Diagnosis System

1. The main body ECU RH controls the functions of the wireless door lock control system on the vehicle. Wireless door lock control system data can be read in the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the intelligent tester to check for a malfunction and perform repairs.

1. The main body ECU RH uses ISO 9141-2 BEAN for its communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.
   Fig 1: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   DLC3 CONNECTOR TERMINALS
   
   

   Symbol	Terminal No.	Name	Reference terminal	Result	Condition
   SIL	7	Bus" + line	5-Signal ground	Pulse generation	During transmission
   CG	4	Chassis ground	Body ground	1 Ω or less	Always
   SG	5	Signal ground	Body ground	1 Ω or less	Always
   BAT	16	Battery positive	Body ground	9 to 14 V	Always

2. Connect the cable of the intelligent tester (with CAN VIM) to the DLC3, turn the engine switch on (IG) and attempt to use the intelligent tester. If the screen displays a communication error message, a problem exists in the vehicle side or with the tester side.
   • If communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
   • If communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself. Consult the Service Department listed in the tool's instruction manual.
   Fig 2: Connecting Intelligent Tester To DLC3

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Voltage: 

11 to 14 V 

If voltage is below 11 V, replace the battery.