DTC C1A4A: Skid Control Buzzer Circuit [08/2015 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Pre-Collision 2 / Active Test.
5. Perform Active Test according to the display on the Techstream.
   PRE-COLLISION 2
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   PCS Crash Alarm Buzzer	Skid control buzzer assembly	ON or OFF	Buzzer can be heard
   PCS Approach Alarm Buzzer	Skid control buzzer assembly	ON or OFF	Buzzer can be heard

   Result

   Result	Proceed to
   Skid control buzzer assembly does not sound	A
   Skid control buzzer assembly sounds	B

B → Refer to   8 

A: Go to next step 

1. Remove the skid control buzzer assembly. Refer to REMOVAL [08/2015 - ] .
2. Inspect the skid control buzzer assembly. Refer to INSPECTION [08/2015 - ] .

NG → Refer to   9 

OK: Go to next step 

1. Disconnect the skid control buzzer assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   L46-2 (IG1) - Body ground	Power switch on (IG)	11 to 14 V
   L46-2 (IG1) - Body ground	Power switch off	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control Buzzer Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the skid control buzzer assembly connector.
2. Disconnect the millimeter wave radar sensor assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L46-1 (BZ) - A70-10 (BZ)	Always	Below 1 Ω
   L46-1 (BZ) or A70-10 (BZ) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the millimeter wave radar sensor assembly with a new one. Refer to REMOVAL [08/2015 - ] .

NEXT: Go to next step 

1. Perform millimeter wave radar sensor assembly adjustment. Refer to ADJUSTMENT [08/2015 - ] .

NEXT: Go to next step 

1. Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
3. Recheck for DTCs.

   OK

   DTC C1A4A is not output.

NG → Refer to   8 

OK → END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)