© MAHLE
Product Use | OBD-II Smartbox | �
OBD-II Smartbox | �
| �
en
Pins LED
Testing of the 16 pins individually will also begin immediately with
the following conditions:
y
To detect any voltage present on Car Manufacturer designated
pins No. 1, 3, 8, 9, 11, 12 and 13 (yellow color socket) and
OBD-II assigned protocol pins 2, 6, 7, 10, 14, 15 (blue color
socket) and pin 16 (red color socket) which is positive supply
12V or 24V.
y
When there is a presence of voltage detected at a particular
pin or other pins on the Manufacturer designated ones, the
LED at the socket will blink in different ways depending on
the voltage detected:
Manufacturer designated pins (yellow color socket)
a. If there is 12V present (below 11.8V or above 15.2V) in
any Manufacturer Designated pins – the respective LED
will blink slowly at interval of 1 sec between each blink.
(The ‘Caution – Check LED will illuminate).
b. If there is a negative voltage present in any Manufac-
turer Designated Pins – the corresponding LED will light
steady. (The ‘Caution – Check’ LED will illuminate).
c. If there is 24V present (below 23.8V or above 29.2V) in
any Manufacturer Designated Pins– the LED will blink
fast. (The ‘Caution – Check’ LED will illuminate).
OBD-II assigned protocol pins (blue color socket)
a. If there is 12V present (below 11.8V or above 15.2V) – the
respective LED will blink slowly at interval of 1 sec be-
tween each blink with a short beep alarm for 5 sec. (The
‘Caution – Check LED will illuminate).
b. If there is a negative voltage present – the corresponding
LED will light steady with a long beep alarm for 5 sec.
(The ‘Caution – Check’ LED will illuminate).
c. If there is 24V present (below 23.8V or above 29.2V)– the
LED will blink fast with a loud beep for 5 sec. (The ‘Cau-
tion – Check’ LED will illuminate).
If any of the above situations is encountered, do not plug in your
Scan tool. Please check and compare the OBD-II circuit connec-
tion with vehicle Repair Manual for the reason of the shorting.
This is because under normal circumstances when the ignition
key is OFF, the ECU is also in the OFF state and there will be no
communication signals or voltage output to the rest of the pins
except pin 4 which is chassis ground and pin 16, the positive
power output supplied from the battery direct.
