5.4 V

OK → See step   4 

NG: Go to next step 

1. Disconnect the E58 certification ECU connector.
2. Measure the voltage and resistance according to value(s) in the table below.
   Fig 3: Identifying E58 Certification ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard

   Symbol (Tester Connection)	Condition	Specified Condition
   RC0 (E58-29) - Body ground	Always	Below 1 V
   	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE CERTIFICATION ECU 

1. Disconnect the O18 door control receiver connector.
   Fig 4: Checking Harness And Connector (Certification ECU -- Door Control Receiver)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Symbol (Tester Connection)	Condition	Specified Condition
   RC0 (E58-29) - +5 (O18-2)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 5: Checking Harness And Connector (Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Symbol (Tester Connection)	Condition	Specified Condition
   GND (O18-6) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   6