fault still exists. Use the Error Check Sheet to identify the source.

ECM
VDC
EPS
TCM
RDR
A/C
A/B
EYE
BIU
AHL
SRF
RES
AVN
IMB
KPS
IMP
MET

LAN01595

2-55
Error Check Sheet

BIU
The BIU on the 2015 Legacy and Outback has been redesigned to combine the interior fuse/relay
box and joint box.

2-56

2-57

Joint Box / BIU Front

Joint Box / BIU Rear

CAUTION: These components cannot be disassembled. Assembly replacement is required.
54

June 2014

2015 Legacy and Outback

New Technology Training

(Module 926)

NOTES:

55

June 2014

2015 Legacy and Outback
Power Rear Gate (PRG)

New Technology Training

(Module 926)

The 2015 Outback is optionally equipped with a Power Rear Gate (PRG). The PRG provides an
electric powered opening and closing feature that is controlled through a switch on the rear gate,
instrument panel, keyless access remote, or the mechanical keyless entry key.

3-2

3-1
Open PRG

Opener Switch

The Opener switch on the PRG is located between the rear license plate light lenses.

3-3

3-4

Closer Switch

Switch Cluster

The Closer switch is located on the left side of the gate, near the mechanical latch assembly.
The interior PRG Opener/Closer switch and PRG Memory Height switch are located on the switch
cluster to the left of the steering wheel.
Note:

The PRG of the 2015 Outback operates from a constant mesh gear drive system.
Do not use excessive force to manually operate the PRG or damage to the PRG
will occur.

56

June 2014

2015 Legacy and Outback

New Technology Training

(Module 926)

Warning: Keep away from the closing area of the rear gate (PRG). The outer edge of the rear
gate (PRG) beyond the touch sensor cannot detect solid objects and will not trigger a
safety maneuver until the amperage of the rear gate (PRG) exceeds a pre-established
specification.

The 2015 Outback PRG is classified as an Arm Lift system that receives mechanical power from
the motor through a set of stacked reduction and drive gears. A spring is used to assist with the
initial movement of the gate (opening or closing). Gate operation of the Forester Spindle Drive
PRG is accomplished with a threaded drive block and rotating threaded drive rod.

3-5

3-6

Arm Lift PRG

Spindle Drive PRG

The PRG of the Outback can never be separated from the reduction drive gears. This type of
system eliminates the need for a motor clutch and half stop solenoid. The combined gear ratio
and force from the gate struts will hold the gate in a set position.
The Forester PRG is equipped with an electric clutch to disengage the Spindle Drive system
from the reduction gears and motor. A Manual Release lever allowed for a fail-safe mechanical
disengagement of the moving parts that can be utilized if an electrical or mechanical problem
prevented the gate from opening.

3-7

3-8

PRG Gear Set

Manual Release Lever

Constant mesh Arm Lift PRGs cannot separate the gate lifting mechanism from the drive system
which prevents any type of fail-safe mechanical release. Removing the lift arm is the only way to
separate the gate from the PRG assembly.

57

June 2014

2015 Legacy and Outback

New Technology Training

(Module 926)

Construction
The PRG is driven by a DC brushed motor that delivers power to the PRG gear assembly. The
motor transfers mechanical power though a flexible metal drive shaft to a worm gear.

3-10

3-9
PRG Assembly

PRG Motor And Drive Shaft

The metal drive shaft is wire wound to increase strength. A spiral wound fiber thread surrounds
the drive shaft to ensure the clearance between engagement points is minimum.

3-12

3-11
Drive Shaft

Drive Shaft And Worm Gear

The drive shaft transfers power from the motor rotor to the worm gear set of the PRG gear assembly.
The final gear ratio provides the strength and speed needed to open and close the rear gate.

58

June 2014

2015 Legacy and Outback

New Technology Training

(Module 926)

All gears are lubricated during construction and require no additional maintenance.

3-13
Gears and Lubrication

Note:

Due to the constant mesh design of the gear set, Manual Mode is not
recommended. The opening force required to open the rear gate in Manual Mode
is 25 to 30 lbs., which is approximately double the force required to open the
Forester Spindle Drive PRG.

NOTES:

59

June 2014

2015 Legacy and Outback

New Technology Training

(Module 926)

Electrical Control
The PRG Control Unit is located next to the PRG motor assembly and is secured to the vehicle
body with 2 clips that are made onto the plastic body of the control unit. Use care when removing
the control unit so that the clips are not damaged. The PRG control unit communicates with the
BIU through a LIN communications wire for all PRG operations. Data to the Select Monitor will be
slow due to the reduced communications speed of the LIN circuit.
The operation of the Auto Closer assembly is the same as the Forester type
PRG. Refer to the 602 TRB for details on Auto Closer operation.

