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Coastal Electronic GMX550 LOCKPICK Installation Manual

Made by: Coastal Electronic
Type: Installation Guide
Category: Car Navigation system
Pages: 10
Size: 0.58 MB

 

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BLUETOOTH MUTE 

GROUND

12V CONSTANT

12V ACC OUTPUT

REVERSE CAM POWER

ADDITIONAL CAM POWER

RIGHT CAM POWER 
TO LOCKPICK ORANGE WIRE

LEFT CAM POWER 
TO LOCKPICK ORANGE WIRE 

 TO LOCKPICK BLACK GROUND WIRE

 TO LOCKPICK BLACK GROUND WIRE

 TO LOCKPICK BLACK GROUND WIRE

 TO LOCKPICK BLACK GROUND WIRE

PROGRAMMING 

DIP SWITCHES

(OPTIONAL)

 A/V OUTPUT

AUX A/V INPUT

IPOD/IPHONE/ITOUCH/IPAD
CONNECTION

UNPLUG ORIGINAL RADIO 

CONNECTORS THEN PLUG IN HERE

PLUG AND PLAY

NO OTHER CONNECTIONS ARE 

NECESSARY 

USB INPUT

GMX550 LOCKPICK

INSTALLATION OPTIONS

COPYRIGHT 2010 COASTAL ELECTRONIC TECHNOLOGIES, INC.

ADD YOUR BLUETOOTH

HANDSFREE KIT

(CONNECTIONS BUILT

INTO GMX550 HARNESS)

USE HANDSFREE KIT

MICROPHONE

REAR CAM POWER 
TO LOCKPICK RED W/BLACK WIRE 

AUDIO - IN

AUDIO + IN

FRONT CAM POWER 
TO LOCKPICK ORANGE W/BLACK WIRE

 


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Coastal Electronic Technologies, Inc. 

 GMX550 Lockpick™ 

 

 

Thank you for your purchase of the Coastal Electronic Technologies, Inc. GMX550 LOCKPICK. The 

GMX550 Lockpick is the replacement for the GMX322 and is the latest in a long history of Lockpicks designed to 
enable full and additional functionality to your factory GM navigation system. The GMX550  Lockpick 
incorporates many important standard features including: 
 

 

NAVIGATION ADDRESS INPUT  in motion

 

 

DVD play and AUX input fully enabled (in equipped vehicles) 

 

 

Audio/Video input

 

 

Special cables and connectors for plug-in installations that are completely reversible

 

 

                                    PLUS - NEW FOR GMX550

 

 

Advanced use of steering wheel controls for Lockpick operation

 

 

Full text menus on your factory instrument panel of all Lockpick functions

 

 

USB update ability to keep current with new software revisions

 

 

Front/rear/left/right camera input and control for automatic operations or manual viewing anytime

 

 

iPod/iPad/iPhone/iTouch connection with activation of all available video functions

 

 

Use of steering wheel controls to search and play songs on iPhone/iTouch devices

 

  

 

 

At this time, Coastal Electronic Technologies, Inc. would like to recommend that you have this installation 
completed by a certified mechanic or someone familiar with automotive electronics. This installation, while not time 
consuming, does require careful attention to detail and precise following of installation instructions. 
Coastal Electronic Technologies, Inc.  accepts no responsibility due to the improper installation or use of this 
product.  Installation and / or use of this product implies and signifies user acceptance of this term of use.  Please 
adhere to all driving laws in your state. 

 

INSTALLATION 

OVERVIEW  

1.

 

Remove radio trim panels to gain access to radio mounting screws. 

2.

 

Remove the radio partially to expose rear connectors. 

3.

 

Unplug factory connectors from radio and then plug them into Lockpick harness connectors.  

4.

 

Plug in Lockpick harness connectors to radio. 

5.

 

Connect camera(s) power and ground if installing aftermarket system(s). 

6.

 

Reassemble and enjoy.  

 
This written guide will detail the connections for the Lockpick harness and provide reference for general installation and 
operations. The GMX550 is universal for many different GM models and individual dash disassembly is not addressed in this 
manual.  

 

1.

