AlfaOBD

[Ghost_RAM]

I heard that alfa can edit the total mileage displayed on the dashboard?

Alfa cannot change the mileage on the odometer.


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[oldjoe]

I heard that alfa can edit the total mileage displayed on the dashboard?

You mean like miles to Km?

 

[fengfengfeng]

Guys, it’s time to get up.

 

[fengfengfeng]

[QUOTE =“oldjoe，帖子：1894588，会员：73789”]你的意思是公里到公里？[/引用]
ghostRAM know what i mean

 

[Rob_K]

Hi guys,

Does anyone actually know what changing a light to LED does?

I've read people have removed resistors and Canbus adapters and such but does it just disable bulb out warnings or does it change the PWM frequency providing a more stable voltage so an LED can operate unimpeded.

The same goes for the HID setting?

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[Fremen]

Looking for information about the blue inline adapter.
Is this so it can change from one BUS to another?

I thought the OBDLink MX Bluetooth could read both already?

 

[Ghost_RAM]

Looking for information about the blue inline adapter.
Is this so it can change from one BUS to another?

I thought the OBDLink MX Bluetooth could read both already?

If you have the OBDLink Bluetooth MX, you’re good to go for everything Alfa has to offer.

OBDLink MX, LX and SX. OBDLink MX is the recommended interface for the cars with high-speed CAN bus on pins 6 and 14 and the middle-speed CAN bus on the pins 3 and 11 of the OBD plug. These are most of the Chrysler/Dodge/Ram/Jeep cars, PowerNet and CUSW-based, Fiat Tipo/Egea. No additional adapters are needed for these cars when using OBDLink MX. Note: Fiat 500X/Jeep Renegade and Compass (MP) require the "grey" adapter for the access to the second high-speed CAN bus.
LX and SX interfaces additionally require "blue" adapter for access to the middle-speed CAN bus.
OBDLink also recommended for the Fiat/Alfa Romeo/Lancia CAN-based cars. The "yellow" adapter might be needed for access to the low-speed CAN bus.
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[Ghost_RAM]

Hi guys,

Does anyone actually know what changing a light to LED does?

I've read people have removed resistors and Canbus adapters and such but does it just disable bulb out warnings or does it change the PWM frequency providing a more stable voltage so an LED can operate unimpeded.

The same goes for the HID setting?

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I'd be curious to know this as well but it would definitely take someone with the know how and an oscilloscope (I would assume) to be able to properly determine this. Unless someone knows anyone in the FCA who can provide the answer.

 

[chrisbh17]

I'd be curious to know this as well but it would definitely take someone with the know how and an oscilloscope (I would assume) to be able to properly determine this. Unless someone knows anyone in the FCA who can provide the answer.

I have the same curiosity.

If we try deduction...resistors are added to add more current draw, correct? That will fool the computer into thinking its drawing enough current to keep a "bulb out" light from showing. So in that case the LED setting in alpha may just ignore the current. Or it might set it to a lower value, not sure.

Now...exactly what do CANBus adapters do? That I do not know. Resistors are easy to explain (because they are easy parts!) but can anyone explain exactly what a CANBus adapter does? Is it somehow creating a PWM signal to go to LEDs? if so, if the Alfa setting lets you eliminate the adapters too, then the BCM must be doing something other than just ignoring the bulb out indicator at that point.

 

[lpennock]

I hate having to be patient, lol.

Patience is a virtual I don't have time for.


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[Ghost_RAM]

Now...exactly what do CANBus adapters do? That I do not know. Resistors are easy to explain (because they are easy parts!) but can anyone explain exactly what a CANBus adapter does? Is it somehow creating a PWM signal to go to LEDs? if so, if the Alfa setting lets you eliminate the adapters too, then the BCM must be doing something other than just ignoring the bulb out indicator at that point.

I believe they simply provide the corrected connections or reroute to align the pins. So if you have the LX or SX and need to connect to the high speed CAN BUS then the blue adapter makes it so you can.


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[chrisbh17]

I believe they simply provide the corrected connections or reroute to align the pins. So if you have the LX or SX and need to connect to the high speed CAN BUS then the blue adapter makes it so you can.


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hehe I was referring to CANBus adapters for LED bulbs

 

[kad]

Yeah, I can find the connectors all day long, but I can’t find anything on the terminals. The numbers chrisbh 17 posted are the numbers they have on their drawings, but when I search them, nothing comes up.

