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Addendum C – OBDII Cable Modification for Hardwired Ignition Sense
For certain vehicles with OBDII data connectors, the Ignition Sense provided by the OBDII connection may be inconsistent,
typically resulting in missing trips reported in the Nero portal. To alleviate the problem, the Ignition Sense may be hardwired to
a vehicle ignition source rather than the OBDII connector.
This addendum describes the necessary modification to the OBDII connector cable to provide hardwired Ignition Sense to the
66xx device.
Below is an image of the unmodified 20-pin Molex connector on the OBDII cable.
Steps to Modify the Cable
Important note: please complete all cable modifications prior to
connecting the cable to either the 66xx device or the OBDII port.
1.
The white "loop" that connects pins 7 and 15 is the ignition sense
wire. Snip this loop in half, creating separate connections to pins 7
and 15.
2.
Extend the white wire connected to pin 15. During installation,
this extension is hard-wired to an available ignition source within
the vehicle. It is recommended that a 3A fuse be connected to this
extension.
3.
Connect the white wire on pin 7 to the power source on pin 8 by
splicing the white wire onto the red power wire.
4.
The final result will look like the picture to the right.
rev 2020.08.05
Page 10 of 11
Pin 1
Pin 2
installation guide
installation guide
Nero 66xx Beacon Family
Pin 19
Pin 20
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