 

Start with the car and radio turned off. The GMX550 is designed with a dual “T” harness, equipped with factory male 
and female connectors for direct connections to your screen. With access to the rear of the screen, unplug the 
matching 

Black and Brown connectors 

and plug them into the female connectors of your LOCKPICK. Then plug the 

male connectors of the LOCKPICK harness into the earlier factory locations. The connectors are keyed and cannot be 
plugged in to the wrong location.  For most installations, the disassembly needed to get to the rear of the screen will 
consist of “popping” loose the trim around the face of the radio to expose the 7mm or 10mm bolts holding the radio in 
position. Remove the bolts and the radio can be tilted rearward to view the connectors needed. The trim around the 
face of the radio is held in place with spring loaded friction locks which sometimes can require extra pressure to 
release. Videos and have been provided on the CoastalEtech.com website to provide you assistance as well as details 
and photos for Cadillac Escalade installations.

 

 


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2.

 

The GMX550 Lockpick is a simple Plug-N-Play interface however additional wiring is labeled and available on your 
Lockpick harness. These connections may be used for your aftermarket accessory power needs.  
 
RED – 12V ACC power output (Limit 1 amp) This is an output, do not connect to vehicle wiring. If your accessory 
requires more than 1 amp, use this power output to control a relay connected directly to battery power.   
YELLOW – 12V constant battery power output 
BLACK – GROUND connection 
ORANGE W/BLACK stripe – 12V rear camera power output (use this power source for your aftermarket rear 
camera or for full control of your factory camera see step 3 below) 
RED W/BLACK stripe – 12V ADDITIONAL camera power output (use this as the power source for front/left/right 
view camera(s)) 
 

3.

 

If you have a FACTORY REAR VIEW CAMERA

 and would like to be able to view and control it

 

when in DRIVE, 

extend the ORANGE W/BLACK stripe 12V REVERSE wire labeled in your GMX550 harness. A crimp connector is 
already attached for your convenience. Route the wire along the edge of the console and down to the small silver 
module under the passenger seat. Slide the seat all the way back to view the connector on the front or side edge. 
Unplug the connector and cut the Blue wire pictured in the photo below (end wire, left side, from the back of the 
plug).  Attach the ORANGE W/BLACK stripe GMX550 wire to the blue wire on the vehicle connector. The other cut 
end of the wire in the factory harness should be insulated and left disconnected. Do not connect the Lockpick Orange 
w/black stripe wire without cutting the BLUE factory wire or improper operation will occur.  Also, early year Enclave 
and Acadias may place the camera module in the rear instead of under the passenger seat. Refer to website at: 

http://coastaletech/Acadia.htm

 for installation help.

 For 2008 and later H2 and all 2009-11 vehicle installations, extend 

and run the GMX550 BLUE wire to the back of the vehicle and connect directly to the rear view camera connector 
blue wire. Refer to website at:

  

http://coastaletech.com/Hummer.htm

  

for example install pictures. 

 

 

 

 

 

3. 

OPTIONAL FACTORY CAMERA 

LOCKPICK CONNECTION DETAIL

 

 

Unplug connector from module under 
passenger seat. 

 

Cut blue wire 

 

Attach Lockpick Orange w/Black stripe  
wire to blue wire of factory connector and 
plug connector back into module 

 

Crimp completed connection Cover 
remaining loose end of blue wire left in 
factory harness and leave disconnected 

 

Anytime factory camera use is now enabled 
by the GMX550 

Unplug connector from camera module under passenger seat 
and pull into view as shown. Cut and strip pictured blue wire as 
demonstrated and attach to wire included with your Lockpick.

INSTALLATION DETAIL 
 

Unplug the matching connectors on 
the rear of the radio. Plug them into 
the matching connectors of the 
Lockpick harness. Then plug the 
remaining Lockpick harness 
connectors back into the original 
radio locations.  The connectors are 
unique and keyed so you cannot plug 
them into the wrong location. Insert 
the connectors fully until they click 
or are locked into place. 

 


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4.

 

For all aftermarket cameras, plug in the video connector from your camera to the labeled input (front, rear, left, 
right) and connect all power(s) connections to the RED W/BLACK stripe camera power wire on your GMX550 
harness. Connect the ground(s) for your camera power to the Black ground connection on the GMX550 harness. 

 

OPERATION 

To activate the GMX550 LOCKPICK, press the MUTE (VOICE) button on your steering wheel (4) four 
times within 4 seconds as demonstrated below. Text with menus and options will appear on your 
instrument panel.

