Lexus ES manuals

Lexus ES: Lost Communication with Cruise Control Module Missing Message (U010487,U012287,U029387)

Lexus ES (XZ10) Service Manual / Engine & Hybrid System / Cruise Control / Dynamic Radar Cruise Control System (for Hv Model) / Lost Communication with Cruise Control Module Missing Message (U010487,U012287,U029387)

DESCRIPTION

The hybrid vehicle control ECU communicates with each sensor and ECU via CAN communication.

If any malfunction is detected in a CAN communication circuit, one or more CAN communication system DTCs are stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

U010487

Lost Communication with Cruise Control Module Missing Message

When the power switch is on (IG) and the dynamic radar cruise control system is operating, a communication malfunction between the millimeter wave radar sensor assembly and hybrid vehicle control ECU is detected for approximately 1 second or more.

  • CAN communication system
  • Millimeter wave radar sensor assembly
  • Hybrid vehicle control ECU

Does not come on

Hybrid vehicle control ECU

U012287

Lost Communication with Vehicle Dynamics Control Module Missing Message

When the power switch is on (IG) and the dynamic radar cruise control system is operating, a communication malfunction between the skid control ECU (brake booster with master cylinder assembly) and hybrid vehicle control ECU is detected for approximately 2.6 seconds or more.

  • CAN communication system
  • Skid control ECU (brake booster with master cylinder assembly)
  • Hybrid vehicle control ECU

Does not come on

Hybrid vehicle control ECU

U029387

Lost Communication with Hybrid Powertrain Control Module Missing Message

When the dynamic radar cruise control system is operating, a communication malfunction between the skid control ECU (brake booster with master cylinder assembly) and hybrid vehicle control ECU is detected for approximately 1 second or more.

  • CAN communication system
  • Skid control ECU (brake booster with master cylinder assembly)
  • Hybrid vehicle control ECU

Does not come on

Hybrid vehicle control ECU

PROCEDURE

1.

CHECK FOR DTCs

(a) Clear the DTCs.

Powertrain > Radar Cruise1 > Clear DTCs

(b) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

(c) Check for DTCs.

Powertrain > Radar Cruise1 > Trouble Codes

Result

Proceed to

DTC U010487, U012287 and U029387 are not output

A

DTC U010487, U012287 or U029387 is output

B

A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM

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SEE MORE:

 Parts Location

PARTS LOCATION ILLUSTRATION *1 FRONT TELEVISION CAMERA ASSEMBLY *2 BRAKE ACTUATOR ASSEMBLY - SKID CONTROL ECU *3 SIDE TELEVISION CAMERA ASSEMBLY RH *4 SIDE TELEVISION CAMERA ASSEMBLY LH *5 ECM *6 PARK/NEUTRAL POSITION SWITCH ASSEMBLY *7 REAR TELEVISION CAMERA ASSE

 Terminals Of Ecu

TERMINALS OF ECU CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (a) Disconnect the MB main body ECU (multiplex network body ECU) connector. Click here (b) Measure the voltage and resistance according to the value(s) in the table below. HINT: Measure

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