2003 LEXUS LS430 Identifying ac

OK: Go to next step
3.INSPECT TRANSMISSION CONTROL SWITCH
a. Measure resistance between each terminal of shift lock control unit assy when the shift lever is
moved to each position.
Fig. 193: Identifying Transmission Control Switch Connector Terminals

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Standard:

Fig. 195: Identifying ECM Connector Terminals
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Standard:
Fig. 196: Transmission Control Switch Reference Chart

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c. Turn the ignition switch to the LOCK position.
d. Disconnect the ECM connector.

Fig. 200: Identifying Pattern Select Switch Connector Terminals
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Standard:
PATTERN SELECT SWITCH NO. 1 - BODY GROUND - RESISTANCE TABLE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See ELECTRONIC CIRCUIT
INSPECTION PROCEDURE )
OK: Go to next step
Tester ConnectionSpecified Condition
1 - Body groundBelow 1 ohms

2.INSPECT PATTERN SELECT SWITCH ASSY NO. 1
a. Measure the resistance according to the value(s) in the table below.
Fig. 201: Identifying Pattern Select Switch Terminals

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Standard:

Fig. 204: Identifying Passenger Side Junction Block Assy
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See ELECTRONIC CIRCUIT
INSPECTION PROCEDURE )
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
PATTERN SELECT SWITCH CIRCUIT (SNOW)
CIRCUIT DESCRIPTION
Passenger side J/B ECU receives pattern select switch information, and sends it through the multiplex
communication system and CAN system to the ECM.
ECT SNOW is the system that operates the throttle motor to control engine output to reduce skidding of the
driving wheels, guarantee takeoff acceleration, driving straightness and turning stability.
WIRING DIAGRAM

a. Disconnect the connector of pattern select switch.
b. Measure the resistance according to the value(s) in the table below.
Fig. 206: Identifying Pattern Select Switch Connector Terminals

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Standard:
PATTERN SELECT SWITCH NO. 1 - BODY GROUND - RESISTANCE TABLE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See ELECTRONIC CIRCUIT
INSPECTION PROCEDURE )
Tester ConnectionSpecified Condition
1 - Body groundBelow 1 ohms

Fig. 210: Identifying Passenger Side Junction Block Assy
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See ELECTRONIC CIRCUIT
INSPECTION PROCEDURE )
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE

Fig. 1: Identifying Components Location Emission Control System
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SYSTEM DIAGRAM
Fig. 2: System Diagram Emission Control System (1 Of 4)

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