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

1. Connect the Techstream to the DLC3.
2. Turn the engine 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 → See step   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 → See step   9 

OK: Go to next step 

1. Disconnect the I190 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
   I190-2 (IG1) - Body ground	Engine switch on (IG)	11 to 14 V
   I190-2 (IG1) - Body ground	Engine switch off	Below 1 V

   TEXT IN ILLUSTRATION
   
   

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

3. Reconnect the I190 skid control buzzer assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the I190 skid control buzzer assembly connector.
2. Disconnect the A85 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
   I190-1 (BZ) - A85-10 (BZ)	Always	Below 1 Ω
   I190-1 (BZ) or A85-10 (BZ) - Body ground	Always	10 kΩ or higher

4. Reconnect the A85 millimeter wave radar sensor assembly connector.
5. Reconnect the I190 skid control buzzer assembly connector.

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. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
4. Make sure that the DTC detection conditions are met.

   HINT: 

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

5. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
6. Check for DTCs.

   OK

   DTC C1A4A is not output.

NG → See step   8 

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