Toyota Avalon Service & Repair Manual: Engine Hood Courtesy Switch Circuit

DESCRIPTION

The engine hood courtesy switch is built into the hood lock assembly. This switch turns on when the engine hood is closed and turns off when the engine hood is opened.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

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PROCEDURE

1.

READ VALUE USING TECHSTREAM (HOOD COURTESY SW)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Hood Courtesy SW

Engine hood courtesy switch

OFF or ON

OFF: Engine hood closed

ON: Engine hood open

-

Body Electrical > Main Body > Data List

Tester Display

Hood Courtesy SW

OK:

The Techstream display changes correctly in response to the engine hood courtesy switch (hood lock assembly) status.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

2.

INSPECT ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY)

(a) Remove the hood lock assembly.

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(b) Inspect the engine hood courtesy switch (hood lock assembly).

Click here

NG

REPLACE ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY)

OK

3.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - ENGINE HOOD COURTESY SWITCH (HOOD LOCK ASSEMBLY) AND BODY GROUND)

(a) Disconnect the G33 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G33-30 (HCTY) - A12-2

Always

Below 1 Ω

G33-30 (HCTY) or A12-2 - Body ground

Always

10 kΩ or higher

A12-1 - Other terminals and body ground

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Diagnosis System

    Horn Circuit

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