Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Clearance Warning Buzzer Circuit

DESCRIPTION

This circuit consists of the No. 1 clearance warning buzzer and clearance warning ECU assembly. An ECU-excited type buzzer is used. The battery voltage supplied through the buzzer is grounded inside the clearance warning ECU assembly using a pulsed digital pattern, producing sound. The ECU operates the buzzer using a sound pattern that changes depending on the distance to the obstacle.

WIRING DIAGRAM

PROCEDURE

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Intuitive P/A / Active Test.

(e) Check that the buzzer operates by performing the Active Test.

Intuitive P/A

Tester Display

Test Part

Control Range

Diagnostic Note

Buzzer

No. 1 clearance warning buzzer

Operate or Stop

Confirm that the vehicle is stopped and the ignition switch is ON

OK:

The No. 1 clearance warning buzzer sounds.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 1 CLEARANCE WARNING BUZZER)

(a) Disconnect the N31 connector from the No. 1 clearance warning buzzer.

(b) Disconnect the C30 connector from the clearance warning ECU assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C30-14 (BBZ) - N31-1

Always

Below 1 Ω

C30-13 (ER) - N31-2

C30-14 (BBZ) - Body ground

10 kΩ or higher

C30-13 (ER) - Body ground

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

REPLACE NO. 1 CLEARANCE WARNING BUZZER

(a) Replace the No. 1 clearance warning buzzer with a new or known good one (See page ).

NEXT

4.

PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Intuitive P/A / Active Test.

(e) Check that the buzzer operates by performing the Active Test.

Intuitive P/A

Tester Display

Test Part

Control Range

Diagnostic Note

Buzzer

No. 1 clearance warning buzzer

Operate or Stop

Confirm that the vehicle is stopped and the ignition switch is ON

OK:

The No. 1 clearance warning buzzer sounds.

OK

END (NO. 1 CLEARANCE WARNING BUZZER WAS DEFECTIVE)

NG

REPLACE CLEARANCE WARNING ECU ASSEMBLY

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