DTC C1AA7: Skid Control Buzzer Circuit [08/2017 - 08/2019]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [08/2017 - 08/2019]

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

   Refer to DATA LIST / ACTIVE TEST [08/2017 - 08/2019]

   NOTE:

   Perform the Active Test for 1 second or more.

   HINT: 

   Performing the Active Test for 1 second or more causes DTC C1AA7 to be stored if the DTC detection conditions are met.

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   PCS Buzzer	Skid control buzzer	ON / OFF	Test possible with ignition switch ON, vehicle stopped

3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [08/2017 - 08/2019]

   Result

   Result	Proceed to
   DTC C1AA7 is not output	A
   DTC C1AA7 is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2017 - 08/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2018 - 08/2019] 

Result: 

B 

See step  2

1. Disconnect the Skid control buzzer connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   H135-2 (IG1) - Body ground	Ignition switch ON	11 to 14 V
   	Ignition switch off	Below 1 V

3. Connect the Skid control buzzer connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL BUZZER - BATTERY) 

Result: 

OK 

See step  3

1. Disconnect the H135 skid control buzzer connector.
2. Disconnect the U22 forward recognition camera connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H135-1 (BZ) - U22-8 (BZ)	Always	Below 1 Ω
   H135-1 (BZ) or U22-8 (BZ) - Body ground	Always	10 kΩ or higher

4. Connect the U22 forward recognition camera connector.
5. Connect the H135 skid control buzzer connector.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

See step  6

Result: 

NG 

See step  4

1. Repair or replace the harness or connector.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [08/2017 - 08/2019]

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

   Refer to DATA LIST / ACTIVE TEST [08/2017 - 08/2019]

   NOTE:

   Perform the Active Test for 1 second or more.

   HINT: 

   Performing the Active Test for 1 second or more causes DTC C1AA7 to be stored if the DTC detection conditions are met.

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   PCS Buzzer	Skid control buzzer	ON / OFF	Test possible with ignition switch ON, vehicle stopped

3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [08/2017 - 08/2019]

   Result

   Result	Proceed to
   DTC C1AA7 is not output	A
   DTC C1AA7 is output	B

Result: 

A 

END 

Result: 

B 

See step  6

1. Turn the ignition switch to ON.
2. Check if the skid control buzzer is sounding.

   Result

   Result	Proceed to
   The skid control buzzer does not sound when the ignition switch is turned to ON	A
   The skid control buzzer sounds continuously when the ignition switch is turned to ON	B

Result: 

B 

See step  8

Result: 

A 

See step  7

1. Remove the skid control buzzer.

   Refer to REMOVAL [08/2017 - ]

2. Inspect the skid control buzzer.

   Refer to INSPECTION [08/2017 - ]

   Result

   Result	Proceed to
   Skid control buzzer is abnormal	A
   Skid control buzzer is normal	B

Result: 

B 

See step  9

Result: 

A 

See step  8

1. Replace the skid control buzzer.

   Refer to REMOVAL [08/2017 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  9

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [08/2017 - 08/2019]

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

   Refer to DATA LIST / ACTIVE TEST [08/2017 - 08/2019]

   NOTE:

   Perform the Active Test for 1 second or more.

   HINT: 

   Performing the Active Test for 1 second or more causes DTC C1AA7 to be stored if the DTC detection conditions are met.

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   PCS Buzzer	Skid control buzzer	ON / OFF	Test possible with ignition switch ON, vehicle stopped

3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [08/2017 - 08/2019]

   Result

   Result	Proceed to
   DTC C1AA7 is not output	A
   DTC C1AA7 is output	B

Result: 

A 

END 

Result: 

B 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [08/2017 - ]