HU Modification (Adding L716 jumper)
HU WHICH DOES NOT RECOGNIZE GROM-I-MAZ
There are at least two versions of Panasonic (Matsusita) HU on the
market.
If your Mazda6 stereo is manufactured in 2003 - 2005 - chances are HU does not
recognize GROM-I-MAZ.
This is because newer HUs do not have the zero ohm register
on the PCB location L716.
To solve this problem, you must take the HU out, open HU (it voids warranty) and solder a Jumper or a 0-ohm chip register on
location L716.
Doing this requires
soldering skills, if you
are not a skilled engineer ask your friend who has skills.
IMPORTANT NOTICE
Neither of the owner of this site nor who's name appeared on this site gives you
any guarantee about the information. All responsibilities doing this is yours.
There must be reasons why Mazda removed
L716 chip which I do not know, play at your own risk.
HOW TO PUT JUMPER
1.CHECK YOUR HEAD UNIT FIRST
As described above, this modification is required only for some HUs not all. Before you open HU, try the following steps to test your HU.
a. Connect GROM-I-MAZ to your HU
b. Turn on your HU
c. Play CD as usual
d. Press CD button once again
If the display changes as below and CD play stopped, you DO NOT need the modification.
If you do not see above display and CD keeps playing, your HU needs modification. Proceed to step 2.
2.TAKE YOUR HU OUT OF MAZDA6
I do not describe here how to remove the HU from the car (sorry I never did it.) Please consult other sources or web site for detailed information.
The first and the hardest part is removing cup holder.
3.OPEN HU
(Photo taken by CHACHAJIRO)
This is the PCB you are going to work with. Click above picture to see the area where L716 locate.
(Photos taken by CHACHAJIRO)
Click each pictures for exact location of L716.
Bridge L716 soldering pads with thin wire. Be careful not to short other circuits. Left picture above shows L716 open and right picture shows 0ohm chip register soldered.
Another close up of L716 without jumper.
(Photo taken by SIGURE)
