Toyota Tundra. Manual — part 594

a. Disconnect the J35 ECU connector.

b. Disconnect the J28 meter connector.

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

Standard resistance

HARNESS AND CONNECTOR (ECU - METER) RESISTANCE SPECIFICATION

Fig. 22: Identifying J35 ECU And J28 Meter Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go TO METER / GAUGE SYSTEM (See HOW TO PROCEED WITH
TROUBLESHOOTING )

TAILLIGHT RELAY CIRCUIT

WIRING DIAGRAM

Tester Connection

Condition Specified Condition

J35-3 (SPD) - J28-35 (+S)

Always

Below 1 ohms

J35-3 (SPD) - Body ground Always

10 kohms or higher

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Parking Assist/Monitoring - Tundra

Fig. 23: Taillight Relay - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK TAILLIGHT

a. Turn the light control switch to the TAIL position.

b. Check that the taillight turns on.

OK: Taillight turns on.

NG: Go TO LIGHTING SYSTEM (See HOW TO PROCEED WITH TROUBLESHOOTING )

OK: Go to next step

2. CHECK HARNESS AND CONNECTOR (ECU - BATTERY)

a. Disconnect the J35 ECU connector.

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

Standard voltage

HARNESS AND CONNECTOR (ECU - BATTERY) VOLTAGE SPECIFICATION

Tester Connection

Switch Condition

Specified

Condition

J35-11 (TL) - Body
ground

Ignition switch ON, light control switch TAIL

7 V or higher

Ignition switch ON, light control switch except
TAIL

Below 1.5 V

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Parking Assist/Monitoring - Tundra

Fig. 24: Identifying TL Terminal Of J35 ECU Connector
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

BACK SONAR SENSOR LH CIRCUIT

DESCRIPTION

The ultrasonic sensor sends and receives ultrasonic waves. Based on the received wave, the sensor calculates
the approximate distance value between the vehicle and the obstacle, and sends the distance value as a signal to
the clearance warning ECU.

WIRING DIAGRAM

Fig. 25: Back Sonar Sensor LH - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. REPLACE BACK NO. 2 ULTRASONIC SENSOR LH

a. Replace the ultrasonic sensor with a normally functioning sensor (see REMOVAL ).

2. CHECK HARNESS AND CONNECTOR (BACK SENSOR LH - BACK SENSOR RH)

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Parking Assist/Monitoring - Tundra

a. Disconnect the S4 and S3 sensor connectors.

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

Standard resistance

HARNESS AND CONNECTOR (BACK SENSOR LH - BACK SENSOR RH) RESISTANCE
SPECIFICATION

Fig. 26: Identifying S4 And S3 Sensor Connectors 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

BACK SONAR SENSOR RH CIRCUIT

Tester Condition

Condition Specified Condition

S4-1 (BI) - S3-2 (BO)

Always

Below 1 ohms

S4-3 (SI) - S3-4 (SO)

Always

Below 1 ohms

S4-5 (EI) - S3-6 (EO)

Always

Below 1 ohms

S4-1 (BI) - Body ground Always

10 kohms or higher

S4-3 (SI) - Body ground Always

10 kohms or higher

S4-5 (EI) - Body ground Always

10 kohms or higher

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Parking Assist/Monitoring - Tundra