NST13308-M115-02_A
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2021-06-23
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Page 11
1. What to do if the Status LEDs Flash Data Bus Failure:
Possible Cause #1: Short in the Wire Harness
Actions To Take:
•
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, NO ground should be detected.
• If a ground is detected, locate the problem and repair it.
• If the harness is not shorted to power or chassis ground, then it can be shorted to the ground or power wire in the
harness. With the harness disconnected from the battery, check for +12VDC and ground between the power
and ground wires in the harness. If +12VDC or ground is connected to the data wire (tan), then locate the
problem and repair it.
Possible Cause #1: Two Readers with the Same Location Key
Actions To Take:
•
Run a QC test on each of the readers to determine which two readers have the same location key
and repair the location point in the wire harness.
• If the failure is not in the wire harness then it is in the reader so replace the reader.
2. What to do if the Unlock or Start Response is Slow When Swiped:
Actions To Take:
•
For a short or open in any of the wires (Tan-Data, Red-Power, Ground-White or Black), see Possible Cause #1
above.
Possible Cause #2: A Short or Open in the Wire Harness
TROUBLESHOOTING - DATA BUS
