Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Steering Vibrator System Missing Message (C1A7587)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Engine & Hybrid System / Cruise Control / Front Camera System / Steering Vibrator System Missing Message (C1A7587)

DESCRIPTION

The forward recognition camera communicates with the steering vibration ECU via LIN communication.

If a communication error between the forward recognition camera and steering vibration ECU is detected, DTC C1A7587 is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1A7587

Steering Vibrator System Missing Message

While the vehicle is being driven at 5 km/h (4 mph) or more and the lane control system is on, a LIN communication error is detected between the steering vibration ECU and forward recognition camera for approximately 5 minutes or more.
  • Forward recognition camera
  • Steering vibration ECU
  • Wire harness or connector
  • Spiral cable sub-assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera adjustment.

    HINT:

    Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.

    One Time Recognition: Click here

    Sequential Recognition: Click here

  • The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

    Click here

PROCEDURE

1.

INSPECT SPIRAL CABLE SUB-ASSEMBLY

(a) Remove the spiral cable sub-assembly.

Click here

(b) Inspect the spiral cable sub-assembly.

Click here

NG

REPLACE SPIRAL CABLE SUB-ASSEMBLY

OK

2.

INSPECT FORWARD RECOGNITION CAMERA (WAVEFORM)

(a) Turn the engine switch on (IG).

(b) Using an oscilloscope, measure the waveform at the J29 spiral cable sub-assembly connector.

Measurement Condition:

Tester Connection

Condition

Tester Range

J29-9 (LDA) - Body ground

Engine switch on (IG)

5 V/DIV., 1 ms/DIV.

NOTICE:

The oscilloscope waveform is for reference only and does not include noise, fluctuations, etc.

OK:

A waveform similar to that in the illustration can be observed.
NG

GO TO STEP 5

OK

3.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - POWER SOURCE)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

J23-4 (BHT) - Body ground

Engine switch on (IG)

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

J23-2 (EHT) - Body ground

Always

Below 1 Ω
OK

REPLACE STEERING VIBRATION ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA)

(a) Disconnect the U14 forward recognition camera connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

J29-9 (LDA) - U14-2 (STRV)

Always

Below 1 Ω

J29-9 (LDA) or U14-2 (STRV) - Body ground

Engine switch off

10 kΩ or higher
OK

REPLACE FORWARD RECOGNITION CAMERA

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Buzzer Circuit Short to Ground or Open (C1A4A14)
    DESCRIPTION If the forward recognition camera detects an open or short to ground in the buzzer circuit, it will store DTC C1A4A14. DTC No. Detection Item DTC Detection Condition Trouble Area ...

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