Toyota 4Runner: Engine Hood Courtesy Switch Circuit

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Theft Deterrent System / 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	-

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.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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

REPLACE SECURITY COURTESY SWITCH

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 ).

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

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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