Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Lost Communication with ECM/PCM "A" Missing Message (U010087,U012587,U012687,U012987)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Vehicle Interior / Pre-collision / Pre-collision System / Lost Communication with ECM/PCM "A" Missing Message (U010087,U012587,U012687,U012987)

DESCRIPTION

When a malfunction is detected between various ECUs and sensors, these DTCs are stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U010087

Lost Communication with ECM/PCM "A" Missing Message

While the vehicle is being driven at 5 km/h (4 mph) or more, a communication error between the ECM and the forward recognition camera is detected for approximately 6 seconds or more.

CAN communication system

U012587

Lost Communication with Multi-axis Acceleration Sensor Module Missing Message
  • While the vehicle is being driven at 5 km/h (4 mph) or more, a communication error between the yaw rate sensor (airbag sensor assembly) and the forward recognition camera is detected for approximately 4 seconds or more.
  • While the vehicle is being driven at 5 km/h (4 mph) or more, a communication error between the yaw rate sensor assembly and the forward recognition camera is detected for approximately 4 seconds or more.

CAN communication system

U012687

Lost Communication with Steering Angle Sensor Module Missing Message

3 seconds or more after the engine switch is turned on (IG), a communication error between the steering sensor and the forward recognition camera is detected for approximately 1 second or more.

CAN communication system

U012987

Lost Communication with Brake System Control Module Missing Message

3 seconds or more after the engine switch is turned on (IG), a communication error between the skid control ECU (brake actuator assembly) and the forward recognition camera is detected for approximately 1 second or more.

CAN communication system

PROCEDURE

1.

CHECK FOR DTCs

(a) Clear the DTCs.

Body Electrical > Pre-Collision System > 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.

Body Electrical > Pre-Collision System > Trouble Codes

Result

Proceed to

DTC U010087, U012587, U012687 and U012987 are not output

A

DTC U010087, U012587, U012687 or U012987 is output

B
A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM

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    Lost Communication with Cruise Control Front Distance Range Sensor Missing Message (U023587)
    DESCRIPTION The forward recognition camera and millimeter wave radar sensor assembly communicate via CAN communication. If a signal is not received from the millimeter wave radar sensor assembly, the ...

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