Lexus NX: Buzzer Circuit Short to Battery (C1A4A12)
DESCRIPTION
If the forward recognition camera detects a short +B in the buzzer circuit, it will store DTC C1A4A12.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1A4A12 | Buzzer Circuit Short to Battery | While the skid control buzzer is sounding, the forward recognition camera detects a short to +B in the buzzer circuit for 3 seconds or more. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
- 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
PROCEDURE
| 1. | CHECK FOR DTCs |
(a) Clear the DTCs.
Chassis > Front Recognition Camera > Clear DTCs(b) Perform the Active Test according to the display on the Techstream.
NOTICE:
Perform the Active Test for 3 seconds or more.
HINT:
Performing the Active Test for 3 seconds or more causes DTC C1A4A12 to be stored if the DTC detection conditions are met.
Body Electrical > Pre-Collision System > Active Test| Tester Display | Measurement Item | Control Range | Diagnostic Note |
|---|---|---|---|
| PCS Warning Buzzer | Sounds the skid control buzzer | Active / Not Active | Test possible with power switch on (IG), vehicle stopped |
| Tester Display |
|---|
| PCS Warning Buzzer |
(c) Check for DTCs.
Chassis > Front Recognition Camera > Trouble Codes| Result | Proceed to |
|---|---|
| DTC C1A4A12 is not output | A |
| DTC C1A4A12 is output | B |
| A | .gif) | USE SIMULATION METHOD TO CHECK |
|
.gif)
| 2. | CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER - FORWARD RECOGNITION CAMERA) |
(a) Disconnect the I36 skid control buzzer connector.
(b) Disconnect the T18 forward recognition camera connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| I36-1 (BZ) or T18-8 (BZ) - Body ground | Power switch off | Below 1 V |
(d) Connect the T18 forward recognition camera connector.
(e) Connect the I36 skid control buzzer connector.
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL BUZZER - FORWARD RECOGNITION CAMERA) |
|
| 3. | INSPECT SKID CONTROL BUZZER |
(a) Remove the skid control buzzer.
Click here
(b) Inspect the skid control buzzer.
Click here
| OK | | REPLACE FORWARD RECOGNITION CAMERA |
| NG | | REPLACE SKID CONTROL BUZZER |
READ NEXT:
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
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 EC
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
SEE MORE:
Engine Switch/Power Switch Malfunction (C13A2)
DESCRIPTION When the power switch is turned on (IG), power is supplied to the parking brake ECU assembly. This DTC is stored if the IG power source is not input to the parking brake ECU assembly when communication with other ECUs occurs. DTC No. Detection Item DTC Detection Condition Troubl
Removal
REMOVAL CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE 1. REMOVE REAR WHEEL Click here 2. REMOVE REAR SUSPENSION ARM COVER LH Click here 3. REMOVE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY LH Click here
