Toyota Tundra. Manual — part 592

TERMINALS OF ECU

1. CHECK CLEARANCE WARNING ECU

Fig. 13: Identifying J35 ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Disconnect the J35 ECU connector.

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

J35 ECU CONNECTOR TERMINALS VOLTAGE AND RESISTANCE SPECIFICATION

mph) or more

Clearance warning ECU

TERMINALS OF ECU

Although system operates,
indicator does not illuminate

Indicator circuit

INDICATOR CIRCUIT

Clearance warning ECU

TERMINALS OF ECU

Indicator does not dim at night, or
illuminates dimly during daytime

Taillight circuit

TAILLIGHT RELAY

CIRCUIT

Clearance warning ECU

TERMINALS OF ECU

Although system operates,
clearance warning buzzer does not
sound

Clearance warning buzzer circuit

CLEARANCE WARNING

BUZZER CIRCUIT

Clearance warning ECU

TERMINALS OF ECU

Clearance warning buzzer volume
is low

Adjust volume

ADJUSTMENT

Rear corner and back sonar
operates when shift lever is not in
R, or does not operate even when
shift lever is in R

Park / Neutral position switch
circuit

PARK / NEUTRAL POSITION

SWITCH CIRCUIT

Clearance warning ECU

TERMINALS OF ECU

Terminal No.

(Symbols)

Wiring

Color

Terminal

Description

Condition

Specified

Condition

J35-1 (PL) -

J35-21 (E)

P - W-B

Parking position

signal

Ignition switch ON, shift lever
not in P position

Below 1.5 V

Ignition switch ON, shift lever in

P position

7 V or higher

J35-3 (SPD) -

J35-21 (E)

V - W-B Vehicle speed signal

Ignition switch ON, drive wheels
are turned slowly

Alternating
between 1.5 to

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Parking Assist/Monitoring - Tundra

4.5 V

J35-6 (SOR) -

J35-22 (E2)

LG-P

Rear sensor
communication
signal

Ignition switch ON, clearance
sonar main switch ON

Waveform 2

J35-7 (SOF)-

J35-23(E1)

GR-G

Front sensor
communication
signal

Ignition switch ON, clearance
sonar main switch ON

Waveform 2

J35-9 (BOF) -

J35-21 (E)

V - W-B

Ultrasonic sensor
power source

Ignition switch ON, clearance
sonar main switch ON

7.2 to 8.8 V

J35-10 (IG) -

J35-21 (E)

O - W-B

IG signal

Ignition switch ON, clearance
sonar main switch OFF

Below 1.5 V

IG power source

Ignition switch ON, clearance
sonar main switch ON

9 to 15 V

J35-11 (TL) -

J35-21 (E)

L - W-B

Illumination light

Ignition switch ON and light
control switch OFF

Below 1.5 V

Ignition switch and light control

switch ON

7 V or higher

J35-12 (BBZ)

- J35-21 (E)

Y - W-B

Clearance warning

buzzer

Clearance warning buzzer
sounding (when the back sonar
or clearance sonar senses
something)

Waveform 1

J35-13 (RL) -

J35-21 (E)

LG - W-B

Reverse position
signal

Ignition switch ON, shift lever
not in R position

Below 1.5 V

Ignition switch ON, shift lever in

R position

7 V or higher

J35-15 (L1) -

J35-21 (E)

G - W-B

Rear corner
ultrasonic sensor
RH

Clearance warning indicator
LED for rear corner sensor RH
illuminates

Below 3 V

J35-16 (L2) -

J35-21 (E)

V - W-B

Front corner
ultrasonic sensor
RH

Clearance warning indicator
LED for front corner sensor RH
illuminates

Below 3 V

J35-17 (L3) -

J35-21 (E)

GR - W-B

Rear corner
ultrasonic sensor
LH

Clearance warning indicator
LED for rear corner sensor LH
illuminates

Below 3 V

J35-18 (L4) -

J35-21 (E)

LG - W-B

Front corner
ultrasonic sensor
LH

Clearance warning indicator
LED for front corner sensor LH
illuminates

Below 3 V

J35-19 (L5) -

J35-21 (E)

O - W-B

Back ultrasonic
sensor LH and RH

Clearance warning indicator
LED for back sensor LH and RH
illuminates

Below 3 V

J35-20 (L6) -

J35-21 (E)

R - W-B

Clearance warning
ECU signal

Clearance warning indicator's
operation indicator illuminates

Below 3 V

J35-21 (E) -

Body ground

W-B -

Body

ground

ECU ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Parking Assist/Monitoring - Tundra

c. Using an oscilloscope, check waveform 1.

Waveform 1 (Reference)

OSCILLOSCOPE WAVEFORM 1 REFERENCE

Fig. 14: Identifying Waveform 1
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

d. Using an oscilloscope, check waveform 2.

Waveform 2 (Reference)

OSCILLOSCOPE WAVEFORM 2 REFERENCE

J35-22 (E2) -

J35-21 (E)

P - W-B

ECU ground

Always

Below 1 ohms

J35-23 (E1) -

J35-21 (E)

G - W-B

ECU ground

Always

Below 1 ohms

J35-24 (BOR)

- J35-21 (E)

Y - W-B

Ultrasonic sensor
power source

Ignition switch ON, clearance
sonar main switch ON

7.2 to 8.8 V

Item

Content

Terminal No. (Symbols) J35-12(BBZ)-J35-21 (E)

Tool Setting

2 V/DIV., 200 µsec./DIV.

Vehicle Condition

When sonar detects obstacle (buzzer sounds)

Item

Content

Terminal No. (Symbols)



CH: 1 J35-7 (SOF) - J35-23 (E1)



CH: 2 J35-6 (SOR) - J35-22 (E2)

Tool Setting

2 V/DIV., 200 µsec./DIV.

Condition

Ignition switch ON, clearance sonar main switch ON.

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Parking Assist/Monitoring - Tundra

Fig. 15: Identifying Waveform 2
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

ADJUSTMENT

1. ADJUST BUZZER VOLUME

a. Turn the knob on the clearance warning ECU to adjust the volume.

Fig. 16: Identifying Buzzer Volume Knob
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

PARK / NEUTRAL POSITION SWITCH CIRCUIT

DESCRIPTION

This circuit sends the park / neutral position switch signals to the clearance warning ECU.

WIRING DIAGRAM

2009 Toyota Tundra

2009 ACCESSORIES AND EQUIPMENT Parking Assist/Monitoring - Tundra