2003 LEXUS LS430 Identifying condition

TELEVISION CAMERA ECU CONNECTOR TERMINALS RESISTANCE
Fig. 22: Identifying ECM Connector Terminals

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8.ECM
a. Measure the resistance according to the value (s) in the table below.
Standard:
ECM CONNECTOR TERMINALS RESISTANCE
TerminalsWiring ColorConditionSpecified Condition
T24-8 (CANH) - T24-7 (CANL)LG - LIgnition Switch OFF54 to 69 ohms
T24-8 (CANH) - T25-8 (GND1)LG - W-BIgnition Switch OFF1 kohms or more
T24-7 (CANL) - T25-8 (GND1)L - W-BIgnition Switch OFF1 kohms or more
T24-8 (CANH) - T25-1 (+B)LG - RIgnition Switch OFF1 Mohms or more
T24-7 (CANL) - T25-1 (+B)L - RIgnition Switch OFF1 Mohms or more
TerminalsWiring ColorConditionSpecified Condition
E3-25 (CANH) - E3-24 (CANL)R- WIgnition Switch OFF54 to 69 ohms
E3-25 (CANH) - E3-2 (EC)R - W-BIgnition Switch OFF1 kohms or more
E3-24 (CANL) - E3-2 (EC)W - W-BIgnition Switch OFF1 kohms or more

Standard:
Fig. 23: Identifying Gateway ECU Connector Terminals

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9.GATEWAY ECU
a. Measure the resistance according to the value (s) in the table below.
GATEWAY ECU CONNECTOR TERMINALS RESISTANCE
E3-25 (CANH) - E3-4 (BATT)R - B-RIgnition Switch OFF1 Mohms or more
E3-24 (CANL) - E3-4 (BATT)W - B-RIgnition Switch OFF1 Mohms or more
TerminalsWiring ColorConditionSpecified Condition
G3-17 (CA1H) - G3-18 (CA1L)LG - LIgnition Switch OFF54 to 69 ohms
G3-17 (CA1H) - G3-24 (GND)LG - W-BIgnition Switch OFF1 kohms or more
G3-18 (CA1L) - G3-24 (GND)L - W-BIgnition Switch OFF1 kohms or more
G3-17 (CA1H) - G3-10 (BATT)LG - L-YIgnition Switch OFF1 Mohms or more
G3-18 (CA1L) - G3-10 (BATT)L - L-YIgnition Switch OFF1 Mohms or more

10.SUSPENSION CONTROL ECU
a. Measure the resistance according to the value (s) in the table below.
Standard:
SUSPENSION CONTROL ECU CONNECTOR TERMINALS RESISTANCE
Fig. 25: Identifying Seat Belt Control ECU Connector Terminals

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11.SEAT BELT CONTROL ECU
a. Measure the resistance according to the value (s) in the table below.
Standard:
TerminalsWiring ColorConditionSpecified Condition
A20-7 (CANH) - A20-8 (CANL)BR - YIgnition Switch OFF54 to 69 ohms
A20-7 (CANH) - A20-4 (GND)BR - W-BIgnition Switch OFF1 kohms or more
A20-8 (CANL) - A20-4 (GND)Y - W-BIgnition Switch OFF1 kohms or more
A20-7 (CANH) - D1-16 (BAT)BR - BIgnition Switch OFF1 Mohms or more
A20-8 (CANL) - D1-16 (BAT)Y - BIgnition Switch OFF1 Mohms or more

Fig. 33: Identifying DLC3 Connector terminals
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a. Turn the ignition switch to the LOCK position.
b. Measure the resistance according to the value (s) in the table below.
Standard:
ECM CONNECTOR TERMINALS RESISTANCE
Tester connectionConditionSpecified valueResult
D1-6 (CANH) - D1-14
(CANL)Ignition Switch
OFF54 to 69 ohmsOK
D1-6 (CANH) - D1-14
(CANL)Ignition Switch
OFF69 ohms or more (w/o LEXUS Navigation
system)NG-A
D1-6 (CANH) - D1-14
(CANL)Ignition Switch
OFF69 ohms or more (w/ LEXUS Navigation
System)NG-B
D1-6 (CANH) - D1-14
(CANL)Ignition Switch
OFF54 ohms or less (w/o LEXUS Navigation
System)NG-C

Fig. 35: Identifying DLC3 Connector terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Measure the resistance according to the value (s) in the table below.
Standard:
ECM CONNECTOR TERMINALS RESISTANCE
HINT:
NG-A: w/o LEXUS Navigation System.
NG-B: w/ LEXUS Navigation System.
NG-A: CHECK CAN BUS LINE FOR SHORT TO GND (W/O LEXUS NAVIGATION SYSTEM)
Tester ConnectionConditionSpecified value
D1-4 (CG) - D1-6 (CANH)Ignition Switch OFF1 kohms or more
D1-4 (CG) - D1-14 (CANL)Ignition Switch OFF1 kohms or more

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

Fig. 46: Identifying Yaw Rate Sensor Connector
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a. Turn the ignition switch to the LOCK position.
b. Disconnect the yaw rate sensor connector (Y1).
c. Measure the resistance according to the value (s) in the table below.
Standard:
YAW RATE SENSOR CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H,
CAN-L)
OK: GO TO NEXT STEP
2.CHECK WIRE HARNESS (IG, GND)
Tester connectionConditionSpecified value
Y1-2 (CANL) - Y1-3 (CANH)Ignition Switch OFF54 to 69 ohms

Fig. 47: Identifying Yaw Rate Sensor Connector
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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:
YAW RATE SENSOR CONNECTOR TERMINALS RESISTANCE AND VOLTAGE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE YAW RATE SENSOR (SEE REPLACEMENT
)
Tester ConnectionConditionSpecified Condition
Y1-1 (GND) - Body groundAlwaysBelow 1 ohms
Y1-5 (IG) - Body groundIgnition Switch ON10 to 14 V