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

(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.

OK:

The No. 1 clearance warning buzzer sounds.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

(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:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

NEXT

(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.

OK:

The No. 1 clearance warning buzzer sounds.

OK

END (NO. 1 CLEARANCE WARNING BUZZER WAS DEFECTIVE)

NG

REPLACE CLEARANCE WARNING ECU ASSEMBLY