2003 LEXUS LS430 Identifying ac

Fig. 20: Identifying Distance Control ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

6.DISTANCE CONTROL ECU
a. Measure the resistance according to the value (s) in the table below.
Standard:
DISTANCE CONTROL ECU CONNECTOR TERMINALS RESISTANCE
Fig. 21: Identifying Television Camera ECU Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
7.TELEVISION CAMERA ECU
a. Measure the resistance according to the value (s) in the table below.
Standard:
TerminalsWiring ColorConditionSpecified Condition
D2-8 (CANH) - D2-9 (CANL)LG - LIgnition Switch OFF54 to 69 ohms
D2-8 (CANH) - D2-12 (GND)LG - BRIgnition Switch OFF1 kohms or more
D2-9 (CANL) - D2-12 (GND)L - BRIgnition Switch OFF1 kohms or more
D2-8 (CANH) - D1-16 (BAT)LG - BIgnition Switch OFF1 Mohms or more
D2-9 (CANL) - D1-16 (BAT)L- BIgnition Switch OFF1 Mohms or more

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

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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

Fig. 24: Identifying Suspension Control ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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

NG-A: CHECK CAN MAIN BUS LINE FOR DISCONNECTION (W/O LEXUS NAVIGATION
SYSTEM)
NG-B: CHECK CAN MAIN BUS LINE FOR DISCONNECTION (W/ LEXUS NAVIGATION
SYSTEM)
NG-C: CHECK CAN BUS LINES FOR SHORT CIRCUIT (W/O LEXUS NAVIGATION
SYSTEM)
NG-D: CHECK CAN BUS LINES FOR SHORT CIRCUIT (W/ LEXUS NAVIGATION SYSTEM)
OK: GO TO NEXT STEP
2.CHECK CAN BUS LINE FOR SHORT TO +B
Fig. 34: Identifying DLC3 Connector terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
D1-6 (CANH) - D1-14
(CANL)Ignition Switch
OFF54 ohms or less (w/ LEXUS Navigation
System)NG-D