Who would have thought?

This TSB applies to a range of GM vehicles where the PPS (passenger presence system) may command the seat belt reminder chime and passenger airbag indicator on, when electronic devices or conductive objects are placed on the front passenger seat. DTC 5045 or B0074 OF may be set in the PPS module.

Affected vehicles include the following:

2009-2013 Buick Enclave

2012-2013 Buick LaCrosse

2013 Buick Regal

2009-2013 Cadillac CTS

2013 Cadillac XTS

2009-2010 Chevy Cobalt (except SS model)

2009-2011 Chevy HHR (except SS model)

2009-2013 Chevy Impala and Traverse

2010-2013 Chevy Equinox

2011-2013 Chevy Volt

2012-2013 Chevy Sonic

2013 Chevy Malibu

2009-2013 GMC Acadia

2010-2013 GMC Terrain

2009-2010 Saturn Outlook

NOTE: If DTC B0074 OF is set and the seat is wet, this bulletin does not apply. Refer to B0074 service procedure in the service manual for further diagnostics.

Some customers may comment about five slow chimes, with no obvious reason. If the customer checks the PPS display, they will notice that the passenger seat belt indicator is illuminated. Be aware that when certain conductive objects are placed on the front passenger seat, the front passenger airbag indicator may also illuminate. The seat belt reminder light/chime may also be activated.

Examples of objects that could enable the airbag include:

  • Computers or electronic tablets
  • Charging and audio cables
  • Cell phones
  • Tech 2
  • Large container of liquid
  • Groceries

An electronic device does not necessarily need to be turned on to cause this condition.

Because the vehicle is equipped with low-risk passenger airbags, the PPS is designed to turn the airbag on for most front seat occupants, and turn the airbag off for small children in child seats. The system works by detecting the capacitance of the object on the seat, not the object’s weight. The passenger seat belt reminder system is active when the passenger airbag is on.

Additionally, for some larger electronic devices, DTCs 5045 or B0074 OF may set in the PPS module depending on the vehicle. If you remove the electronic device from the front passenger seat, the DTC will go into history (if the DTC was set). If this happens, clear all SDM and PPS DTCs. If the PPS DTC is still current, follow the service procedure in the service manual for that DTC. If the DTC(s) does not return, no repair is needed.

NOTE: Never rest the diagnostic scan tool or components on the front passenger seat or tough the front passenger seat while the diagnostic scan tool is in contact with your body. This may cause the SIR lamp to illuminate while holding the scan tool, because your body can transfer the electronic noise to the sensor mat in the passenger front seat.

Advise the customer not to place electronic devices or conductive objects on the front passenger seat.

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