Technical The Consequences of Low Voltage....

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Technical The Consequences of Low Voltage....

Was the bulb actually blown?

I would suspect a wiring issue.. not a control issue

(Check the hatch wiring )

Yep, the original brake bulbs are kinda quirky oddball units (tooth-type rather than screw type) and I actually replaced the right bulb about 6 months before the left one blew, and the hatch wiring seems fine on all fronts (the bulb socket registers current with a tester screwdriver, but I haven't held a proper voltmeter to it to see if there are any undue fluctuations).

Herts Hillhopper said:
My 4x4, the ELD light in the dash doesn’t illuminate if I press the button. I don’t think it’s supposed to. I do get the ‘connected’ message and the light in the button itself is on. The dash light should only illuminate if the ELD actually kicks in - and then should only show during the (usually brief) time that actually happens (see pages from the owner manual below). The ELD light is green. The light does not illuminate if 4x4 is active (with or without the button pressed) and engages but without needing the ELD as well. In other words, there is no indication on the dash that 4 wheel drive (but not the ELD) has been engaged.

This might be a pre-Cross oddity (I have an early 2012 4x4), as the way it has always worked up until now has been pressing the button (green led on button turns on) with the dash display writing "ELD Connected" and the green ELD light illuminating at a fixed state. The ELD light then flashed when it was actually doing something in slippy stuff, and would turn off above 50kph (though the button would still be pressed and the led on the button would still be on). Back when the rear brake pads had worn down, I got the "ELD Unavailable" warning and a yellow ELD icon on the dash. Maybe it was wonky then, maybe it's wonky now. At this moment though, I've got bigger issues, such as the -30C temperatures gelling the diesel, causing a whining fuel pump, and despite the brand new battery, cold starts are immensely clunky (despite the heater coil light staying on for a few seconds I suppose it's not enough to de-gel the fuel).
 
I'll add an anecdote to this thread, and will update it if I can get the issue resolved. Essentially, my battery ran flat (it was quite old), and needed a jump to the nearest service. Just a day before the battery issue, the rear left brake light had gone bust so I already had a warning triangle on the dash. After a battery replacement, the good folks at the dealer attempted to swap the brake bulb as a courtesy but upon exiting the garage it went out again immediately. This, of course, would require further diagnostics for which I didn't have time. Since then, the other big issue I have found is that engaging the ELD lights up the led on the button and the dash reads out "ELD Connected" but the little green ELD light in the dash doesn't illuminate. It's sort of working, as it is sending power to the rear wheels when the fronts slip on snow, but not as smoothly as it used to (jerky and abrupt), and usually engaging the differential disables ESC and traction control, but I'm getting those lights flashing up even with ELD on, and not a peep from the ELD light in either green or yellow. I have a sinking feeling this is going to come down to a new ECU or body computer, but I have yet to take the poor thing back to the dealer as I live out in the sticks and have no other transportation for the moment.
Double check they fittedthe correct bulb
 
Yep, the original brake bulbs are kinda quirky oddball units (tooth-type rather than screw type) and I actually replaced the right bulb about 6 months before the left one blew, and the hatch wiring seems fine on all fronts (the bulb socket registers current with a tester screwdriver, but I haven't held a proper voltmeter to it to see if there are any undue fluctuations).

This might be a pre-Cross oddity (I have an early 2012 4x4), as the way it has always worked up until now has been pressing the button (green led on button turns on) with the dash display writing "ELD Connected" and the green ELD light illuminating at a fixed state. The ELD light then flashed when it was actually doing something in slippy stuff, and would turn off above 50kph (though the button would still be pressed and the led on the button would still be on). Back when the rear brake pads had worn down, I got the "ELD Unavailable" warning and a yellow ELD icon on the dash. Maybe it was wonky then, maybe it's wonky now. At this moment though, I've got bigger issues, such as the -30C temperatures gelling the diesel, causing a whining fuel pump, and despite the brand new battery, cold starts are immensely clunky (despite the heater coil light staying on for a few seconds I suppose it's not enough to de-gel the fuel).

Yeah - not that cold here!

But my three MJ 4x4s (2023, 2017 and 2018 models) have all worked the same way: press ELD, button lights up, dash says ‘ELD Connected’, and no light on dash unless the ELD needs to lock a wheel.

The yellow ESC light can (and does) flash if 4x4/ELD is not on, but it should not operate (and so not show yellow ESC) if ELD is engaged.
 
Yeah - not that cold here!

But my three MJ 4x4s (2023, 2017 and 2018 models) have all worked the same way: press ELD, button lights up, dash says ‘ELD Connected’, and no light on dash unless the ELD needs to lock a wheel.

The yellow ESC light can (and does) flash if 4x4/ELD is not on, but it should not operate (and so not show yellow ESC) if ELD is engaged.

How did you get hold of a 2023 model?
Just askin':confused:
 
But my three MJ 4x4s (2023, 2017 and 2018 models) have all worked the same way: press ELD, button lights up, dash says ‘ELD Connected’, and no light on dash unless the ELD needs to lock a wheel. The yellow ESC light can (and does) flash if 4x4/ELD is not on, but it should not operate (and so not show yellow ESC) if ELD is engaged.

Can confirm my 2020 TA 4x4 operates in exactly the same way.
 
Yeah - not that cold here!

But my three MJ 4x4s (2023, 2017 and 2018 models) have all worked the same way: press ELD, button lights up, dash says ‘ELD Connected’, and no light on dash unless the ELD needs to lock a wheel.

The yellow ESC light can (and does) flash if 4x4/ELD is not on, but it should not operate (and so not show yellow ESC) if ELD is engaged.

This merely confirms my earlier statement that something's wonky, as any attempts at doing snownuts (snow donuts) in a field with supposedly "ELD Connected" results in the ESC and TC lights flashing, the ECU throwing a fit and cutting power resulting in what I like to call the "chameleon walk" (they do this odd routine in an attempt to look like a leaf blowing back and forth but just seem absolutely undecisive about taking the next step, rocking back and forth and not really getting anywhere). Basically even if I mash the gas in first on a frozen surface, I get a brief moment of power, then a kick in the pants as power goes to the rear wheels (after the fronts spin briefly under power), then jerky back and forth like an on/off switch as all the electronic nannies blink furiously as if to dazzle me out of my uncooth demeanor while I jankily understeer into a ditch. I was told by an outside observer that it looked as if either I or the car were having an epileptic seizure.

At least the weather is getting better so the fuel pump probably won't disintegrate trying to move diesel turned to toothpaste to the engine, which itself - in the mornings at least - sounds like what I imagine Terminators having quite aggressive yet lopsided intercourse would sound like if they did such things.
 
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