7-10

SRVD Settings

SRVD Warning Volume

NOTES:

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The SRVD system will not operate in the following situations:
1. The SRVD OFF indicator is illuminated
2. The vehicle speed is below 10 mph (15 km/h) even when the SRVD OFF indicator is
not illuminated (Except when reversing)
The following may cause the SRVD system indicators to illuminate:
1. Driving close to solid objects such as guardrails, tunnels, and sidewalls
2. Turning at an intersection in an urban area
3. A building or wall exists in the reversing direction
4. On a road with extremely narrow lanes, the system may detect vehicles driving in a
lane next to the neighboring lane

7-11
Driving to close to Guard Rail

The Radar sensors may not detect or may have difficulty detecting the following vehicles or objects
1.
2.
3.

4.
5.
6.
7.
8.

Small motorcycles, bicycles, pedestrians, and stationary objects on the road or road
side
Vehicles with body shapes that do not reflect radar (vehicles with low body height such
as a trailer with no cargo and sports cars)
Vehicles that are not approaching your vehicle even though they are in the detection
area either on a neighboring lane to the rear or beside your vehicle when reversing (The
system determines the presence of approaching vehicles based on the data detected
by the radar sensors)
Vehicles traveling at significantly different speeds
Vehicles driving in parallel at almost the same speed as your vehicle for a prolonged
period of time
Oncoming vehicles
Vehicles in a lane beyond the neighboring lane
Vehicles traveling at a significantly lower speed that you are trying to overtake

Caution: The driver is responsible for driving safely. Always be sure to check the surroundings
with your eyes when changing lanes or reversing the vehicle. This system is designed to
assist the driver by monitoring the rear and side areas of the vehicle during lane change
and reversing. However, you cannot rely on this system alone in assuring safety during a
lane change or reversing. Over-confidence in this system could result in an accident and
lead to serious injury or death. Since the system operation has various limitations, the
flashing or illumination of the SRVD approach indicator light may be delayed or it may
not operate at all even when a vehicle is present in a neighboring lane or approaching
from either side.
111

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Construction
The Subaru Rear Vehicle Detection system consists of two rear Radar units symmetrically fitted
behind the bumper cover under the rear tail lights.

7-12

7-13

Radar Units (Legacy)

Radar Units (Outback)

Bracket Legacy
Radar unit

Bracket Outback

7-14
Radar Unit Mounting

7-15
LH Radar Unit (Outback)

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New Technology Training

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The Subaru Rear Vehicle Detection system is classified as a Short Range Radar system. Each
of the two Radar units contains a Radio Frequency (RF) antenna that emits electromagnetic
radiation in the 24 GHz frequency range. At a distance of 20cm from the sensor, the radiated
power is 0.0027 mW/cm2. This is well below the human exposure protection limit of 1.0 mW/cm2.
The detectable angle from the center of each RF antenna is 75° or 150° total with a range of
approximately 230ft (70m). Regardless if the system is using BSD, LCA, and RCTA, the RF
antennas are always monitoring a 150° angle with a range of 230ft. What differentiates BSD,
LCA, and RCTA is the logic used to estimate relative speed difference versus distance of Time to
Collision (TTC) warning.

7-16
SRVD Detection Area

To ensure correct operation of the SRVD system, observe the following precautions:
1. Always keep the bumper surface near the radar sensor clean
2. Do not affix any stickers of other items on the bumper surface near the radar sensors
3. Do not modify the bumper near the radar sensors
4. Do not paint the bumper near the radar sensors
5. Do not expose the bumper near the radar sensors to strong impacts. If a sensor becomes
misaligned, a system malfunction may occur, including the inability to detect vehicles
entering the detection areas
Intersection

Intersection

Intersection
Vertical line

Vertical line

Vertical line
(100mm)

(150mm)

(100mm)

(100mm)

(80mm)

Vary from 100mm to
80mm along character line

7-17

7-18

Bumper Prohibited Areas Legacy

Bumper Prohibited Areas Outback

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Each Radar unit contains an internal control unit that processes information from the RF antenna
and controls alert decisions. The left and right rear Radar units are distinguished as Master (LH)
and Slave (RH). The Master and Slave Radar units are connected to each other via a private
CAN network where alert decisions are determined. The Master (LH) Radar unit communicates
with the Main CAN for necessary vehicle information and receives a direct input from the console
mounted SRVD “OFF” switch. Each Radar unit has direct control over its respective side mirror
LED indicator.

