Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus GX 470. 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)

Fig 1: Identifying CANH & CANL Terminals Of DLC3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFICATION TABLE

Tester connection	Condition	Specified value	Result
D3-6 (CANH) - D3-14 (CANL)	IG switch OFF Stop light switch OFF	54 to 69 Ω	OK
D3-6 (CANH) - D3-14 (CANL)	IG switch OFF Stop light switch OFF	69 Ω or higher	NG-A
D3-6 (CANH) - D3-14 (CANL)	IG switch OFF Stop light switch OFF	Below 54 Ω	NG-B

NG-A: CHECK CAN MAIN BUS LINE FOR DISCONNECTION

NG-B: CHECK CAN BUS LINES FOR SHORT CIRCUIT

OK: Go to next step

CHECK CAN BUS LINE FOR SHORT TO +B

Fig 2: Identifying CANH, BATT & CANL Terminals Of DLC3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFICATION TABLE

Tester connection	Condition	Specified value
D3-6 (CANH) - D3-16 (BATT)	IG switch OFF Stop light switch OFF	1 MΩ or higher
D3-14 (CANL) - D3-16 (BATT)	IG switch OFF Stop light switch OFF	1 MΩ or higher

NG: CHECK CAN BUS LINE FOR SHORT TO +B

OK: Go to next step

CHECK CAN BUS LINE FOR SHORT TO GND

Fig 3: Identifying CG, CANH & CANL Terminals Of DLC3

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFICATION TABLE

Tester connection	Condition	Specified value
D3-4 (CG) - D3-6 (CANH)	IG switch OFF Stop light switch OFF	3 kΩ or higher
D3-4 (CG) - D3-14 (CANL)	IG switch OFF Stop light switch OFF	3 kΩ or higher

NG: CHECK CAN BUS LINE FOR SHORT TO GND

OK: GO TO HOW TO PROCEED WITH TROUBLESHOOTING