Toyota Tundra Service Manual: Engine Hood Courtesy Switch Circuit

DESCRIPTION

The engine hood courtesy switch is installed together with the hood lock. This switch turns on when the engine hood is closed and turns off when the engine hood is opened.

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING TECHSTREAM (Hood Courtesy SW)

(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 / Main Body / Data List.

(e) According to the display on the Techstream, read the Data List.

Main Body

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Hood Courtesy SW

Engine hood courtesy switch/ON or OFF

ON: Engine hood open

OFF: Engine hood closed

-

OK:

The indicator on the Techstream switches between ON and OFF in accordance with the hood lock assembly (engine hood courtesy switch) status.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

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

(a) Disconnect the A29 hood lock assembly (engine hood courtesy switch) connector.

(b) Disconnect the J165 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A29-1 - J165-11 (HCTY)

Always

Below 1 Ω

A29-2 - Body ground

Always

Below 1 Ω

A29-1 or J165-11 (HCTY) - Other terminals and body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

INSPECT HOOD LOCK ASSEMBLY (ENGINE HOOD COURTESY SWITCH)

(a) Remove the hood lock assembly (engine hood courtesy switch).

Click here

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

Click here

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE HOOD LOCK ASSEMBLY (ENGINE HOOD COURTESY SWITCH)

    Data List / Active Test

    Glass Breakage Sensor ECU Circuit

    See More:

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