NHTSA ID Number: 10178303
Manufacturer Communication Number: PIT5745
TSB/Document Date: 2020-08-10
Summary
This Preliminary information communicates and issue with the memory seat module waking up the low speed GM lan bus and causing a battery draw.
Bulletin No.: PIT5745
Published date: 06/2/2020
Preliminary Information
PIT5745 Diagnostic Tips - Intermittent Parasitic Battery Draw
Below 40 Degrees F / Dead Battery / Slow Crank
Models
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VIN:
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Transmissions:
Envision
2018 - 2020
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LaCrosse
2018 - 2020
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ATS
2018 - 2019
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CT6
2018 - 2020
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CTS
2018 - 2019
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Escalade Models
2018 - 2020
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XT4
2019 - 2020
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XT5
2018 - 2020
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XT6
2020
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XTS
2018 - 2019
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Blazer
2019 - 2020
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Equinox
2018 - 2020
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Impala
2018 - 2020
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Malibu
2018 - 2020
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Camaro
2018 - 2020
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Corvette
2018 - 2019
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Silverado
2018 - 2020
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Suburban
2018 - 2020
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Tahoe
2018 - 2020
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Traverse
2018 - 2020
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Acadia
2018 - 2020
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Sierra
2018 - 2020
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Terrain
2018 - 2020
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Yukon Models
2018 - 2020
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Involved Region or Country North America
Condition
Some customers may comment on the following conditions when the ambient
temperature is below 40 degrees F:
• Dead battery/required jump start
• Slow crank
• Battery low state of charge, and if equipped, Auto Start/Stop inoperative
• IPC backlighting turning on intermittently while the vehicle should be asleep
• Keyless or passive entry/start inoperative
These concerns are not easily duplicated in the service bay or with temperatures
above 40 degrees F.
Note: The condition is intermittent and ONLY occurs when the vehicle has been
outside overnight or longer and the ambient air temperature is below 40F for
extended periods of time.
Cause
These conditions may be due to a low battery state of charge that is being caused by
one or more modules waking up the Low Speed GM LAN Bus. It has been found that
the Seat Memory Control Module (SMCM) could inadvertently wake up the Low
Speed GM LAN Bus when the ambient air temperature is below 40 degrees
F. This condition could apply to all SMCM a vehicle is equipped
with like: Driver K40, P assenger K40P, Left Rear K40LR and/or
Right Rear K40RR .
Correction:
Before any in depth diagnosis is performed, question the customer or inspect the vehicle for any type of
aftermarket equipment. If no aftermarket equipment is found, try to duplicate the conditions by leaving the
vehicle outside overnight in temperatures below 40 degrees F.
Note: Temperatures below 40 degrees F is critical to reproducing the condition.
Perform all steps as appropriate in the Battery Electrical Drain/Parasitic Load Test procedure in Service
Information. If an excessive battery draw is duplicated, as part of the Circuit/System Testing procedure, remove
the fuse(s) that powers the SMCM. Wait several minutes to see if the vehicle will return to an acceptable battery
draw level. If so, replace the appropriate SMCM. This condition could apply to all SMCM a vehicle is
equipped with lik e: Driver K40, P assenger K40P, Left Rear K40LR and/or Right Rear
K40RR .
Note: There may be more than one fuse which powers the SMCM.
If the battery draw does not return to an acceptable level with the SMCM fuse(s) removed, then continue with
normal SI diagnostics.
Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the
appropriate labor operation for which Seat Memory Control Module is replaced. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH) for coverage information.
Additional SI Keywords
B1325 C0800 B1517
Version History
Version
Modi ed
1
06/01/2020 - Created on.
© 2020 General Motors
. All Rights Reserved.
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TSB/Document ID: PIT5745
Replacement Service Bulletin Number:
MFR Communication Date: 2020-06-02
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SEATS
MFR Component System:
MFR Component Subsystem:
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