Page 2897 of 4500
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 SALES, U.S.A., INC.
Standard:
Page 2898 of 4500
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 (PATTERN SELECT SWITCH ASSY NO. 1 -
MULTIPLEX NETWORK BODY ECU)
a. Connect the connector of pattern select switch.
b. Disconnect the passenger side junction block assy (multiplex network body ECU) connector.
c. Measure the resistance between terminal PWR of passenger side junction block assy (multiplex
network body ECU) and body ground.
Standard:
Fig. 203: Pattern Select Switch Reference Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Page 2899 of 4500
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: 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
Page 2900 of 4500
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 "OFF" (Normal drive mode).
c. Confirm vehicle response by driving from a parked position to fully depressing the accelerator
pedal.
d. Turn the ECT SNOW switch "ON" and perform the same check as (c).
Confirm that there is a difference between ECT SNOW switch "ON" and "OFF".
Driving test should be done on a paved road (a nonskid road).
Make sure not to use the TRAC system when testing a vehicle equipped with one.
OK:
There is a difference in acceleration between "ON" and "OFF".
NG: Go to step 2
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
2.CHECK HARNESS AND CONNECTOR (PATTERN SELECT SWITCH ASSY NO. 1 - BODY
GROUND)
Page 2901 of 4500
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
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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
Page 2902 of 4500
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
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard:
Page 2903 of 4500
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 (PATTERN SELECT SWITCH ASSY NO. 1 -
MULTIPLEX NETWORK BODY ECU)
a. Connect the connector of pattern select switch.
b. Disconnect the passenger side junction block assy (multiplex network body ECU) connector.
c. Measure the resistance between terminal SNOW of passenger side junction block assy (multiplex
network body ECU) and body ground.
Standard:
Fig. 209: Pattern Select Switch Reference Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Page 2904 of 4500
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: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE