Unscrew the shift knob counter
clockwise to remove.
Unclip and remove the cup
3
holder/parking brake cover and
shifter cover as one unit.
(Figure A)
DASH DISASSEMBLY
A
(Figure B)
Remove (2) Phillips screws from the
4
bottom of the radio/climate control
panel.
Open glove box, squeeze sides
5
together and let open fully then
remove (1) 10 MM bolt from the side
of the radio bracket.
D
(Figure C)
(Figure D)
B
C
1
99-7503
Rear of Electronic Climate Control
Rear of Radio/Climate Control Panel
2003-2004 MAZDA 6
Electronic Climate Control
6
Unsnap and remove radio/climate
control panel including climate control vents at the top.
Remove (4) Phillips screws securing
7
vents to radio/climate control panel
to remove.
Remove (8) Phillips screws securing
8
the electronic climate control to the
radio/climate control panel to
remove.
(Figure F)
(Figure G)
(Figure E)
DASH DISASSEMBLY
E
F
Remove (4) Phillips screws securing
9
the radio display harness bracket to
the radio chassis then unclip and
remove the radio display harness.
(Figure H)
H
G
2
A/C
99-7503
2003-2004 MAZDA 6
Manual Climate Control
Disconnect the negative battery
1
terminal to prevent an accidental
short circuit.
Unscrew the shift knob counter
2
clockwise to remove.
Unclip and remove the cup
3
holder/parking brake cover and
shifter cover as one unit.
(Figure A)
(Figure B)
DASH DISASSEMBLY
A
B
Remove (2) Phillips screws from the
4
bottom of the radio/climate control
panel.
Pull the climate control knobs off
5
and remove (2) Phillips screws from
behind knobs.
D
(Figure C)
(Figure D)
C
3
INSIDE
GLOVE BOX
99-7503
2003-2004 MAZDA 6
Manual Climate Control
Open glove box, squeeze sides
6
together and let open fully then
remove (1) 10 MM bolt from the side
of the radio bracket.
Unsnap and remove radio/climate
7
control panel including climate control vents at the top.
8
Remove (4) Phillips screws securing
vents to radio/climate control panel
to remove.
(Figure G)
(Figure E)
(Figure F)
DASH DISASSEMBLY
E
F
Remove the (2) small Phillips screws
9
securing the light bulb boards on
each side of the backlight dispersion
Note: Notice how they are posi-
bar.
tioned in the backlight dispersion bar
as they will be placed in the 99-7503
the same way.
H
(Figure H)
G
4
99-7503
2003-2004 MAZDA 6
Manual Climate Control
Remove (4) Phillips screws securing
10
backlight dispersion bar and knob
trim bezels.
Push the bottom edges of the knob
11
trim bezels from the front side to the
back and slide both pieces out as
one unit.
Remove (4) Phillips screws securing
12
the radio display harness bracket to
the radio chassis then unclip and
remove the radio display harness.
(Figure K)
(Figure I)
(Figure J)
DASH DISASSEMBLY
I
J
5
K
99-7503
REAR
VIEW OF
ELECTRON
IC C
LIMATE C
ONTROL
2003-2004 MAZDA 6
Electronic Climate Control
Clip the climate control knob outer
1
trim ring panel into the 99-7503
housing.
Align the screw holes in the climate
2
control and the radio housing panel
then push the climate control onto
the radio housing panel.
(Figure A)
(Figure B)
KIT ASSEMBLY
A
Secure the climate control with the
3
factory hardware removed in step 8
of the dash disassembly for
electronic climate control cars.
Unclip and remove the small oval
3
cover plate at the bottom center of
the factory radio and insert into the
99-7503 radio housing.
(Figure C)
Note: The 16 position to 16 position
harness supplied with the 99-7503
will NOT be used in vehicles with
electronic climate controls.
C
B
D
(Figure D)
6
99-7503
ASSEMBLED
INSTALLED
KIT ASSEMBLY
2003-2004 MAZDA 6
Manual Climate Control
Put the climate control knob outer
1
trim panel and the backlight dispersion bar together and clip into the
radio housing panel as one unit.
Note: You may have to push down
slightly on the middle of the unit to
ease in positioning it into the kit.
(Figure A, B, C )
Secure the unit with the factory
2
hardware removed in step 10 of the
manual climate control dash disassembly.
Secure the light bulb boards on each
3
side of the backlight dispersion bar
using the factory hardware removed
in step 9 in manual climate control
dash disassembly.
(Figure D )
A
B
Unclip and remove the small oval
4
cover plate at the bottom center of
the factory radio and insert into the
99-7503 radio housing.
D
E
(Figure E)
C
Note: The 16 position to
16 position harness supplied with the 99-7503
WILL be used in vehicles
with manual climate
controls.
(Figure F)
F
7
99-7503
DIN HEAD UNIT PROVISION
Slide the DIN cage into the Radio
1
Housing and secure by bending the
metal locking tabs down.
Slide the aftermarket head unit into
2
the DIN cage until secure.
Snap the Trim plate into the Radio
3
Housing.
(Figure B)
(Figure A)
KIT ASSEMBLY
A
(Figure B)
B
ISO DIN HEAD UNIT PROVISION
Mount the ISO Brackets to the head
1
unit with the screws supplied with
the unit.
Slide the head unit into the radio
2
opening until the side clips engage.
(Figure B)
Snap the Trim plate into the Radio
3
Housing.
(Figure A)
(Figure B)
A
B
8
99-7503
Apply To
Rear Of
Both Sides
FELT TAPE APPLICATION
Note: Due to differences in factory tolerances you may need to apply the provided felt tape to the
edge of the 99-7503 radio housing to relieve backlight bleed through.
1. Looking at edge of radio housing apply felt tape to inner edge (toward back of kit). If it is positioned to closely to the outer edge you may be able to see it once it is in the dash.
9
99-7503
CLOCK
SET
DIMMER
AMB
DISPLAY CUSTOMIZATION
1. Press and hold the Clock button in the factory display until “Set Text” is displayed, then release
the button. Settings will begin with the first character location. Use the Set button to select the
desired character then press the
available character locations.
2. Once the desired text is entered if you do not touch any buttons for 10 seconds the display will
“Saved Text” and your text will be saved.
read
3. To set the clock press and hold the Clock button until “Hr. Adjust” is displayed then use the Set
button to select the desired hour.
4. Press the Clock button again and the display will read “Min. Adjust” then use the Set button to
select the desired minutes.
Note: If equipped with a
Dimmer button it will still function as normal.
AMB button to select the next character location. There are 10
10
99-7503
1
3
2
FINAL ASSEMBLY
FINAL WIRING and ASSEMBLY
A
B
C
D
1
Locate the factory wiring harness in the dash. Use the supplied wire harnesses
and make the connection as shown. (Isolate and individually tape off the ends
of any unused wires to prevent electrical short circuit.)
Make wiring conections using the EIA color code chart shown below and the instructions included with the
head unit. Metra recommends making connections as shown below; Strip, Splice, Solder, Tape. Isolate and
individually tape off ends of any unused wires to prevent electrical short circuit.
A) Strip wire ends back 1/2"
B) Twist ends together
C) Solder
D) Tape
*NOTE: When Black a wire is not present, ground radio to vehicle chassis.
All colors may not be present on all leads due to manufacturer’s specifications.
Plug the 5 way connector (supplied with the 99-7503) into location 1 on the back of the
2
99-7503 housing (see diagram).
Plug the 16 way connector that you removed from the factory radio into location 2 on the back
3
of the 99-7503 housing (see diagram).
4
On manual climate control vehicles only, plug the 16 way connector (supplied with the
99-7503) into location 3 on the back of the 99-7503 housing
(see diagram). Automatic climate control vehicles will not use this harness.
5
Re-connect the negative battery
terminal and test the unit for
proper operation.
Left Front (-) . . . . . . White / Black
Right Rear (+) . . . . . Violet
Right Rear (-). . . . . . Violet / Black
Left Rear (+) . . . . . . Green
Left Rear (-) . . . . . . . Green / Black
6
Reassemble radio and dash
assemblies in reverse order of
disassembly.