Ok, several telephone calls and careful examination of a technical drawing later, the conclusion appears to be that the available terminals are Kostal terminals. The smaller one is the MLK 1.2 series, the larger one is the SLK 2.8 series. I don't have 100% confirmation on that yet, that will take a day or three for my requests to work their way through the system, but the measurements diagram for the connector specifies cavity dimensions and maximum cable cross sections for MLK 1.2 and SLK 2.8.

https://www.mouser.com/catalog/additional/DelphiConnectionSystems_13673600.pdf


Mouser stocks both types. Arrow, Jameco, Digikey & Terminal Supply do not appear to. I also see them on eBay, they appear to be common on BMWs.

-K

 

[Redheadhunter21]

I have the same curiosity.

If we try deduction...resistors are added to add more current draw, correct? That will fool the computer into thinking its drawing enough current to keep a "bulb out" light from showing. So in that case the LED setting in alpha may just ignore the current. Or it might set it to a lower value, not sure.

Now...exactly what do CANBus adapters do? That I do not know. Resistors are easy to explain (because they are easy parts!) but can anyone explain exactly what a CANBus adapter does? Is it somehow creating a PWM signal to go to LEDs? if so, if the Alfa setting lets you eliminate the adapters too, then the BCM must be doing something other than just ignoring the bulb out indicator at that point.

https://www.ramtrucks.com/ram-commercial/body-builders-guide.html

Here's a link for the body builder guide for the Cab & chassis trucks, I would think its a similar setup on all the vehicles just don't have the same options to bypass on the the 1500 or 2500 trucks.

Not having a can bus adaptor to pull apart I would think its just essentially a resistor adding enough load to make the truck happy

 

[Ghost_RAM]

hehe I was referring to CANBus adapters for LED bulbs

Sometimes when doing other things I tend to rush though while reading. Not a multitask kinda guy.. Lol

 

[likes2build]

Sometimes when doing other things I tend to rush though while reading. Not a multitask kinda guy.. Lol

LOL, could that be because you started the largest thread here on the RAMForum and help us all? Sometimes I go away for the day and come back to see a dozen or so new pages.

Thanks GHOST

 

[alpinegreenneon]

The CAN bus network uses different resistances in two wire circuits for multitasking. Technically it's called multiplexing, enabling the transmission of multiple messages with modules over a single channel or circuit. A bulb and a diode (LED = light emitting diode) have very different resistances. Adding a resistor to a LED makes the BCM think it's still a bulb. Using alfaOBD changes the resistance that the BCM expects, thus eliminating the need for an extra resistor in the circuit.

 

[Rob_K]

The CAN bus network uses different resistances in two wire circuits for multitasking. Technically it's called multiplexing, enabling the transmission of multiple messages with modules over a single channel or circuit. A bulb and a diode (LED = light emitting diode) have very different resistances. Adding a resistor to a LED makes the BCM think it's still a bulb. Using alfaOBD changes the resistance that the BCM expects, thus eliminating the need for an extra resistor in the circuit.

Makes sense as I just changed my fogs to LED enable and the bulbs are now out. I still have halogens in. But no bulb out warning and the indicator shows they are still on.

Changed it back and they came back on.

Just testing as I'm installing some DDM Saber LEDs into the fogs this weekend and am leaving out the resistors.

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[Zee ahmed]

The CAN bus network uses different resistances in two wire circuits for multitasking. Technically it's called multiplexing, enabling the transmission of multiple messages with modules over a single channel or circuit. A bulb and a diode (LED = light emitting diode) have very different resistances. Adding a resistor to a LED makes the BCM think it's still a bulb. Using alfaOBD changes the resistance that the BCM expects, thus eliminating the need for an extra resistor in the circuit.

If I remember right on the newer models the can bus will very quickly flash the light lights and the check the draw on the circuit. Leds and hids will break the circuit instantly to where the halogen will slowly come down that's why in the newer trucks you can't just use a resistor to show load, i believe they use capacitors to ground to mimic a halogen. I could be wrong about all this but when I first got my truck they were still trying to figure out how to add hids to the 2015+ because the old method of using resistors didn't work any more.

 

[Rob_K]

If I remember right on the newer models the can bus will very quickly flash the light lights and the check the draw on the circuit. Leds and hids will break the circuit instantly to where the halogen will slowly come down that's why in the newer trucks you can't just use a resistor to show load, i believe they use capacitors to ground to mimic a halogen. I could be wrong about all this but when I first got my truck they were still trying to figure out how to add hids to the 2015+ because the old method of using resistors didn't work any more.

Actually you are right. When I turned on the fogs after changing alpha, the fogs came on for half a second and went off until I changed it back.

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