2003 LEXUS LS430 Factory Repair Manual

Page 2897 of 4500

LEXUS LS430 2003  Factory Repair Manual 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
 
Courtesy of TOYOTA MOTOR SA

Page 2898 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 202: Pattern Select Switch Reference Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: REPLACE PATTERN SELECT SWITCH ASSY NO. 1  
OK: Go to next step  
3.CHECK HARNESS AND CONNECTOR (PATTER

Page 2899 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 204: Identifying Passenger Side Junction Block Assy 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See ELECTRONIC CIRCUIT 
INSPECTION PROCEDURE )  
OK:

Page 2900 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 205: Pattern Select Switch Circuit (SNOW) - Wiring Diagram 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
INSPECTION PROCEDURE 
1.DRIVING TEST 
a. Start the engine.  
b. Turn the ECT SNOW switch

Page 2901 of 4500

LEXUS LS430 2003  Factory Repair Manual 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
 
Court

Page 2902 of 4500

LEXUS LS430 2003  Factory Repair Manual OK: Go to next step  
3.INSPECT PATTERN SELECT SWITCH ASSY NO. 1 
a. Measure the resistance according to the value(s) in the table below. 
Fig. 207: Inspecting Pattern Select Switch Assy No. 1
 
Court

Page 2903 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 208: Pattern Select Switch Reference Chart 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: REPLACE PATTERN SELECT SWITCH ASSY NO. 1  
OK: Go to next step  
4.CHECK HARNESS AND CONNECTOR (PATTE

Page 2904 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 210: Identifying Passenger Side Junction Block Assy 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (See ELECTRONIC CIRCUIT 
INSPECTION PROCEDURE )  
OK: