Toyota Tundra Service Manual: Skid Control Buzzer Circuit (C1AA7)

DESCRIPTION

The forward recognition camera operates the pre-collision warning by sending a buzzer request signal to the skid control buzzer assembly.

If the forward recognition camera detects a malfunction in the skid control buzzer assembly circuit, it will output DTC C1AA7.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1AA7

Skid Control Buzzer Circuit

When the ignition switch is turned to ON and the pre-collision warning is operating, and one of the following conditions is met (1 trip detection logic*):

  • A buzzer request signal is sent to the skid control buzzer assembly but the buzzer does not sound for 1 second or more.
  • A buzzer request signal is not sent to the skid control buzzer assembly but the buzzer sounds for 1 second or more.
  • There is no buzzer sounding request and an open circuit is detected in the skid control buzzer assembly for 1 second or more.
  • Skid control buzzer assembly
  • Forward recognition camera
  • Harness or connector
  • *: Only output while a malfunction is present.
DTC Detection Conditions
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnosis Condition

When the ignition switch is turned to ON and the pre-collision warning is operating

Malfunction Status

A buzzer request signal is sent to the skid control buzzer assembly but the buzzer does not sound

-

-

A buzzer request signal is not sent to the skid control buzzer assembly but the buzzer sounds

-

-

There is no buzzer sounding request and an open circuit is detected in the skid control buzzer assembly

-

-

Detection Time

1 second or more

1 second or more

1 second or more

Number of Trips

1 trip

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one, be sure to perform Forward Recognition Camera Axis Adjustment.

    Click here

PROCEDURE

1.

CHECK FOR DTCs (FORWARD RECOGNITION CAMERA SYSTEM)

(a) Clear the DTCs.

Click here

(b) Perform the Active Test according to the display on the Techstream.

Click here

NOTICE:

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 assembly

ON / OFF

Test possible with ignition switch ON, vehicle stopped

(c) Check for DTCs.

Click here

Result

Proceed to

DTC C1AA7 is not output

A

DTC C1AA7 is output

B

A

USE SIMULATION METHOD TO CHECK

B

2.

CHECK TERMINAL VOLTAGE

(a) Disconnect the skid control buzzer assembly connector.

*a

Front view of wire harness connector

(to Skid Control Buzzer Assembly)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

J167-2 (IG1) - Body ground

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

(c) Connect the skid control buzzer assembly connector.

NG

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

OK

3.

CHECK HARNESS AND CONNECTOR (SKID CONTROL BUZZER ASSEMBLY - FORWARD RECOGNITION CAMERA)

(a) Disconnect the J167 skid control buzzer assembly connector.

(b) Disconnect the W9 forward recognition camera connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J167-1 (BZ) - W9-8 (BZ)

Always

Below 1 Ω

J167-1 (BZ) or W9-8 (BZ) - Body ground

Always

10 kΩ or higher

(d) Connect the W9 forward recognition camera connector.

(e) Connect the J167 skid control buzzer assembly connector.

OK

GO TO STEP 6

NG

4.

REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL BUZZER ASSEMBLY - FORWARD RECOGNITION CAMERA)

(a) Repair or replace the harness or connector.

NEXT

5.

CHECK FOR DTCs (FORWARD RECOGNITION CAMERA SYSTEM)

(a) Clear the DTCs.

Click here

(b) Perform the Active Test according to the display on the Techstream.

Click here

NOTICE:

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 assembly

ON / OFF

Test possible with ignition switch ON, vehicle stopped

(c) Check for DTCs.

Click here

Result

Proceed to

DTC C1AA7 is not output

A

DTC C1AA7 is output

B

A

END

B

6.

INSPECT SKID CONTROL BUZZER ASSEMBLY (CONFIRM BUZZER OPERATION)

(a) Turn the ignition switch to ON.

(b) Check if the skid control buzzer assembly is sounding.

Result

Proceed to

The skid control buzzer assembly does not sound when the ignition switch is turned to ON

A

The skid control buzzer assembly sounds continuously when the ignition switch is turned to ON

B

B

GO TO STEP 8

A

7.

INSPECT SKID CONTROL BUZZER ASSEMBLY (UNIT INSPECTION)

(a) Remove the skid control buzzer assembly.

Click here

(b) Inspect the skid control buzzer assembly.

Click here

Result

Proceed to

Skid control buzzer assembly is abnormal

A

Skid control buzzer assembly is normal

B

B

GO TO STEP 9

A

8.

REPLACE SKID CONTROL BUZZER ASSEMBLY

(a) Replace the skid control buzzer assembly.

Click here

NEXT

9.

CHECK FOR DTCs (FORWARD RECOGNITION CAMERA SYSTEM)

(a) Clear the DTCs.

Click here

(b) Perform the Active Test according to the display on the Techstream.

Click here

NOTICE:

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 assembly

ON / OFF

Test possible with ignition switch ON, vehicle stopped

(c) Check for DTCs.

Click here

Result

Proceed to

DTC C1AA7 is not output

A

DTC C1AA7 is output

B

A

END

B

REPLACE FORWARD RECOGNITION CAMERA

    Yaw Rate Sensor Circuit (C1AA4,C1AA5)

    Front Camera Module Incorrect Axial Gap (C1AA8,C1AA9)

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