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
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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 |
|
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| 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 |
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Installation
INSTALLATION CAUTION / NOTICE / HINT NOTICE:
When the brake pedal is first depressed after replacing the brake pads or pushing back the disc brake piston, DTC C1214 may be output. As there is no malfunction, clear the DTC.
While the auxiliary battery is connected, even if the power switch is of