 

 

     

 

 
 
The menus of the GMX550 are controlled using your steering wheel NEXT UP  

and NEXT DOWN 

 

buttons to scroll up and down through the Lockpick menus.  

     

 

 
 

Select any item or option using the SEEK  

button.

 You may also turn off any function without navigating 

through the text menus by simply pressing the MUTE button 2x.

 

 

 


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The text will remain on your instrument panel for approximately 10 seconds after your last Lockpick 
operation. You may turn it off immediately by pressing the MUTE button 4x. When activated, the 
Lockpick text will always return to last function allowing quick operation for frequently used options. 
 
A complete list of text and options for the GMX550 are listed below: 

 

 

   

 

 

 

 

 

  

 

 

 

 

 

 

 

  

 

 

 

  

 

 

 

 

 

 

 

 

 

 

          

  

 

 

 

  

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

(Default)

 

Indicates

 

that

 

headrest

 

output

 

is

 

selected

 

to

 

copy

 

the

 

Audio/Video

 

sent

 

to

 

the

  

front screen.

HROUT SCRN 

      

SELECTED

 

Set

 

different

 

options

 

for

 

video

 

and

 

audio

 

outputs

 

to

 

external

 

screens

 

or

 

headrest

 

inputs.

  

HEADREST OUT        

OPTIONS PRESS >

 

Activates

 

Right

 

camera

 

if

 

installed.

 

Camera

 

must

 

be

 

powered

 

by

 

the

 

GMX550

 

for

 

this

 

function.

  

VIEW RIGHT CAM 

     

PRESS > TO TURN ON

Activates

 

Left

 

camera

 

if

 

installed.

 

Camera

 

must

 

be

 

powered

 

by

 

the

 

GMX550

 

for

 

this

 

function.

  

VIEW LEFT CAM        

PRESS > TO TURN ON

Activates

 

Front

 

camera

 

if

 

installed.

 

Camera

 

must

 

be

 

powered

 

by

 

the

 

GMX550

 

for

 

this

 

function.

  

VIEW FRONT CAM 

     

PRESS > TO TURN ON

Activates

 

Rear

 

camera

 

(factory

 

or

 

aftermarket).

 

Camera

 

must

 

be

 

powered

 

by

 

the

 

GMX550

 

for

 

this

 

function.

 

See

 

installation

 

options.

 

(step

 

3)

VIEW REAR CAM        

PRESS > TO TURN ON

Automatically

 

places

 

the

 

radio

 

in

 

the

 

XM

 

mode

 

and

 

activates

 

audio

 

+

 

AUX

 

A/V

 

text

 

on

 

screen.

 

If

 

AUX

 

video

 

is

 

selected,

 

picture

 

is

 

viewed

 

on

 

radio

 

screen

  

ACTIVATE AUX A/V      

PRESS > TO TURN ON

Automatically

 

places

 

the

 

radio

 

in

 

the

 

XM

 

mode

 

and

 

activates

 

audio

 

+

  

IPOD

 

text

 

on

 

screen.

 

If

 

IPOD

 

video

 

is

 

selected,

 

picture

 

is

 

viewed

 

on

 

radio

 

screen

  

ACTIVATE  IPOD      

PRESS > TO TURN ON

DVD

  

override

 

activation

 

has

 

no

 

time

 

limit.

 

You

 

can

 

turn

 

it

 

off

 

manually

 

or

 

it

 

will

 

reset

 

to

 

off

 

when

 

the

 

car

 

is

 

taken

 

out

 

of

 

Drive

 

or

 

turned

 

off.

  

DVD IN MOTION        

PRESS > TO TURN ON

NAV

 

input

 

override

 

will

 

automatically

 

time

 

out

 

after

 

60

 

seconds

 

when

 

activated.

 

NAV IN MOTION        

PRESS > TO TURN ON

Initial

 

display

 

on

 

instrument

 

panel.

 

Press

 

steering

 

wheel

  

 

and

 

to

 

view

 

primary

 

menus.

 

GMX550 LOCKPICK 

SCROLL FOR MENUS

 

 


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If

 

you

 

install

 

side

 

cameras,

 

select

 

ON

 

to

 

have

 

them

 

display

 

automatically

 

when

 

turns

 

signals

 

are

 

applied.

