DTC C1A4A-14: Buzzer Circuit Short to Ground or Open [05/2023 - ]: 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 [07/2020 - ] 

Result: 

B 

See step  2

1. Disconnect the P61 pre-collision city buzzer connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Pre-collision City Buzzer)

2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   P61-2 (IG1) - Body ground	Engine switch on (IG)	11 to 14 V
   	Engine switch off	Below 1 V

3. Connect the P61 pre-collision city buzzer connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (PRE-COLLISION CITY BUZZER - BATTERY) 

Result: 

OK 

See step  3

1. Disconnect the P61 pre-collision city buzzer connector.
2. Disconnect the Z6 forward recognition camera connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P61-1 (BZ) - Z6-8 (BZ)	Always	Below 1 Ω
   P61-1 (BZ) or Z6-8 (BZ) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL BUZZER - FORWARD RECOGNITION CAMERA) 

Result: 

OK 

See step  4

Refer to INSPECTION [05/2023 - ]

Result

Result: 

OK 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [05/2023 - ] 

Result: 

NG 

REPLACE PRE-COLLISION CITY BUZZER. Refer to  REMOVAL [05/2023 - ]