dassaur
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So I have been meaning to tackle this issue for a while and got some time today. I have been running DTC B1517 5A (battery voltage plausibility) for who knows how long. I have noticed no symptoms except the existence of the code. For context I acquired the car in Feb 2020. The battery is definitely good, it's a year old and for completeness I got it tested a few weeks ago and also fully charged it overnight.
The first thing I did was check every BCM fuse in all fuse boxes and they were all good.
I hooked up the scan tool and the voltage at the battery posts themselves, under the hood and via the scan tool were all reading identically.
I then thought to take the battery out and have a ferret around. I removed the entire battery cradle assembly and there was a slight bit of corrosion on the battery cradle. Cleaned and resprayed all good. There were no loose cables, fusible links were all good and all grounds looked fine after a visual inspection and checking for tightness.
I then noticed a loose wire which looks like it has been broken off a c-clip type terminal on the negative battery side. Picture below:
So I fixed it all up, put the scan tool back on and oh boy. DTCs left right and centre - EXCEPT the original DTC!!!
B147E 04 Battery Saver Relay Set Secondary Circuit Open
B3811 01 Rear Washer Relay Circuit Short to Battery
B3811 04 Rear Washer Relay Circuit Open
B3873 01 Front Washer Relay Circuit Short to Battery
B3873 04 Front Washer Relay Circuit Open
B3883 01 License Plate Lamp Circuit Short to Battery
B3883 04 License Plate Lamp Circuit Open
B1325 03 Control Module Power Circuit Low Voltage
And for some reason, I can't open the liftgate either via the traditional method.
I ran out of light so tomorrow's job is to remove that ground and see what happens. But in the interim I thought I'd ask if anyone had any ideas.
Can anyone check their car to see what's going on with the cable. It's the one with the insulation around it as per below pic.
It looks potentially related to tow wiring but can't be sure. While we're at it, that taped up connector - anyone else got it?
Thanks !!!
The first thing I did was check every BCM fuse in all fuse boxes and they were all good.
I hooked up the scan tool and the voltage at the battery posts themselves, under the hood and via the scan tool were all reading identically.
I then thought to take the battery out and have a ferret around. I removed the entire battery cradle assembly and there was a slight bit of corrosion on the battery cradle. Cleaned and resprayed all good. There were no loose cables, fusible links were all good and all grounds looked fine after a visual inspection and checking for tightness.
I then noticed a loose wire which looks like it has been broken off a c-clip type terminal on the negative battery side. Picture below:
So I fixed it all up, put the scan tool back on and oh boy. DTCs left right and centre - EXCEPT the original DTC!!!
B147E 04 Battery Saver Relay Set Secondary Circuit Open
B3811 01 Rear Washer Relay Circuit Short to Battery
B3811 04 Rear Washer Relay Circuit Open
B3873 01 Front Washer Relay Circuit Short to Battery
B3873 04 Front Washer Relay Circuit Open
B3883 01 License Plate Lamp Circuit Short to Battery
B3883 04 License Plate Lamp Circuit Open
B1325 03 Control Module Power Circuit Low Voltage
And for some reason, I can't open the liftgate either via the traditional method.
I ran out of light so tomorrow's job is to remove that ground and see what happens. But in the interim I thought I'd ask if anyone had any ideas.
Can anyone check their car to see what's going on with the cable. It's the one with the insulation around it as per below pic.
It looks potentially related to tow wiring but can't be sure. While we're at it, that taped up connector - anyone else got it?
Thanks !!!