  

AUTO TURN CAMS  

     

PRESS > TO TURN ON

If

 

you

 

install

 

a

 

front

 

camera,

 

select

 

ON

 

to

 

have

 

it

 

automatically

 

display

 

at

 

slow

 

speeds

 

to

 

aid

 

in

 

parking,

 

AUTO FRONT CAM  

     

PRESS > TO TURN ON

Select

 

OFF

 

if

 

you

 

do

 

not

 

want

 

the

 

screen

 

to

 

switch

 

to

 

a

 

rear

 

camera

 

while

 

in

 

reverse.

 

Default

 

is

 

ON.

  

AUTO REAR CAM        

PRESS > FOR OFF

Select

 

to

 

allow

 

reverse

 

cam

 

or

 

other

 

automatic

 

cam

 

when

 

activated,

 

to

 

interrupt

 

and

 

show

 

on

 

headrest

 

or

 

external

 

screens.

 

HR AUTO CAMS        

PRESS > FOR ON

Select

 

this

 

option

 

to

 

modify

 

GMX550

 

operations

 

to

 

match

 

your

 

vehicle

 

or

 

desires

  

ADDITIONAL OPTIONS 

 

This

 

displays

 

the

 

current

 

software

 

revision.

 

The

 

GMX550

 

can

 

be

 

updated

 

by

 

the

 

user

 

via

 

USB

 

when

 

desired.

 

SOFTWARE REVISION 

1.XXXXXX

 

Select

 

to

 

Exit

 

Headrest

 

Output

 

Options

 

and

 

return

 

to

 

beginning

 

of

 

menus

   

  EXIT 

      

   

 

Select

 

to

 

send

 

Right

 

Camera

 

Video

 

to

 

an

 

external

 

screen

 

or

 

headrests

   

HROUT RIGHT CAM 

     

   > TO SELECT

 

Select

 

to

 

send

 

Left

 

Camera

 

Video

 

to

 

an

 

external

 

screen

 

or

 

headrests

   

HROUT LEFT CAM       

   > TO SELECT

 

Select

 

to

 

send

 

Front

 

Camera

 

Video

 

to

 

an

 

external

 

screen

 

or

 

headrests

   

HROUT FRONT CAM 

     

   > TO SELECT

 

Select

 

to

 

send

 

Rear

 

Camera

 

Video

 

to

 

an

 

external

 

screen

 

or

 

headrests

   

HROUT REAR CAM 

     

   > TO SELECT

 

Select

 

to

 

send

 

AUX

 

Audio/Video

 

to

 

an

 

external

 

screen

 

or

 

headrests

   

HROUT AUX 

      

   > TO SELECT

 

Select

 

to

 

send

 

iPod

 

Audio/Video

 

to

 

an

 

external

 

screen

 

or

 

headrests

   

HROUT iPod 

      

   > TO SELECT

 

 


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The GMX550 Lockpick text is viewed on the instrument panel and is compatible with ONSTAR and warning 
messages. 

If a door is opened or a vehicle fault occurs while the Lockpick text is on the screen, the Lockpick allows 

the OEM messages to have priority

. Also, during the viewing of the Lockpick text, or while scrolling through the 

Lockpick menus, the vehicle may have moments when the viewing of the Lockpick text is not allowed and the 
Lockpick text will not immediately appear or may flash once before staying on. This is normal and is part of the 
design.    
 
Immediately after the vehicle is turned on, the radio may download large amounts of information from XM radio 
services. During these first moments, various communication systems in the vehicle are at capacity and the 
Lockpick does not interfere with this process. Therefore, for best results allow approximately 30 seconds after 
starting the car before activating and accessing the Lockpick instrument panel text. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Exits

 

OVERRIDE

 

CONFIG

  

and

 

returns

 

user

 

to

 

the

 

top

 

menu.

  

EXIT 

 

Override

 

MODE

 

4

 

provides

 

an

 

automatic

 

DVD

  

override

 

without

 

button

 

presses

 

for

 

Cadillac

  

and

 

early

 

2007

 

GM

 

radios

OVERRIDE MODE 4      

PRESS > TO TURN ON

Override

 

MODE

 

3

 

is

 

used

 

for

 

Cadillac

 

applications

 

where

 

the

 

user

 

wants

 

to

 

press

 

a

 

button

 

before

 

DVD

 

override

     

OVERRIDE MODE 3 

     

PRESS > TO TURN ON

Override

 

MODE

 

2

 

is

 

used

 

for

 

many

 

GMC

 

and

 

Acadia

 

models

    

OVERRIDE MODE 2 

     

PRESS > TO TURN ON

MODE

 

1

 

is

 

the

 

default

 

DVD

 

and

 

NAV

 

override,

 

compatible

 

with

 

most

 

vehicles.

  

OVERRIDE MODE 1 

SELECTED

Select

 

this

 

option

 

to

 

modify

 

the

 

method

 

for

 

DVD

 

and

 

NAV

 

override.

 

These

 

modes

 

allow

 

the

 

GMX550

 

to

 

operate

 

in

 

a

 

variety

 

of

 

vehicles

  

OVERRIDE CONFIG 

 

Exits

 

ADDITIONAL

 

OPTIONS

 

and

 

returns

 

user

 

to

 

the

 

top

 

menu.

  

EXIT 

 

**During the time that you are using the 60 second NAV IN MOTION feature to input an address, 
active map tracking is not occurring (if you switch back to the map, the map will not be moving or 
pinpointing your exact location). Standard navigation functions will automatically return after 1 
minute or you can turn off the NAV IN MOTION function using your steering wheel buttons to 
immediately resume normal nav operation. Also, if you are using OVERRIDE MODE 1 or 2,  the 
GMX550 needs to block navigation tracking when you activate the DVD IN MOTION function. 
Simply turn off DVD IN MOTION if you switch back to the map during DVD play for normal 
operation. 

 


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USB UPDATING 

 

 

(make sure module is also connected to Lockpick harness and vehicle) 

 

 

Your Lockpick interface includes the ability to be updated via a USB connection to a PC. Located on your 

Lockpick module is a common  mini USB jack which can be connected to the USB jack on a laptop computer using 
a standard USB mini to USB connection cable . These cables are the same ones used to connect most 
camaras/camcorder/phones, etc. to a computer and are available in virtually all electronic departments.     
 

A software program is available for download and installation on our website at 

www.coastaletech.com/usbupdate.htm

   Download the application software and save it to your computer. Open the 

folder and select the SETUP file to install the FIRMWARE UPDATER program on your computer. When 
prompted, install the USB drivers included in the UPDATER software. On our website we provide updates and 
changes that will use the FIRMWARE UPDATER program to allow simple updates to your Lockpick module.  
 

To perform an update to your module, 

download and save the desired Lockpick update from our website. 

Make sure the module is plugged into the Lockpick harness and connected to your vehicle with the key off. Plug in 
the USB cable to the Lockpick module and your computer. Wait while your computer recognizes the new device, 
then open the FIRMWARE UPDATER program on your computer and when prompted, browse to the location 
you saved the desired update. Start the update as directed in the software and do not stop the process once begun. 
After completion, disconnect the USB cable and start the car to use and explore the installed firmware changes. 
 

Module DIP Switches: 

 

 

The Lockpick module is equipped with programming DIP switches which allow the user to select additional 
options which may be necessary for proper operation in specific vehicles.   

 

For standard installations, all DIP switches should be left in the UP position. 

 

If the switch settings are changed while the module is still plugged in, the Lockpick will ignore the changes 
until it has been unplugged and then plugged back in. 

 

 

For early build 2007 Cadillac Escalade vehicles (manufacture date 2005-early 2006),  DIP switch 1 should 
be placed in the DOWN position with all the rest left in the UP position.

 You can determine your build date 

by looking at the driver door tag and noting when the vehicle was manufactured. This special Lockpick 
programming setting will allow Lockpick text to display on the instrument panel on the early build 2007 
Cadillac Escalades. 

 

 

 

Place switch 5 Down to block factory DVD video in motion. With switch 5 Down, the GMX550 will not 
allow the DVD to play on the front screen while the vehicle is moving. 

ENJOY YOUR LOCKPICK! 

 


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GMX550 iPod/iPad/iPhone/iTouch Operation 

 

 

The GMX550 includes functions to allow Audio and Video from Apple devices to play 

through your factory sound system as well as for it to be viewed on your factory radio screen.  
 

 

The GMX550 will automatically enable the video output function if it is available on your 
connected device. This includes all iPod/iTouch/iPad/iPhone devices which support 

video output. 

