2003 LEXUS LS430 Diagram AC

Fig. 8: Wiring Diagram - Can Communication System (W/O LEXUS Navigation System)
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HINT:
The position of the terminus circuit differs in vehicles with and without the LEXUS navigation system.
The skid control ECU with actuator detects and stores steering sensor and yaw rate sensor DTCs and
performs DTC communication by receiving information from the steering sensor and yaw rate sensor.
The ECM detects and stores distance control ECU DTCs, and performs DTC communication by
receiving information from the distance control ECU.
The ECM uses the CAN communication system to perform DTC communication instead of the

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d. The terminals on connectors for the CAN J/C.
TERMINAL AND TERMINAL SYMBOL
e. WIRING DIAGRAM FOR IDENTIFYING CAN J/C CONNECTORS (w/ LEXUS Navigation
System).
TerminalTerminal symbol
1CANH
2CANL

Fig. 14: Wiring Diagram For Identifying Can J/C Connectors (W/ Lexus Navigation System)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
f. WIRING DIAGRAM FOR IDENTIFYING CAN J/C CONNECTORS
(w/o LEXUS Navigation System).

Fig. 15: Wiring Diagram For Identifying Can J/C Connectors ( (W/O Lexus Navigation
System))
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CIRCUIT DESCRIPTION
When any DTC for the CAN communication system is output, first measure the resistance between the
terminals of the DLC3 to specify the trouble area, and check that there is no short in the CAN main bus line,
between the CAN bus lines, to +B, or to GND.
WIRING DIAGRAM
U0145Lost Communication With Body Control Module "E"
U1101Lost Communication With Distance Control ECU

Fig. 31: Wiring Diagram - Can Bus Line (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 32: Wiring Diagram - Can Bus Line (2 Of 2)
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INSPECTION PROCEDURE
1.CHECK CAN BUS LINE (MAIN BUS LINE FOR DISCONNECTION, BUS LINES FOR SHORT
CIRCUIT)

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