LEXUS LS430 2003 Factory Repair Manual

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. 37: Wiring Diagram - Skid Control ECU Communication Stop Mode
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INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR DISCONNECTION (SKID CONTROL ECU SUB BUS LINE)

Fig. 38: Check Can Bus Line For Disconnection
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a. Turn the ignition switch to the LOCK position.
b. Disconnect the skid control ECU connector (S42).
c. Measure the resistance according to the value (s) in the table below.
Standard:
SKID CONTROL ECU CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-
H, CAN-L)
OK: GO TO NEXT STEP
2.CHECK WIRE HARNESS (IG, GND1, GND2)
Tester ConnectionConditionSpecified value
S42-11 (GANH) - S42-25 (CANL)Ignition Switch OFF54 to 69 ohms

Fig. 39: Identifying Skid Control ECU Connectors
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a. Measure the resistance according to the value (s) in the table below.
b. Measure the voltage according to the value (s) in the table below.
Standard:
SKID CONTROL ECU CONNECTOR TERMINALS VOLTAGE
NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
OK: REPLACE SKID CONTROL ECU WITH ACTUATOR (SEE REPLACEMENT
)
Tester ConnectionConditionSpecified value
S42-1 (GND2) - Body groundAlwaysBelow 1
S42-32 (GND1) - Body groundAlwaysBelow 1
S42-46 (IG1) - Body groundIgnition Switch ON10 to 14 V

MODE DESCRIPTION
Fig. 40: Problem Symptom Diagnostic Chart

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WIRING DIAGRAM
Fig. 41: Wiring Diagram
- Steering Sensor Communication Stop Mode
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INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR DISCONNECTION (STEERING SENSOR SUB BUS LINE)
Fig. 42: Disconnecting Steering Sensor Connector (S16)

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a. Turn the ignition switch to the LOCK position.
b. Disconnect the steering sensor connector (S16).
c. Measure the resistance according to the value (s) in the table below.
Standard:
STEERING SENSOR CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE STEERING SENSOR SUB BUS LINE OR CONNECTOR (CAN-H,
CAN -L)
OK: GO TO NEXT STEP
2.CHECK WIRE HARNESS (IG1, ESS)
Tester ConnectionConditionSpecified value
S16-10 (CANH) -S16-9 (CANL)Ignition Switch OFF54 to 69 ohms

Fig. 43: Disconnecting Steering Sensor Connector (S16)
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a. Measure the resistance according to the value (s) in the table below.
b. Measure the voltage according to the value (s) in the table below.
Standard:
STEERING SENSOR CONNECTOR TERMINALS RESISTANCE AND VOLTAGE
Tester ConnectionConditionSpecified condition
S16-2 (ESS) - Body groundAlwaysBelow 1 ohms
S16-1 (IG1) - Body groundIgnition Switch ON10 to 14 V

NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
OK: REPLACE STEERING SENSOR (SEE REPLACEMENT )
MODE DESCRIPTION
Fig. 44: Problem Symptom Diagnostic Chart

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WIRING DIAGRAM

Fig. 45: Wiring Diagram - Yaw Rate Sensor Communication Stop Mode
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INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR DISCONNECTION (YAW RATE SENSOR SUB BUS LINE)