Toyota 4Runner manuals

Toyota 4Runner: Engine Hood Courtesy Switch Circuit

DESCRIPTION

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

WIRING DIAGRAM


PROCEDURE

1.

READ VALUE USING TECHSTREAM (SECURITY COURTESY SWITCH)

(a) Using the Techstream, read the Data List (See page ).


Main Body

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Hood Courtesy SW

Security courtesy switch /

ON or OFF

ON: Engine hood open

OFF: Engine hood closed

-

OK:

ON (engine hood open) and OFF (engine hood closed) appear on screen according to condition of engine hood.


OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


NG

2.

INSPECT SECURITY COURTESY SWITCH

(a) Disconnect the A19 switch connector.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (GRD) - 2 (CTYH)

Unlock position

Below 1 Ω

1 (GRD) - 2 (CTYH)

Lock position

10 kΩ or higher


NG

REPLACE SECURITY COURTESY SWITCH


OK

3.

CHECK HARNESS AND CONNECTOR (SECURITY COURTESY SWITCH - MAIN BODY ECU AND BODY GROUND)

(a) Disconnect the A19 switch connector.

(b) Remove the main body ECU (See page ).


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A19-2 (CTYH) - A-20 (HCTY)

Always

Below 1 Ω

A19-1 (GRD) - Body ground

Always

Below 1 Ω

A19-2 (CTYH) or A-20 (HCTY) - Body ground

Always

10 kΩ or higher


OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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