DATA LINK CONNECTOR

MB-44
F/B FUSE NO. 17
(B)

5

4

B40
6

FB-42
M/B FUSE NO. 19
(IG)

14

FB-58
F/B FUSE NO. 5
(IG)

8

FB-21
F/B FUSE NO. 14
(B)

16

Note:

L:

B : R423

K22

i81

POWER REAR GATE CM

PRG Control Unit

K2

L18
K : i171

A : R422

3-14

B4

A10

A12

B6

REF. TO ENGINE
ELECTRICAL SYSTEM

BODY INTEGRATED UNIT

3-15

LIN Circuit

The armature of the PRG motor is equipped with a revolution sensor reluctor which is constructed
with alternating magnetic poles. Two Hall sensors, Hall 1 and Hall 2, create input signals to the
PRG control unit as the alternating magnetic poles revolve by the sensors.

3-16

3-17

Revolution Sensor Reluctor

Hall Sensors

The PRG control unit combines the two signals to create the data viewed on the Subaru Select
Monitor as Rear Gate Speed and Pulse-count 2.

60

June 2014

2015 Legacy and Outback

New Technology Training

(Module 926)

3-18
Select Monitor Hall Sensor Data

3-19
Revolution Sensor Patterns

The speed and direction of the PRG motor is controlled by the power supply frequency and duty
ratio to the brushes and armature.

3-21

3-20
Brushes

PRG Motor Control

The frequency of the power supply can reach as high as 16,000 Hz. Typical motor amperage
is 18 amps during start up and 6 to 8 amps during normal movement. A blocked rear gate can
create current flow as high as 23 amps in the motor drive circuit, which will result in a reversal of
the rear gate direction.

3-22
Normal PRG Motor Amperage

61

June 2014

2015 Legacy and Outback

New Technology Training

(Module 926)

Touch Sensors
The pinch or Touch Sensor of the Outback PRG is comprised of four individual sensor strips that
are wired in series, providing only one input to the PRG control unit. Each side of the gate has
upper and lower sensor strips that are connected together under the upper edge trim of the lower
sensor. The lower sensor strips are bolted into place while the upper sensor strips are held in
place by an adhesive strip. Never re-use an upper sensor strip once it has been removed from
the vehicle.
Note:

If the rear window glass is removed, the upper sensor strips must be replaced.

(1)

T1

(2)

T1

3-23
Touch Sensors

3-24

Upper and Lower Touch Sensors

Always separate the upper and lower sensor strips during diagnostics to isolate an open or short
circuit of the individual sensors strips.
TOUCH SENSOR RH

TOUCH SENSOR LH

2
A9

1

A1

2

D150

1

D151

A: R422
POWER REAR GATE CM

3-26

3-25
Connector

Touch Sensor Artwork

A single DTC, B2524 Touch Sensor Failure, is provided to indicate a problem with the Touch Sensor.
Note:

The line drawing of the Touch Sensor in the PRG Diagnostics section of the
service manual does not include the detail needed to perform diagnostics.
Always refer to the PRG wiring schematics in the electrical section of the Subaru
Service Manual.
62

June 2014

2015 Legacy and Outback
b

A

New Technology Training

(Module 926)

R

POWER REAR
GATE CM

R89
A6

L

12

POWER REAR GATE
INNER SWITCH

D6
L

1

L

2

R

D154

D150
R

P

A1

V

7

V

V

D109

2

2

1

1

D151
P

D107

POWER REAR GATE
TOUCH SENSOR
(LWR) LH

D108

POWER REAR GATE
TOUCH SENSOR
(LWR) RH

D110

2

2

1

1

D111

POWER REAR GATE
TOUCH SENSOR
(UPR) LH

D112

POWER REAR GATE
TOUCH SENSOR
(UPR) RH

A: R422

3-27
Touch Sensor Wiring Schematic

NOTES:

63

June 2014

2015 Legacy and Outback

New Technology Training

8 7 6 5 4 3 2 1

3

2

1

16 15 14 13 12 11 10 9

6

5

4

4

3

2

(Module 926)

1

14 13 12 11 10 9 8 7 6 5

TO C: R424
TO A: R422

TO B: R423
SL-03073

3-28
PRG I/O Chart Connectors
Terminal No.

Description

Measuring condition

Standard