Toyota FJ Cruiser (GSJ 10, 15 series). Manual - part 349

PM–20

PARK ASSIST / MONITORING  –  CLEARANCE SONAR SYSTEM

PM

DESCRIPTION

Turning this switch on activates the clearance sonar system.

WIRING DIAGRAM

INSPECTION PROCEDURE

(a) Remove the back sonar switch.
(b) Check the resistance.

Standard resistance

(c) Reinstall the back sonar switch.

NG

OK

Clearance Sonar Main Switch Circuit

1

INSPECT BACK SONAR SWITCH ASSEMBLY

Clearance Warning ECU 

Assembly

+B

E

ECU

E

IG

AM1

AM1

IG1

IG1

Back Sonar Switch 

Assembly

Ignition Switch

ALT

Battery

B132696E02

6

6 5 4 3 2 1

ECU

E

IG

Back Sonar Switch:

I102377E02

Tester Connection

Switch Condition

Specified Condition

3 (IG) - 4 (ECU)

Back sonar switch ON

Below 1 

Ω

Back sonar switch OFF

1 M

Ω or higher

3 (IG) - 6 (E)

Back sonar switch ON

Below 30 

Ω

Back sonar switch OFF

10 k

Ω or higher

REPLACE BACK SONAR SWITCH 
ASSEMBLY

PARK ASSIST / MONITORING  –  CLEARANCE SONAR SYSTEM

PM–21

PM

(a) Disconnect the E12 back sonar switch connector.
(b) Disconnect the E31 clearance warning ECU connector.
(c) Measure the voltage of the wire harness side connector.

Standard voltage

(d) Check the resistance.

Standard resistance

(e) Reconnect the switch connector.
(f)

Reconnect the ECU connector.

NG

OK

(a) Disconnect the E31 clearance warning ECU connector.
(b) Measure the voltage of the wire harness side connector.

Standard voltage

(c) Reconnect the ECU connector.

OK

NG

2

CHECK HARNESS AND CONNECTOR (SWITCH - ECU, BATTERY AND BODY GROUND)

1 2

3

4 5

6

7 8

9 10 11 12

1 2 3 4 5 6

Clearance Warning ECU

E31

Wire Harness Side:

Back Sonar Switch

E12

ECU

IG

+B

E

Front View

Front View

E

I102378E02

Tester Connection

Switch Condition

Specified Condition

E12-3 (IG) - Body 

ground

Ignition switch ON

11 to 14 V

Tester Connection

Specified Condition

E12-4 (ECU) - E31-3 (+B)

Below 1 

Ω

E12-6 (E) - Body ground

E31-10 (E) - Body ground

REPAIR OR REPLACE HARNESS OR 
CONNECTOR

3

CHECK CLEARANCE WARNING ECU ASSEMBLY

Wire Harness Side:

E31

E

+B

Front View

F100692E09

Tester Connection

Switch Condition

Specified Condition

E31-3 (+B) - E31-10 (E)

Ignition switch ON, 

back sonar switch ON

11 to 14 V

REPLACE CLEARANCE WARNING ECU 
ASSEMBLY

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

PM–22

PARK ASSIST / MONITORING  –  CLEARANCE SONAR SYSTEM

PM

DESCRIPTION

The clearance warning ECU receives the ultrasonic sensor signal to sound the clearance warning buzzer.

WIRING DIAGRAM

INSPECTION PROCEDURE

(a) Disconnect the E10 clearance warning buzzer 

connector.

(b) Disconnect the E31 clearance warning ECU connector.
(c) Measure the voltage of the wire harness side connector.

Standard voltage

(d) Check the resistance.

Standard resistance

(e) Reconnect the buzzer connector.
(f)

Reconnect the ECU connector.

NG

Clearance Warning Buzzer Circuit

1

CHECK HARNESS AND CONNECTOR (BUZZER - ECU AND BATTERY)

Clearance Warning ECU

BBZ

Clearance Warning Buzzer

IG1

From

Ignition Switch

B132695E02

1 2

3

4 5

6

7 8

9 10 11 12

1

2

Wire Harness Side:

Clearance Warning ECU

Clearance Warning Buzzer

E31

E10

BBZ

I102380E02

Tester Connection

Switch Condition

Specified Condition

E10-1 - Body ground

Ignition switch ON

11 to 14 V

Tester Connection

Specified Condition

E10-2 - E31-2 (BBZ)

Below 1 

Ω

REPAIR OR REPLACE HARNESS OR 
CONNECTOR

PARK ASSIST / MONITORING  –  CLEARANCE SONAR SYSTEM

PM–23

PM

OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE