DTC C1A4A-12: Buzzer Circuit Short to Battery [09/2020 - ]: Procedure

1. Clear the DTCs.

   Chassis > Front Recognition Camera > Clear DTCs 

2. Perform the Active Test according to the display on the Techstream.
   NOTE:

   Perform the Active Test for 3 seconds or more.

   HINT: 

   Performing the Active Test for 3 seconds or more causes DTC C1A4A-12 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

   Body Electrical > Pre-Collision System > Active Test 

   Tester Display
   PCS Warning Buzzer

3. Check for DTCs.

   Chassis > Front Recognition Camera > Trouble Codes 

   Result

   Result	Proceed to
   DTC C1A4A-12 is not output	A
   DTC C1A4A-12 is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 09/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2022 - ] 

Result: 

B 

See step  2

1. Disconnect the K41 skid control buzzer connector.
2. Disconnect the S18 forward recognition camera connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   K41-1 (BZ) or S18-8 (BZ) - Body ground	Always	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Refer to INSPECTION [10/2016 - ]

Result

Result: 

OK 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [09/2020 - ] 

Result: 

NG 

REPLACE SKID CONTROL BUZZER. Refer to  REMOVAL [10/2016 - ]