DTC C1AA7: Skid Control Buzzer Circuit [11/2015 - 06/2017]: Procedure

1. Check the operating condition of the pre-collision city buzzer.
   RESULT
   
   

   Result	Proceed to
   The pre-collision city buzzer is not sounding.	A
   The pre-collision city buzzer is sounding.	B

Result: 

B 

See step  5

Result: 

A 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Chassis > PCS/LDA/RSA/LVN > Active Test.
5. Perform the Active Test according to the display on the Techstream (Refer to DATA LIST / ACTIVE TEST [11/2015 - 06/2017] ).
   CHASSIS > PCS/LDA/RSA/LVN > ACTIVE TEST
   
   

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   PCS Buzzer Request	Sound pre-collision city buzzer	ON/OFF	Test possible with power switch on (IG) and vehicle stopped

6. Check that the pre-collision city buzzer sounds when the Active Test "PCS Buzzer Request" is set to ON.

   OK

   The pre-collision city buzzer sounds.

Result: 

NG 

See step  4

Result: 

OK 

See step  3

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Chassis / PCS/LDA/RSA/LVN / Trouble Codes.
5. Clear the DTCs (Refer to DTC CHECK / CLEAR [11/2015 - ] ).
6. Enter the following menus: Chassis > PCS/LDA/RSA/LVN > Active Test.
7. Perform the Active Test according to the display on the Techstream (Refer to DATA LIST / ACTIVE TEST [11/2015 - 06/2017] ).
   CHASSIS > PCS/LDA/RSA/LVN > ACTIVE TEST
   
   

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   PCS Buzzer Request	Sound pre-collision city buzzer	ON/OFF	Test possible with power switch on (IG) and vehicle stopped

8. Check for DTCs (Refer to DTC CHECK / CLEAR [11/2015 - ] ).
   RESULT
   
   

   Result	Proceed to
   DTC C1A47 is not output	A
   DTC C1A47 is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] )

Result: 

8 

REPLACE PRE-COLLISION CITY SENSOR 

Refer to COMPONENTS [11/2015 - ] )

1. Disconnect the G93 pre-collision city buzzer connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *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	Condition	Specified Condition
   G93-2 (IG1) - Body ground	Power switch is on (IG)	11 to 14 V
   G93-2 (IG1) - Body ground	Power switch off	Below 1 V

3. Connect the G93 pre-collision city buzzer connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

Result: 

OK 

See step  5

1. Disconnect the G93 pre-collision city buzzer connector.
2. w/o Sliding Roof:

   Disconnect the Q7 pre-collision city sensor connector.

3. w/ Sliding Roof:

   Disconnect the Q8 pre-collision city sensor connector.

4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G93-1 (BZ) - Q7-8 (BUZ) *1 G93-1 (BZ) - Q8-8 (BUZ) *2	Always	Below 1 Ω
   G93-1 (BZ) - Body ground	Always	10 kΩ or higher

   • *1: w/o Sliding Roof
   • *2: w/ Sliding Roof
5. w/o Sliding Roof:

   Connect the Q7 pre-collision city sensor connector.

6. w/ Sliding Roof:

   Connect the Q8 pre-collision city sensor connector.

7. Connect the G93 pre-collision city buzzer connector.

Result: 

NG 

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

Result: 

OK 

See step  6

1. Remove the pre-collision city buzzer (Refer to REMOVAL [11/2015 - 06/2017] ).
2. Inspect the pre-collision city buzzer (Refer to INSPECTION [11/2015 - 06/2017] ).

Result: 

OK 

REPLACE PRE-COLLISION CITY SENSOR 

Refer to COMPONENTS [11/2015 - ] )

Result: 

NG 

REPLACE PRE-COLLISION CITY BUZZER 

Refer to COMPONENTS [11/2015 - 06/2017] )