Identifying condition LEXUS LS430 2003 Factory User Guide

TESTER CONNECTION SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND TERMINAL - BODY
GROUND)
Fig. 92: Identifying Skid Control ECU Connector Terminals

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OK: CHECK AND REPAIR HARNESS AND CONNECTOR (IG1 TERMINAL - BATTERY)
CIRCUIT DESCRIPTION
Master c
ylinder pressure sensor is connected to the skid control ECU in the actuator.
Tester ConnectionSpecified Condition
S42-32 (GND) - Body groundBelow 1ohms

Fig. 95: Identifying Skid Control ECU Connector Terminals
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CIRCUIT DESCRIPTION
Recognition of brake operation by sending stop lamp signal to skid control ECU.
Fig. 96: DTC C1249/49 Detecting Condition And Trouble Area

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WIRING DIAGRAM

Fig. 101: Identifying Stop Lamp Switch Assy Connector Terminals
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NG: REPLACE STOP LAMP SWITCH ASSY
OK: Go to next step
7.CHECK HARNESS AND CONNECTOR (STOP LAMP SWITCH - DRIVER SIDE J/B ECU)
a. Disconnect the stop lamp switch connector and driver side J/B connector.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
c. Measure the resistance according to the value (s) in the table below.
Standard:
Tester ConnectionSpecified Condition
(S19-1) - D3-13 (STP-1)Below 1 ohms

Fig. 102: Identifying Stop Lamp Switch Connector And Driver Side J/B Connector Terminals
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
8.CHECK HARNESS AND CONNECTOR (STPA OF DRIVER SIDE J/B ECU - STP OF SKID
CONTROL ECU)
a. Disconnect the driver side J/B connector and skid control ECU connector.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
Standard:
TESTER CONNECTION SPECIFIED CONDITION
Tester ConnectionSpecified Condition
D5-3 (STPA) - S42-27 (STP)Below 1 ohms
Tester ConnectionSpecified Condition
S42-27 (STP) - Body ground1 Mohms or higher

b. Disconnect the brake fluid level warning switch connector.
c. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
NG: REPLACE BRAKE FLUID LEVEL WARNING SWITCH
Fig. 124: Identifying Brake Fluid Level Warning Switch Terminals

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OK: Go to next step
7.CHECK HARNESS OR CONNECTOR (BRAKE FLUID LEVEL WARNING SWITCH SKID
CONTROL ECU)
Tester ConnectionSwitch ConditionSpecified Condition
(B1-1) - (B1-2)Float UP1M ohms or higher
(B1-1) - (B1-2)Float DOWNBelow 1 ohms

Fig. 128: Identifying TRAC Control Switch Terminals
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OK: Go to next step
5.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - TRAC OFF SWITCH)
a. Disconnect the skid control ECU connector and the TRAC control switch connector.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
Tester ConnectionSpecified Condition

Fig. 133: Identifying Skid Control ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
c. Measure the resistance accordin
g to the value (s) in the table below.
Tester ConnectionSpecified Condition
S42-30 (BZ) - V7-1 (BZ)Below 1 ohms

OK: Go to next step
4.INSPECT HARNESS AND CONNECTOR (DLC3 - BODY GROUND)
a. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig. 137: Identifying DLC3 Terminals (3 Of 3)

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OK: Go to next step
5.CHECK CAN COMMUNICATION SYSTEM
a. Is the DTC output for CAN communication s
ystem?
Tester ConnectionSpecified Condition
D1-4 (CG) - Body ground)Below 1 ohms

Fig. 139: Identifying DLC3 Terminals
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OK: Go to next step
2.CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND)
a. Disconnect the skid control ECU connector.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
c. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
Tester ConnectionSpecified Condition
S42-24 (TS) - D1-12 (TS)Below 1 ohms

3.CHECK HARNESS AND CONNECTOR (BODY GROUND - DLC3)
a. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig. 141: Identifying DLC3 Terminals

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OK: Go to next step
4.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - DLC3)
Tester ConnectionSpecified Condition
D1-4 (CG) - Body groundBelow 1 ohms