Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Lost Communication with ECM/PCM "A" Missing Message (U010087,U012587,U012687,U012987)

Lexus RX (RX 350L, RX450h) 2016-2025 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

    Stop Light Relay Actuator Stuck (C142571)
    DESCRIPTION The skid control ECU (brake actuator assembly) sends a stop light operation request signal to the stop light relay (semiconductor PWR integration ECU). If the skid control ECU (brake actua ...

    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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