Infiniti QX56 (JA60). Manual - part 871

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REAR SONAR SYSTEM

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1. Push and hold sonar system OFF switch for three seconds to

reset time-out counter.

2. Push and hold sonar system OFF switch for three seconds to

clear codes. 

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< FUNCTION DIAGNOSIS >

FRONT AND REAR SONAR SYSTEM

FRONT AND REAR SONAR SYSTEM

System Diagram

INFOID:0000000005146189

System Description

INFOID:0000000005146190

FUNCTION

With power and ground supplied, transmission gear selector lever in R position, and the sonar system OFF

switch ON, the sonar system will detect obstacles within 1.8 m (5.9 ft.) of the rear sonar sensors and the two

outer front sonar sensors. The vehicle operator is notified of obstacles by varied rate of tone from the rear

sonar buzzer depending on distance of obstacle being sensed.  If the vehicle speed reaches 50 km/h (31

MPH) the sonar system will shut down.

With power and ground supplied, transmission gear selector lever in a forward drive gear, and the sonar sys-

tem OFF switch ON, the front sonar system will detect obstacles within 1.0 m (3 ft.) of the front sonar sensors.

The vehicle operator is notified of obstacles by varied rate of tone from the front sonar buzzer depending on

distance of obstacle being sensed.  When the vehicle accelerates to 12 km/h (7.5 MPH) the sonar system will

shut down.  When the vehicle decelerates to 8 km/h (5 MPH) the sonar system will turn back on.

SONAR SYSTEM OFF SWITCH

With power and ground supplied to the sonar control unit, transmission gear selector lever in a position other

than P, the sonar system can be disabled and the sonar buzzers silenced by momentarily pressing the sonar

system OFF switch. The sonar system OFF indicator lamp will be illuminated in the sonar system OFF switch.

The sonar system and buzzers will be disabled and the sonar system OFF indicator will be illuminated until the

ignition switch is turned OFF.  When the ignition switch is turned ON, the sonar system will be enabled.

Depressing the sonar system OFF switch again will enable the sonar system also. Enabling the sonar system

will cause the sonar system OFF indicator to go out.  The indicator will flash if a malfunction exists in the sys-

tem.

SONAR BUZZERS

With power and ground supplied to the sonar control unit and the A/T selector lever in R position, a stationary

object that is at least 9.0 cm (3.5 in.) wide and that is closer than 1.8 m (5.9 ft.) will be detected by the rear

sonar sensors and the two outer front sonar sensors, causing the rear sonar buzzer to sound a tone. As the

vehicle moves closer to the object, the rate of the tone will increase. When the object is less than 25.0 cm (10

in.) from the rear bumper, the tone will sound continuously.

With power and ground supplied to the sonar control unit and the A/T selector lever in a forward drive gear, a

stationary object that is at least 9.0 cm (3.5 in.) wide and that is closer than 1.0 m (3 ft.) will be detected by the

front sonar sensors, causing the front sonar buzzer to sound a tone. As the vehicle moves closer to the object,

the rate of the tone will increase. When the object is less than 30 cm (12 in.) from the front bumper, the tone

will sound continuously.

REAR SONAR SENSORS

With power and ground supplied to the rear sonar sensors, the sonar sensors transmit an ultrasonic signal.

This signal is reflected back to the sensor by objects large enough and close enough to be detected. The rear

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FRONT AND REAR SONAR SYSTEM

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sonar sensors measure the time from the transmitted signal to the time the signal is reflected back and send

this information to the sonar control unit.

FRONT SONAR SENSORS

With power and ground supplied to the front sonar sensors, the sonar sensors transmit an ultrasonic signal.

This signal is reflected back to the sensor by objects large enough and close enough to be detected. The front

sonar sensors measure the time from the transmitted signal to the time the signal is reflected back and send

this information to the sonar control unit.

COMBINATION METER

The combination meter provides the vehicle speed and park signals to the sonar control unit.

Component Parts Location

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Front

1.

Sonar control unit B56, B57
(View with luggage side finisher LH removed)

2.

Back-up lamp relay M73

3.

A/T assembly F9

4.

Front sonar buzzer M118

5.

Sonar system OFF switch M116
(with sonar system OFF indicator)

6.

Rear sonar sensor LH outer C102

7.

Rear sonar sensor LH inner C103

8.

Rear sonar sensor RH inner C104 9.

Rear sonar sensor RH outer C105

10. Front sonar sensor RH outer E166

11. Front sonar sensor RH inner E163 12. Front sonar sensor LH inner E162

13. Front sonar sensor LH outer E158

14. Combination meter M23, M24

15. Rear sonar buzzer B166

(View with back door open)

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FRONT AND REAR SONAR SYSTEM

Component Description

INFOID:0000000005146192

CONSULT-III Function (SONAR)

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SELF DIAGNOSTIC PROCEDURE

CONSULT-III can be used to read and clear DTCs.  Refer to 

GI-46, "Description"

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SELF DIAGNOSTIC RESULTS

Refer to 

SN-44, "DTC Index"

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Component

Function

Sonar control unit

Controls sonar system and provides self-diagnosis

Back-up lamp relay

Provides reverse signal for sonar control unit

A/T assembly

Controls back-up lamp relay

Front sonar buzzer

Sounds a signal when objects are detected in the front of the vehicle

Rear sonar buzzer

Sounds a signal when objects are detected in the rear of the vehicle

Sonar system OFF switch

Enables the driver to turn the system off and signals a system malfunction

Front sonar sensors

Senses objects in the front of the vehicle

Rear sonar sensors

Senses objects in the rear of the vehicle

Combination meter

Provides Park and vehicle speed signals for sonar control unit

Diagnosis mode

Description

SELF-DIAG RESULTS

Displays sonar control unit self-diagnosis results.