Toyota Tundra. Manual — part 381

If the result is not as specified, replace the HORN fuse.

b. Measure the resistance of the horn relay circuit.

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

Standard resistance

RESISTANCE REFERENCE

If the result is not as specified, replace the integration relay.

4. INSTALL INTEGRATION RELAY (UNIT E)

a. Connect the 3 connectors.

b. Install the integration relay to the engine room relay block.

Fig. 5: Identifying Integration Relay Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c. Install the engine room relay block cover.

5. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL

Tester

Connection

Condition

Specified

Condition

1A-8 - 1C-1

When battery voltage is not applied between 1A-7
and 1C-1

10 kohms or higher

When battery voltage is applied between 1A-7 and
1C-1

Below 1 ohms

NOTE:

Some systems need to be initialized after the cable is reconnected (see
INITIALIZATION ).

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Horn - Tundra

LOW PITCHED HORN

COMPONENTS

Fig. 6: Identifying Low Pitched Horn Components
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

REMOVAL

1. REMOVE LOW PITCHED HORN ASSEMBLY

a. Disconnect the horn connector.

b. Remove the bolt and horn.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Horn - Tundra

Fig. 7: Identifying Horn And Bolt
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION

1. INSPECT LOW PITCHED HORN ASSEMBLY

a. Apply battery voltage and check operation of the horn, as shown in the table.

Fig. 8: Applying Battery Voltage And Checking Operation Of Low Pitched Horn
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK

VOLTAGE SPECIFICATIONS

If the result is not as specified, replace the horn.

INSTALLATION

1. INSTALL LOW PITCHED HORN ASSEMBLY

a. Install the horn with the bolt.

Measurement Condition

Specified Condition

Battery positive (+) --> Terminal 1

Battery negative (-) --> Body ground

Horn sounds

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Horn - Tundra

Fig. 9: Identifying Horn And Bolt
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf)

b. Connect the horn connector.

HIGH PITCHED HORN

COMPONENTS

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Horn - Tundra