Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CAN BUS WIRE (MAIN BUS LINE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT)

Disconnect the G3 gateway ECU connector.

Fig 1: Identifying G3 Gateway ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the DLC3.

Fig 2: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition	Proceed to
D1-6 (CANH) - D1-14 (CANL)	Ignition switch OFF	54 to 69 Ω	OK
D1-6 (CANH) - D1-14 (CANL)	Ignition switch OFF	69 Ω or more	NG-A
D1-6 (CANH) - D1-14 (CANL)	Ignition switch OFF	54 Ω or less	NG-B

NG-A: CHECK FOR OPEN IN CAN MAIN BUS LINE

NG-B: CHECK FOR SHORT IN CAN BUS LINE

OK: Go to Next step

CONNECT CONNECTOR
1. Reconnect the G3 gateway ECU connector.

CHECK CAN BUS WIRE (FOR SHORT TO B+)

Measure the resistance of the DLC3.

Fig 3: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-16 (BAT)	Ignition switch OFF	1 MΩ or higher
D1-14 (CANL) - D1-16 (BAT)	Ignition switch OFF	1 MΩ or higher

NG: CHECK FOR SHORT TO B+ IN CAN BUS LINE

OK: Go to Next step

CHECK CAN BUS WIRE (FOR SHORT TO GND)

Measure the resistance of the DLC3.

Fig 4: Identifying DLC3 Connector Terminals

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
D1-4 (CG) - D1-6 (CANH)	Ignition switch OFF	1 kΩ or higher
D1-4 (CG) - D1-14 (CANL)	Ignition switch OFF	1 kΩ or higher

NG: CHECK FOR SHORT TO GND IN CAN BUS LINE

OK: HOW TO PROCEED WITH TROUBLESHOOTING