 

It will also detect if your connected device supports iPod OUT graphical functions. 

Currently this function is available on iPhone/iTouch products which are using operating 
system 4.0 or greater. If your iPhone or iTouch is not up to date with the current Apple 
software, simply connect it to your computer and activate iTunes. You will be prompted 

to update free of charge to the newest software available. 

 

When the “ACTIVATE iPod” option is selected from the GMX550 text, the GMX550 will advance 
the radio automatically to the XM mode on your radio (current XM subscription is not 

necessary).  

 

If the connected device is an iPhone or iTouch with software 4.0 or greater

, the 

radio video will activate and display the iPod OUT audio control graphical interface 
as shown below. 
 

 

 

 
 

         

 

 
 

 

After

 

a

 

song

 

is

 

playing,

 

turn

 

tuning

 

knob

 

to

 

advance

 

forward

 

or

 

backward

 

in

 

playlist.

 

 
 

Use

 

SRCE

 

button

 

to

 

Go

 

Back

 

one

 

level

 

in

 

search.

 

 
 

Press

 

Mute

 

2x

 

to

 

exit

 

GMX550

 

iPod

 

mode

 

or

 

press

 

4x

 

to

 

display

 

instrument

 

panel

 

text

 

and

 

options.

 

Use

 

SEEK

 

UP

 

button

 

to

 

scroll

 

UP

 

on

screen

 

radio

 

selections.

 

For

 

long

 

lists,

 

hold

 

to

 

search

 

up

 

alphabetically.

 

 
 

Use

  

>

 

button

 

to

 

select

 

highlighted

 

option.

  

After

 

song

 

has

 

been

 

selected,

 

>

 

button

 

can

 

also

 

be

 

used

 

to

 

toggle

 

between

 

play

 

and

 

pause.

 

 

Use

 

SEEK

 

UP

 

button

 

to

 

scroll

 

DOWN

  

on

screen

 

radio

 

selections.

 

For

 

long

 

lists,

 

hold

 

to

 

search

 

down

 

alphabetically.

 

Selections

 

displayed

 

for

 

Playlists,

 

Artists,

 

Albums,

 

Songs,

 

Genres,

 

Composers,

  

can

 

be

 

controlled

 

by

 

your

 

steering

 

wheel

 

buttons.

  

 


background image

 

 

If you wish to exit the iPod OUT graphical interface and perform audio searches directly 
from your iPod device, or if you wish to access for viewing the video titles contained on 

your device, press the SEEK > button on your radio face.  
 

      

 

 

After exiting the iPod OUT graphics, the touch screen on your iPhone/iTouch is restored 
and searches for music videos, personal videos as well as full length movies stored on 

your device can be searched and selected. After selecting the video of your choice, the 
picture can be displayed on your front screen by selecting SEEK < button (Video ON) on 

your radio face as shown above. Press the same button SEEK < on the radio to turn the 
video off to your front screen and return to the radio view above. 

 

 

If your Apple device does not support iPod OUT audio graphical searches

, the 

GMX550 will automatically detect this when the iPod mode is selected and display 
the above screen.  
 

o

 

The audio manually selected from your iPod will automatically play through 
your factory sound system. 

o

 

You may also manually search your iPod for music videos, personal videos 
as well as full length movies. To display your selection on the front screen, 

select the SEEK < button (Video ON) on your radio face.  Press the same 
SEEK < button on the radio to turn the video off of your front screen and 

return to the radio view above. 

 

Turn

 

OFF

 

the

 

iPod

 

OUT

 

function

 

in

 

your

 

iPhone/iTouch

 

by

 

pressing

  

SEEK

  

>

 

button

 

on

 

your

 

radio.

 

The

 

on

 

screen

 

text

 

will

 

remind

 

you

 

that

 

Audio

 

Search

 

(iPod

 

OUT)

 

can

 

be

 

returned

 

to

 

by

 

pressing

 

the

 

SEEK

 

>

 

on

 

the

 

radio.

 

 
 

The

 

Video

 

input

 

on

 

your

 

front

 

screen

 

can

 

be

 

manually

 

activated

 

or

 

turned

 

off

 

anytime

 

while

 

in

 

the

 

GMX550

 

iPod

 

mode

 

by

 

selecting

 

the

 

SEEK

 

<

 

button

 

on

 

the

 

radio.