Lexus ES: 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. |
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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
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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.
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PROCEDURE
| 1. | INSPECT SPIRAL CABLE SUB-ASSEMBLY |
(a) Remove the spiral cable sub-assembly.
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(b) Inspect the spiral cable sub-assembly.
Click here
| NG | .gif) | REPLACE SPIRAL CABLE SUB-ASSEMBLY |
|
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| 2. | INSPECT FORWARD RECOGNITION CAMERA (WAVEFORM) |
(a) Turn the power switch off.
(b) Disconnect the G81 spiral cable sub-assembly connector.
(c) Turn the power switch on (IG).
| (d) Using an oscilloscope, measure the waveform at G81 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 G81 spiral cable sub-assembly connector.
| NG | | GO TO STEP 5 |
|
| 3. | CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - POWER SOURCE) |
(a) Disconnect the G81 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 |
|---|---|---|
| G81-4 (BHT) - Body ground | Power switch on (IG) | 11 to 14 V |
(c) Connect the G81 spiral cable sub-assembly connector.
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - POWER SOURCE) |
|
| 4. | CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND) |
(a) Turn the power switch off.
(b) Disconnect the G81 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 |
|---|---|---|
| G81-2 (EHT) - Body ground | Always | Below 1 Ω |
(d) Connect the G81 spiral cable sub-assembly connector.
| OK | | REPLACE STEERING VIBRATION ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND) |
| 5. | CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA) |
(a) Turn the power switch off.
(b) Disconnect the P5 forward recognition camera connector.
(c) Disconnect the G81 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 |
|---|---|---|
| G81-1 (LDA) - P5-2 (STRV) | Always | Below 1 Ω |
| G81-1 (LDA) or P5-2 (STRV) - Body ground | Power switch off | 10 kΩ or higher |
(e) Connect the G81 spiral cable sub-assembly connector.
(f) Connect the P5 forward recognition camera connector.
| OK | | REPLACE FORWARD RECOGNITION CAMERA |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA) |
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CAUTION / NOTICE / HINT NOTICE:
Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.
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