Diagnosis System

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DLC3

The vehicle's ECU uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

Fig 1: Identifying DLC3 Connector Terminals (CANL & BAT)

G04828034

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ECU TERMINAL REFERENCE TABLE

Symbols (Terminal No.)

Terminal Description

Condition

Specified condition

SIL (7) - SG (5)

Bus "+" line

During transmission

Pulse generation

CG (4) - Body ground

Chassis ground

Always

Below 1 Ω

SG (5) - Body ground

Signal ground

Always

Below 1 Ω

BAT (16) - Body ground

Battery positive

Always

10 to 14 V

CANH (6) - CANL (14)

HIGH-level CAN bus line

Ignition switch to the OFF position⁽¹⁾

54 to 67 Ω

CANH (6) - CG (4)

HIGH-level CAN bus line

Ignition switch to the OFF position⁽¹⁾

1 kΩ or higher

CANL (14) - CG (4)

HIGH-level CAN bus line

Ignition switch to the OFF position⁽¹⁾

1 kΩ or higher

CANH (6) - BAT (16)

LOW-level CAN bus line

Ignition switch to the OFF position⁽¹⁾

1 MΩ or higher

CANL (14) - BAT (16)

LOW-level CAN bus line

Ignition switch to the OFF position⁽¹⁾

1 MΩ or higher

NOTE:

⁽¹⁾	Before measuring the resistance, leave the vehicle as is for at least 1 minutes and do not operate the ignition switch, any other switches or the doors.

If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

Connect the cable of the intelligent tester (with CAN VIM) to the DLC3, turn the ignition switch to the ON position 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.

Fig 2: Connecting Intelligent Tester To DLC3 With CAN VIM
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:
- 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.