2003 LEXUS LS430 Factory Repair Manual

Page 2593 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 64: Signal Waveform Graph 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
OK: REPLACE CRUISE CONTROL ECU ASSY (SEE REPLACEMENT
 )  
CIRCUIT DESCRIPTION 
The millimeter wave radar sensor and cruise

Page 2594 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 65: DTC U1102 Problem Symptom Diagnostic Chart 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
WIRING DIAGRAM 
Fig. 66: Wiring Diagram 
- Lost Communication With Radar Sensor 
Courtesy of TOYOTA M

Page 2595 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 67: Disconnecting Distance Control ECU Connector 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Page 2596 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 68: Disconnecting Millimeter Wave Radar Sensor Connector 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR  
OK: Go To Next Step.  
2.INSPECT CRUISE C

Page 2597 of 4500

LEXUS LS430 2003  Factory Repair Manual CRUISE CONTROL ECU TERMINALS VOLTAGE SPECIFICATION 
d. Check the signal waveform between terminal LRRD (D2-23) of the cruise control ECU (distance 
control ECU) and body ground. 
OK:  
A waveform simi

Page 2598 of 4500

LEXUS LS430 2003  Factory Repair Manual Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 70: Signal Waveform Graph
 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
OK: REPLACE MILLIMETER WAVE RADAR SENSOR ASSY (SEE ADJUSTMENT
 )  
CIRCUIT D

Page 2599 of 4500

LEXUS LS430 2003  Factory Repair Manual Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT: 
If the beam axis deviates to the distance 4.0 to 6.0 m, upper/lower side +/-2° or more and/or the right/left side 
+/-4° or more, this DTC is dete

Page 2600 of 4500

LEXUS LS430 2003  Factory Repair Manual Fig. 73: DTC U0123 Problem Symptom Diagnostic Chart 
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 
INSPECTION PROCEDURE 
HINT: 
This circuit uses CAN for communication. Therefore, if there are any mal