Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: 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 |
|---|---|---|---|
| C1A4A14 | Buzzer Circuit Short to Ground or Open | The forward recognition camera detects an open or short to ground in the buzzer circuit for 2 seconds or more. |
|
WIRING DIAGRAM
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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) Make sure that the DTC detection conditions are met.
HINT:
If the detection conditions are not met, the system cannot detect the malfunction.
(c) Check for DTCs.
Chassis > Front Recognition Camera > Trouble Codes| Result | Proceed to |
|---|---|
| DTC C1A4A14 is not output | A |
| DTC C1A4A14 is output | B |
| A | .gif) | USE SIMULATION METHOD TO CHECK |
|
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| 2. | CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER ASSEMBLY POWER SOURCE CIRCUIT) |
| *a | Front view of wire harness connector (to Skid Control Buzzer Assembly) |
(a) Disconnect the A15 skid control buzzer assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| A15-2 (IG1) - Body ground | Engine switch on (IG) | 8 to 16 V |
| Engine switch off | Below 1 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER 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 |
|---|---|---|
| A15-1 (BZ) - U14-8 (BZ) | Always | Below 1 Ω |
| A15-1 (BZ) or U14-8 (BZ) - Body ground | Always | 10 kΩ higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | INSPECT SKID CONTROL BUZZER ASSEMBLY |
(a) Remove the skid control buzzer assembly.
Click here
(b) Inspect the skid control buzzer assembly.
Click here
| OK | | REPLACE FORWARD RECOGNITION CAMERA |
| NG | | REPLACE SKID CONTROL BUZZER ASSEMBLY |
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DESCRIPTION If the forward recognition camera detects a short to +B in the buzzer circuit, it will store DTC C1A4A12. DTC No. Detection Item DTC Detection Condition Trouble Area C1A4A12 ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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