PIT5993A

Bulletin No.: PIT5993A
Published date: 04/25/2023
Preliminary Information
PIT5993A No Crank Due To Dead Battery / Battery Draw /
Unwanted Alarm
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Cadillac
Escalade Models
2021 - 2023
All
All
All
All
Chevrolet
Suburban
2021 - 2023
All
All
All
All
Chevrolet
Tahoe
2021 - 2023
All
All
All
All
GMC
Yukon Models
2021 - 2023
All
All
All
All
Involved Region or Country North America
Additional Options (RPO)
Condition
Cause
Theft-deterrent alarm system RPO UTT Or UTR
Some customers may comment on a low or dead battery, no crank due to a dead
battery or unwanted alarm.
These concerns could be caused by high resistance in the glass breakage loop,
which is shown below with a dotted red line. The glass breakage loop consists of the
rear window defogger grid and each rear quarter glass, which are all connected in
series. Normally, the complete glass breakage loop should have less than 20 ohms
of resistance to ground. If there is high resistance or a break at any place in this
series circuit, it could cause the condition.
Note: In some cases, the battery draw can only be duplicated if the vehicle is
completely closed up (all doors and hood latches tripped) and the vehicle is locked,
but in other cases the vehicle does not need to be closed and locked up.
Correction:
To test the glass breakage loop, disconnect the battery and the BCM X4 and X7 connectors. Using the correct test
probe (EL-38125-58) check for proper terminal tension at the BCM X7 terminal 27. If terminal tension is good
then use an ohmmeter to check the resistance of the glass breakage loop to the BCM ground. Do this by
connecting one lead of the ohmmeter to the BCM ground at connector X4 terminal 24 or 25 and the other
ohmmeter lead to terminal 27 of the BCM X7 connector. Measure the resistance.
If the resistance to ground is greater than 20 ohms, then inspect the glass breakage loop for poor connections,
which could occur at any point in the series circuit, shown above. The most common areas seen are the
connections at either of the rear quarter glass assemblies.
NOTE: In some cases, it has been found that the connection issues at the rear quarter glasses were caused by the
installation of aftermarket window tint, decals, stickers, etc. and these types of failures are NOT covered under
warranty.
If the resistance to ground is less than 20 ohms, then the loop resistance is within spec, but if you are dealing with
an intermittent issue then inspect and manipulate the glass breakage loop connections/wiring to see if the
resistance increases. Repair any points of high resistance.
Warranty Information
For vehicles repaired under warranty, please use the appropriate warranty labor operation based on the actual
cause and repair.
NOTE: In some cases, it has been found that the connection issues at the rear quarter glasses were caused by the
installation of aftermarket window tint, decals, stickers, etc. and these types of failures are NOT covered under
warranty.
Additional SI Keywords
draw lo low Parasitic
Version History
Version
Modi ed
2
03/23/2023 -Created on.
04/25/2023 - Update to the Cause, Correction and Warranty sections
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