2005 Saturn Relay Voltage Drop

saturnisthebest · 07-23-2021, 07:29 PM

I have a 2005 Saturn Relay (3) reporting a B1516.

The battery, alternator, battery voltage sensor all have been replaced, and the terminals on the battery cable have been newly terminated with new terminals.
Service Engine Soon light still goes on, and when code is cleared, the voltage drops from 14.2 to 14.7 regular operating voltage, to around around 12.8 - 13.0 volts.

Clearing the code brings its back to regular voltage, until it fails the test exactly 2 minutes. New battery was tested and found good, as well as the alternator. I am at a loss and hoping its not the BCM. Any hints would be great.

02 LW300 · 06-29-2022, 11:23 AM

Does this vehicle idle with high electrical load for an extended length of time before the light comes on? Or is it random with no pattern?

07-23-2021, 07:29 PM	#1
saturnisthebest New Member Join Date: Jul 2021 Posts: 1	2005 Saturn Relay Voltage Drop I have a 2005 Saturn Relay (3) reporting a B1516. The battery, alternator, battery voltage sensor all have been replaced, and the terminals on the battery cable have been newly terminated with new terminals. Service Engine Soon light still goes on, and when code is cleared, the voltage drops from 14.2 to 14.7 regular operating voltage, to around around 12.8 - 13.0 volts. Clearing the code brings its back to regular voltage, until it fails the test exactly 2 minutes. New battery was tested and found good, as well as the alternator. I am at a loss and hoping its not the BCM. Any hints would be great.

06-29-2022, 11:23 AM	#2
02 LW300 Advanced Member Join Date: May 2015 Location: Willamette Valley, Oregon Posts: 933 02 LW300's Photos 2002 L-Series 3.0L Wagon 2002 L-Series 2.2L Sedan	Re: 2005 Saturn Relay Voltage Drop Does this vehicle idle with high electrical load for an extended length of time before the light comes on? Or is it random with no pattern? ... 2002 LW 300 loaded, just rolled 100,000 miles, new timing belt and goodies 2002 L200/5 Loaded, 280k grandson’s car 2000 LS1, TMU love those bcm failures., grand daughter’s car

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