DTC C1A4A-14: Buzzer Circuit Short to Ground or Open [01/2023 - ]: Procedure

1. Clear the DTCs.

   Chassis > Front Recognition Camera > Clear DTCs 

2. Make sure that the DTC detection conditions are met.

   HINT: 

   If the detection conditions are not met, the system cannot detect the malfunction.

3. Check for DTCs.

   Chassis > Front Recognition Camera > Trouble Codes 

   Result

   Result	Proceed to
   DTC C1A4A-14 is not output	A
   DTC C1A4A-14 is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [01/2023 - ] 

Result: 

B 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the O40 skid control buzzer assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   O40-2 (IG1) - Body ground	Engine switch on (IG)	8 to 16 V
   	Engine switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the W18 forward recognition camera connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O40-1 (BZ) - W18-8 (BZ)	Always	Below 1 Ω
   O40-1 (BZ) or W18-8 (BZ) - Body ground	Always	10 kΩ higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

Refer to INSPECTION [09/2014 - ]

Result

Result: 

OK 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [01/2023 - ] 

Result: 

NG 

REPLACE SKID CONTROL BUZZER ASSEMBLY. Refer to  REMOVAL [09/2014 - ]