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 | Buzzer Circuit Short to Battery | While the skid control buzzer assembly 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:
HINT:
Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.
One Time Recognition: Click here
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 engine 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 | ![]() | USE SIMULATION METHOD TO CHECK |
|
2. | CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER ASSEMBLY - FORWARD RECOGNITION CAMERA) |
(a) Disconnect the A15 skid control buzzer assembly connector.
(b) Disconnect the U14 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 |
---|---|---|
A15-1 (BZ) or U14-8 (BZ) - Body ground | Engine switch off | Below 1 V |
NG | ![]() | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. | 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 |
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Brake Fluid: Replacement
REPLACEMENT CAUTION / NOTICE / HINT NOTICE:
Move the shift lever to P and apply the parking brake before replacing the brake fluid.
Add brake fluid to keep the level between the MIN and MAX lines of the reservoir while replacing the brake fluid.
If brake fluid leaks onto any painted surface, ...
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Heated Steering Wheel System: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected ...