ITB14054

Classification:
Reference:
Date:
EL14-051
ITB14-054
November 20, 2014
2011-2015 QX56/QX80; TIPS FOR DIAGNOSING
DISABLED AUTO BACK DOOR OPERATION
APPLIED VEHICLE: 2011 – 2013 QX56 (Z62)
2014 – 2015 QX80 ((Z62)
SERVICE INFORMATION
If the auto back door will not operate automatically (operates only in manual mode), first note some conditions
that may cause this:

Is DTC B2420 set as “current” in the back door control unit? If the auto back door “CLOSE SW” (close
switch) state does not change from ON to OFF after 3 attempts to close the auto back door, B2420 will
be set and the auto feature will be disabled.*
NOTE: Refer to the Electronic Service Manual (ESM), section DLK – Door & Lock, for further
information on close switch operation and/or circuit diagnosis as applicable.

Has an object repeatedly prevented the auto back door from closing completely? This will set a current
B2420 DTC and disable the auto back door function until the DTC is cleared.*
 Instruct the customer to not place objects in the cargo area where they will contact or obstruct the
closing of the auto back door.

Is an object currently stuck in the latch or preventing the auto back door from closing?
 Remove the object, clear B2420 and confirm correct operation of auto back door.*
*Disconnect/reconnect the vehicle’s 12V battery to change B2420 from current to past and then use
CONSULT-III plus and select AUTOMATIC BACK DOOR CONTROL UNIT / DATA MONITOR to
check for correct operation of the auto back door close switch.

Before disconnecting the vehicle’s 12V battery record the customer’s audio, etc. settings first,
then reset them after reconnecting the battery.
Infiniti Bulletins are intended for use by qualified technicians, not 'do-it-yourselfers'. Qualified technicians are properly trained
individuals who have the equipment, tools, safety instruction, and know-how to do a job properly and safely. NOTE: If you believe
that a described condition may apply to a particular vehicle, DO NOT assume that it does. See your Infiniti retailer to determine if this
applies to your vehicle.
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