Inspection Procedure

1. Disconnect the DA and DD ECU connectors.
2. Disconnect the K73 ECU connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   DD-2 - K73-11 (ACCD)	Below 1 Ω
   DA-5 - Body ground	Below 1 Ω
   DD-7 - Body ground	Below 1 Ω
   K73-11 (ACCD) - Body ground	10 kΩ or higher
   DD-2 or K73-11 (ACCD) - Body ground	10 kΩ or higher

Fig 1: Identifying DA And DD ECU Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: GO TO Next Step 

1. Disconnect the DD and DM ECU connectors.
2. Measure the resistance of the ECU connectors.

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   DM-1 - DD-27 or DD-26	When battery voltage is not applied to terminals DD-2 and DD-7 or DA-5	10 kΩ or higher
   DM-1 - DD-27 or DD-26	When battery voltage is applied to terminals DM-1 and DD-7 or DA-5	Below 1 Ω
   DD-2 - DD-7	20°C (68°F)	Approx. 88.2 Ω

Fig 2: Identifying DD And DM ECU Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE MAIN BODY ECU RH 

OK: GO TO Next Step 

1. Measure the output voltage of the power source control ECU.

   Standard voltage 

   STANDARD VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   11 (ACCD) - Body ground	Power switch ON (ACC)	10 to 14 V

Fig 3: Identifying Power Source Control ECU Connector (ACCD)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE POWER SOURCE CONTROL ECU 

OK: END