Toyota Tundra. Manual — part 598

b. Check that the accessory meter buzzer operates normally.

OK: Accessory meter buzzer operates normally.

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

OK: END (ACCESSORY METER IS DEFECTIVE)

CLEARANCE WARNING ECU POWER SOURCE CIRCUIT

DESCRIPTION

This circuit is the power source circuit to operate the clearance warning ECU.

WIRING DIAGRAM

Fig. 40: Clearance Warning ECU Power Source - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK FUSE (ECU-IG No. 1)

a. Remove the ECU-IG No. 1 fuse from the main body ECU.

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

Standard resistance

FUSE (ECU-IG No. 1) RESISTANCE SPECIFICATION

NG: REPLACE FUSE

Tester Connection Condition Specified Condition

ECU-IG No. 1 fuse Always

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Parking Assist/Monitoring - Tundra

OK: Go to next step

2. CHECK HARNESS AND CONNECTOR (MONITOR SWITCH - BATTERY)

a. Disconnect the L2 switch connector.

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

Standard voltage

HARNESS AND CONNECTOR (MONITOR SWITCH - BATTERY) VOLTAGE
SPECIFICATION

Fig. 41: Identifying L2 Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

3. INSPECT DRIVE MONITOR SWITCH

a. Remove the drive monitor switch (see REMOVAL ).

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

Standard resistance

DRIVE MONITOR SWITCH RESISTANCE SPECIFICATION

Tester Connection

Switch Condition Specified Condition

L2-7 (IG) - Body ground Ignition switch ON

11 to 14 V

Tester Connection

Switch Condition

Specified Condition

7 (IG) - 8 (SK)

Clearance sonar main switch ON

Below 1 ohms

Clearance sonar main switch OFF 10 kohms or higher

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Parking Assist/Monitoring - Tundra

Fig. 42: Identifying Drive Monitor Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE DRIVE MONITOR SWITCH (See REMOVAL )

OK: Go to next step

4. CHECK HARNESS AND CONNECTOR (ECU - MONITOR SWITCH AND BODY GROUND)

a. Disconnect the J35 ECU connector.

b. Disconnect the L2 switch connector.

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

Standard resistance

HARNESS AND CONNECTOR (ECU - MONITOR SWITCH AND BODY GROUND)
RESISTANCE SPECIFICATION

Tester Connection

Condition Specified Condition

J35-10 (IG) - L2-8 (SK)

Always

Below 1 ohms

J35-10 (IG) - Body ground Always

10 kohms or higher

J35-21 (E) - Body ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Parking Assist/Monitoring - Tundra

Fig. 43: Identifying J35 ECU And L2 Switch Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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

INDICATOR CIRCUIT

DESCRIPTION

The sonar ON/OFF indicator light and warning indicator lights are installed in the accessory meter.

WIRING DIAGRAM

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Parking Assist/Monitoring - Tundra