2003 LEXUS LS430 navigation system

Fig. 35: Identifying DLC3 Connector terminals
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a. Measure the resistance according to the value (s) in the table below.
Standard:
ECM CONNECTOR TERMINALS RESISTANCE
HINT:
NG-A: w/o LEXUS Navigation System.
NG-B: w/ LEXUS Navigation System.
NG-A: CHECK CAN BUS LINE FOR SHORT TO GND (W/O LEXUS NAVIGATION SYSTEM)
Tester ConnectionConditionSpecified value
D1-4 (CG) - D1-6 (CANH)Ignition Switch OFF1 kohms or more
D1-4 (CG) - D1-14 (CANL)Ignition Switch OFF1 kohms or more

NG-B: CHECK CAN BUS LINE FOR SHORT TO GND (W/ LEXUS NAVIGATION SYSTEM)
OK: HOW TO PROCEED WITH TROUBLESHOOTING
MODE DESCRIPTION
Fig. 36: Problem Symptom Diagnostic Chart

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WIRING DIAGRAM

Fig. 73: Wiring Diagram - Can Main Bus Line For Disconnection (W/ LEXUS Navigation System)
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INSPECTION PROCEDURE
1.CHECK DLC3

Fig. 80: Wiring Diagram - CAN Main Bus Line For Disconnection (W/O Lexus Navigation System)
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INSPECTION PROCEDURE
1.CHECK DLC3

Fig. 85: Wiring Diagram - CAN Bus Lines For Short Circuit (W/ Lexus Navigation System)
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INSPECTION PROCEDURE
1.CHECK CAN BUS LINES FOR SHORT CIRCUIT (DLC3 SUB BUS LINE)

Fig. 124: Wiring Diagram - CAN Bus Lines For Short Circuit (W/O LEXUS Navigation System)
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INSPECTION PROCEDURE
1.CHECK CAN BUS LINES FOR SHORT CIRCUIT (DLC3 SUB BUS LINE)

Fig. 153: Wiring Diagram - CAN Bus Line For Short To +B (W/ LEXUS Navigation System) (1 Of 2)
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Fig. 154: Wiring Diagram - CAN Bus Line For Short To +B (W/ LEXUS Navigation System) (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR SHORT TO +B (DLC3 SUB BUS LINE)