Lexus NX: 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. |
|
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
.gif)
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 | .gif) | REPLACE SPIRAL CABLE SUB-ASSEMBLY |
|
.gif)
| 2. | INSPECT FORWARD RECOGNITION CAMERA (WAVEFORM) |
(a) Turn the power switch off.
(b) Disconnect the I4 spiral cable sub-assembly connector.
(c) Turn the power switch on (IG).
| (d) Using an oscilloscope, measure the waveform at I4 spiral cable sub-assembly connector. Measurement Condition:
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. |
|
(e) Connect the I4 spiral cable sub-assembly connector.
| NG | | GO TO STEP 6 |
|
| 3. | INSPECT STEERING WHEEL ASSEMBLY (WAVEFORM) |
(a) Turn the power switch off.
(b) Disconnect the A steering vibration ECU connector.
(c) Turn the power switch on (IG).
| (d) Using an oscilloscope, measure the waveform at A steering vibration ECU connector. Measurement Condition:
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. |
|
(e) Connect the A steering vibration ECU connector.
| NG | | REPLACE STEERING WHEEL ASSEMBLY |
|
| 4. | CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - POWER SOURCE) |
(a) Disconnect the I156 spiral cable sub-assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I156-4 (BHT) - Body ground | Power switch on (IG) | 11 to 14 V |
(c) Connect the I156 spiral cable sub-assembly connector.
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - POWER SOURCE) |
|
| 5. | CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND) |
(a) Turn the power switch off.
(b) Disconnect the I156 spiral cable sub-assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I156-2 (EHT) - Body ground | Always | Below 1 Ω |
(d) Connect the I156 spiral cable sub-assembly connector.
| OK | | REPLACE STEERING VIBRATION ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND) |
| 6. | CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA) |
(a) Turn the power switch off.
(b) Disconnect the T18 forward recognition camera connector.
(c) Disconnect the I4 spiral cable sub-assembly connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I4-9 (LDA) - T18-2 (STRV) | Always | Below 1 Ω |
| I4-9 (LDA) or T18-2 (STRV) - Body ground | Power switch off | 10 kΩ or higher |
(e) Connect the I4 spiral cable sub-assembly connector.
(f) Connect the T18 forward recognition camera connector.
| OK | | REPLACE FORWARD RECOGNITION CAMERA |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA) |
READ NEXT:
Front Recognition Camera Optical Axis Misalignment Malfunction (C1AA800)
DESCRIPTION If the forward recognition camera determines that the beam axis of the camera is misaligned, it stores C1AA800. DTC No. Detection Item DTC Detection Condition Trouble Area C1A
Front Recognition Camera Heater Malfunction (C1AAE00)
DESCRIPTION The forward recognition camera controls the current to the forward recognition hood with heater sub-assembly. C1AAE00 is stored when the forward recognition camera detects a forward recogn
Lost Communication with Multi-axis Acceleration Sensor Module Missing Message (U012587,U012687,U012987,U014087,U029387)
DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area U012587 Lost Communication with Multi-axis Acceleration Sensor Module Missing Message 3 seconds after the power
SEE MORE:
Installation
INSTALLATION PROCEDURE 1. INSTALL MULTIPLEX NETWORK BODY ECU (MAIN BODY ECU) NOTICE:
Make sure that no foreign matter gets on the connecting surfaces.
Do not touch the ECU connector.
(a) Insert the multiplex network body ECU (main body ECU) up to the position where it contacts the housing si
Short in Curtain Shield Airbag (LH) Squib Circuit (B1835-B1838)
DESCRIPTION The curtain shield squib LH circuit consists of the airbag ECU assembly and curtain shield airbag assembly LH. The circuit instructs the SRS to deploy when deployment conditions are met. These DTCs are stored when a malfunction is detected in the curtain shield squib LH circuit. DTC N
