NST13165-2_A 2019-02-12
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TROUBLESHOOTING
SYMPTOM - KEYLESS ENTRY
4 Unlock Response Is Slow When Keychain Tag is Swiped
POSSIBLE CAUSE
CORRECTIVE ACTION
4.1.1
Determine if there is a failure in the ID location pins in
one of the Antenna/Readers and there is a “location
conflict” on the data bus. For example, the ground
input on pin #7 has failed (no ground) and the system
thinks there are two Master (Curbside) nodes present.
The Master node is the Curbside which controls the
data bus traffic. Unplug each Antenna/Reader and
observe the Mod-QC test. If the first test, which
identifies the Antenna/Reader location, indicates two
units with the same location ID, then you have found
the problem. Fix the connector or wire harness.
4.1
Data bus has failed due to wire harness or
connector problem
4.2
There is an internal short in the
Antenna/Reader causing a data bus issue
4.2.1
If you have verified there is no wire harness or
connector problem and all of the Antenna/Reader
locations are correctly identified, unplug the
Antenna/Reader from the wire harness and reconnect
it. Observe the Mod-QC Test. First the location code
will be flashed twice. Second, the data bus operation is
tested and if the data bus is present, the red LED will
flicker-flash 10-seconds (if the Antenna/Reader is at
the Curbside door, the flicker-flash is a short 3-second
burst). If the red LED does not flicker-flash, the data
bus circuit has failed. Replace the Antenna/Reader.
SYMPTOM - DATA BUS
1 Red Status LED on Antenna/Reader Flashes @ 1-Sec Rate When Door Unlocked -
Indicates a Data Bus Failure
POSSIBLE CAUSE
CORRECTIVE ACTION
1.1.1
If the harness is not shorted to power, disconnect the
wire harness connector for power and ground located
under the hood. Check different points in the wire
harness and see if the chassis ground is present. With
the wire harness disconnected from the truck, there
should be NO chassis ground detected. if there is a
ground detected, locate the problem and repair it.
1.1
There is a short in the wire harness
between the Antenna/Reader’s tan, red or
black wires
1.1.2
If the harness is not shorted to power or chassis
ground, it can be shorted to the ground or power wire
in the harness. With the harness disconnected from the
battery, check for +12V and ground between the power
and ground wires in the harness. If +12V or ground is
connected to the data wire (tan), locate the problem
and repair it.
