Toyota Tundra. Manual — part 702

Techstream

Main body

TECHSTREAM MAIN BODY REFERENCE CHART

Immobilizer

TECHSTREAM IMMOBILIZER REFERENCE CHART

ENGINE HOOD COURTESY SWITCH CIRCUIT

DESCRIPTION

The engine hood 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

Fig. 6: Engine Hood Courtesy Switch - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. READ VALUE OF TECHSTREAM (ENGINE HOOD COURTESY SWITCH)

a. Using Techstream, read the Data List.

Tester Display

Test Part

Control Range Diagnostic Note

Security Horn

Security horn

ON or OFF

-

Security Indicator Security indicator

ON or OFF

-

Tester Display

Test Part

Control Range Diagnostic Note

Security Indicator Security indicator

ON or OFF

-

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Theft Deterrent - Tundra

Techstream

Main Body

TECHSTREAM MAIN BODY REFERENCE CHART

OK: ON (engine hood is open) appears on screen.

NG: Go to step 2

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE

2. INSPECT HOOD LOCK ASSEMBLY (ENGINE HOOD COURTESY SWITCH)

Fig. 7: Identifying Hood Lock Assembly Lock And Unlock Position
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Remove the hood lock (see REMOVAL ).

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

Standard resistance

HOOD LOCK ASSEMBLY (ENGINE HOOD COURTESY SWITCH)

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic

Note

Hood Courtesy

Switch

Engine hood courtesy switch /
ON or OFF

ON: Engine hood is
open
OFF: Engine hood is
closed

-

Tester Connection

Condition

Specified Condition

1-2

UNLOCK position

Below 1 ohms

LOCK position

10 kohms or higher

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Theft Deterrent - Tundra

NG: REPLACE HOOD LOCK ASSEMBLY (ENGINE HOOD COURTESY SWITCH) (See
REMOVAL )

OK: Go to Next Step

3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ENGINE HOOD COURTESY

SWITCH AND BODY GROUND)

a. Disconnect the J4 main body ECU connector.

b. Disconnect the A29 engine hood courtesy switch connector.

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

Standard resistance

MAIN BODY ECU - ENGINE HOOD COURTESY SWITCH AND BODY GROUND

Fig. 8: Checking Harness And Connector (Main Body ECU - Engine Hood Courtesy Switch

Tester Connection

Condition Specified Condition

J4-16 (HCTY) - A29 - 1

Always

Below 1 ohms

A29-2 - Body ground

J4-16 (HCTY) or A29 - 1 - Body ground Always

10 kohms or higher

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Theft Deterrent - Tundra

And Body Ground)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MAIN BODY ECU

HORN CIRCUIT

DESCRIPTION

When the theft deterrent system changes from the armed state to the alarm sounding state, the main body ECU
transmits a signal to cause the horns to sound at 0.4 second intervals.

WIRING DIAGRAM

Fig. 9: Horn - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK HORN ASSEMBLY

a. Press the horn switch and check if the vehicle horns sound normally.

OK: Vehicle horns sound normally.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Theft Deterrent - Tundra