NAV-TV MOST-H.U.R. 31 Installation Manual

MOST-H.U.R. 31

Head Unit Replacement interface for select ‘10-’16 Porsche CDR31 or PCM3.1 radio

NTV-KIT835

BHM

08/08/17

NTV-DOC300

3950 NW 120

th

Ave, Coral Springs, FL 33065 TEL [phone] FAX [phone]

BHM

08/08/17

NTV-DOC300

Agreement: End user agrees to use this product in compliance with all State and Federal laws. NAV-TV Corp. would not be held liable for misuse of its product.
If you do not agree, please discontinue use immediately and return product to place of purchase. This product is intended for off-road use and passenger
entertainment only.

2 | P a g e

Fiber Optic extension

cable/connector

NTV-HAR067/NTV-CON002

USB Cable (updates)

NTV-CAB009

Wire side view

Antenna Adapter

NTV-CAB027

Overview

The MOST-HUR31 is a radio replacement interface for select Porsche vehicles equipped with PCM3.1 or CDR31
radio & external BOSE M.O.S.T. fiber optic amplifier. The module allows the factory amplifier, speakers and
sound quality to be retained when adding a modern aftermarket radio. Other components in the factory
system, such as a CD changer, satellite radio, telephone module, DVD player, or any other factory component
in the M.O.S.T loop will not need to removed, but will not function after the installation.

Kit Content

MOST-HUR31 Pinout

Pin #

Description

Color

Radio Connections:

1

Constant 12v (+)

Yellow

Radio, Constant Power

2

Left Front Audio IN

White RCA

Radio, Left Front RCA OUT

3

Rear Common Shield

Green/Purple RCA

Radio, Rear RCA Common

4

Left Rear Audio IN

Green RCA

Radio, Left Rear OUT

5

Remote IN

Yellow/Black

Radio, Remote OUT

6

--NOT USED--

Yellow/Blue

--

7

Reverse Signal OUT

Purple/White

Radio, Reverse IN

8

Illumination OUT

Orange

Radio, Illumination Control

9

CAN HI

Brown/Red

--

10

Ground

Black

Radio, Black (Ground)

11

Right Front Audio IN

Gray RCA

Radio, Right Front RCA

12

Front Common Shield

White/Gray RCA

Radio, Front RCA Common

13

Right Rear Audio IN

Purple RCA

Radio, Right Rear OUT

14

IR OUT

White

Radio, IR Control

15

Parking Brake OUT

Green

Radio, Parking Brake IN

16

--NOT USED--

Green/White

--

17

12 ACC OUT (1 amp)

Red

Radio, ACC Power

18

CAN LO

Brown

--

MOST-HUR31 interface

NTV-ASY265

Plug & Play T-Harness

NTV-HAR285

3.5mm plug for IR

NTV-CAB026

Wires highlighted green will

be connected to the vehicle

via the Plug & Play Harness.

BHM

08/08/17

NTV-DOC300

Agreement: End user agrees to use this product in compliance with all State and Federal laws. NAV-TV Corp. would not be held liable for misuse of its product.
If you do not agree, please discontinue use immediately and return product to place of purchase. This product is intended for off-road use and passenger
entertainment only.

3 | P a g e

*For off-road use and passenger entertainment only.

MOST-HUR31 Installation

1. Base-line the factory radio:
a. Source the radio to FM radio, adjust the volume to a comfortable listening setting
b. Center the balance and fade, center the bass and treble
c. Be certain there are no other problems with the factory stereo system before installing this

unit.

2. Remove the factory radio from the dash.

3. Connect the provided Plug & Play Harness to the main factory connector previously removed from

the OEM radio.

4. Remove the fiber optic plug from the OEM Harness (pry lock-tab).
a. Connect the provided fiber connector to the OEM fiber plug
b. Connect the new fiber assembly to the MOST-HUR31 interface at the fiber port.

5. Connect the RCAs among the Plug & Play Harness to the low-level pre-outs of the aftermarket

radio. NOTE: factory subwoofer (if equipped) is not adjustable through the amplifier, therefore will
not be adjustable with the aftermarket HU.

6. Make all remaining radio connections:
a. Ground (-) is provided from the HUR Black wire (PIN 10)
b. Constant Power (+) is provided from the HUR Yellow wire (PIN 1)
c. ACC 12v (+) power is provided from the HUR module RED wire (PIN 17). Connect the

vehicle’s Power Antenna wire (blue from T-Harness) to this ACC as well (often times, some
radios will not supply sufficient current to the vehicle power antenna. Power Antenna Note:
in some cars, the OEM power antenna wire location has moved 1 pin down (white, OEM
PIN12) – if so, either re-pin or jump around the connector to power from the Blue wire.

d. Reverse signal is provided from the HUR module Purple/White wire (PIN 7)
e. Remote from HUR (yellow/black) must connect to the remote OUT from the radio (typically

blue/white). This is used to UNMUTE the factory amplifier & to know that the radio is ready
to receive the video lock-out bypass.

f. IR signal is provided from the HUR module White wire (PIN 14). NOTE: If installing Kenwood

radio, connect white wire directly to remote-in wire from head unit. All other radios, connect
white wire to the red wire of the provided IR plug 3.5mm adapter cable and connect to
wired-remote in port on HU.

g. E-brake is provided from the HUR unit’s Green wire (PIN 15). Connecting this to the Parking

brake wire of the radio will bypass the video lock-out restriction until every key cycle* (if the
user desires – see menu settings).

7. Connect the RCAs from the HUR to the radio’s low-level RCA outputs. The high-level speaker leads

are not used with this unit. Connect the 18-pin plug from the Plug & Play Harness to the MOST-
HUR31 interface at the power port and proceed to MOST-HUR31 Menu Setup.