(A)

F/B

(2)

5 ING

8 ON-OFF SW

5 ING

4 Door Mirror LED

(3)

(4)

(5)

4 Door Mirror LED

(1)

(6)
2 Main CAN +
7 Main CAN 1 Private CAN +

10 ECU Ground

10 ECU Ground

6 Private CAN -

7-19
SRVD System Overview

7-20

7-21

SRVD LH (Master) Data

SRVD RH (Slave) Data

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5

4

3

2

1

10

9

8

7

6

(Module 926)

7-22
Radar Unit Connector
Terminal No.
1 ←→
2 ←→
3 ←→
4 ←→
5 ←→

Radar LH (master)

Contents
Radar RH (slave)

Measuring condition

Standard

Chassis ground

Private CAN H

Private CAN H

Always

1 MΩ or more

Chassis ground

Master CAN H

—

Always

1 MΩ or more

Chassis ground

—

—

—

—

Chassis ground

Left mirror LED output

Right mirror LED output

When Ignition key Inserted

Pulse generation

Chassis ground

Ignition power supply

Ignition power supply

Ignition switch OFF → ON

Less than 1 V

1 MΩ or more
1 MΩ or more
Less than 1 V → 9
— 16 V

6 ←→ Chassis ground

Private CAN L

Private CAN L

Always

7 ←→ Chassis ground
8 ←→ Chassis ground

Master CAN L
Subaru Rear Vehicle
Detection OFF switch

—
—

9 ←→ Chassis ground
10 ←→ Chassis ground

—
GND

—
GND

Always
• Ignition switch ON
• Subaru Rear Vehicle
Detection switch OFF →
ON
—
Always

→9

—
Less than 1 Ω

SRVD “OFF” Switch
A console mounted SRVD “OFF” switch functions to disable the SRVD system.
In the following cases, press the SRVD “OFF” switch to deactivate the system:
1. When towing a trailer.
2. When a bicycle carrier or other item is fitted to the rear of the vehicle.

SRVD Off

7-23
SRVD OFF Switch Placement

7-25

7-24
SRVD OFF Switch

115

SRVD OFF Indicator

June 2014

2015 Legacy and Outback

New Technology Training

(Module 926)

Diagnostics
The “SRVD Disabled” message is displayed when the system is used at extremely high or low
temperatures or when abnormal voltage exists. Once these conditions are corrected, the system
will recover from the temporary stop condition and the indicator will turn off.

SRVD Disabled

7-26
SRVD Disabled Indicator

The “SRVD Disabled Sensor Blocked” message is displayed when the detectability of the radar
sensor is reduced. Once the condition is corrected, the system will recover from the temporary
stop condition and the indicator will turn off.

SRVD Disabled
Sensor Blocked
7-27
SRVD Sensor Blocked Indicator

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DTC

SSM Indication

New Technology Training

Detection Condition

(Module 926)

Resetting Condition

B2300

RADAR ASSY B&&S LED short
circuit to earth

This failure occurs if the harness
from the rear side radar through
the door mirror to ground shortcircuits to ground.

B2301

RADAR ASSY B&&S LED open
circuit or short circuit to power
supply

This failure occurs if the harness
from the rear side radar through
the door mirror to ground
disconnects or causes a shortcircuit in the power supply system.

When the ignition is set to ON, the harness
should operate normally.

B2304

RADAR ASSY B&&S ON-OFF
switch adhesion

This failure occurs if the harness
from the rear side radar through
the door mirror to ground shortcircuits to ground.

When the ignition is set to ON, the switch
should operate normally.

U0073

Control Module Communication
Bus “A” Off

U0074

Control Module Communication
Bus “B” OFF

U0422

Invalid Data Received From Body
Control Module

U0402

Invalid Data Received From TCM

U0401

Invalid Data Received From ECM/
PCM “A”

U0423

Invalid Data Received From
Instrument Panel Cluster Control
Module

U0416

Invalid Data Received From
Vehicle Dynamics Control Module

Conforms to “CAN Communication
Control Specification” issued by
DGSD2.

The triggered indication is reset by
normalizing the CAN.

U0140

Lost Communication With Body
Control Module

U0101

Lost Communication With TCM

U0100

Lost Communication With ECM/
PCM “A”

U0155

Lost Communication With
Instrument Panel Cluster (IPC)
Control Module

U0122

Lost Communication With Vehicle
Dynamics Control Module

B2311

RADAR ASSY B&&S TCM fail
detection

This failure occurs if the system
breaks down due to a failed rear
side radar caused by a failure in
the TCM.

When the ignition is set to ON, the TCM
should operate normally.

B2313

RADAR ASSY B&&S VDC fail
detection

This failure occurs if the system
breaks down due to a failed rear
side radar caused by a failure in
the VDC.

When the ignition is set to ON, the VDC
should operate normally.

B2320

RADAR ASSY B&&S Low Voltage
(less than 9V)

This failure occurs if the voltage
applied to the rear side radar stays
at 9 V or lower for about 5 sec.

When the power supply becomes higher
than 9 V, the triggered indication is reset.