I am in need of some help. Unfortunately I only have limited info though. I have a couple of customers that have told me that on Honda's when they use a memory saver through the OBD2 connector that the vehicles still lose all their memories. I was told the customer also tried the Cigarette lighter and OBD2 adaptor at the same time and still after disconnecting the battery it is lost. Any idea's?
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DSD -
After being burned a few times by a few different car lines i no longer use these devices and have resorted to more archaic and time-consuming methods. If you post the suspect Honda model, i would be happy to try to figure out why this is so.Comment
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honestly I don't remeber specifics. Try looking at a 96 accord and a 2001 accord. I believe the Civics are wired the same as far as how the power is distributed.
If I am not mistaken its because there is no active circuit for the Power to follow once the Key is in the off position. I believe the manufacture does this to prevent a drain from out side devices that may be pluged in.Comment
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hi those cars have fuse for back-up this fuse is number 47 ( 7.5 AMP ) is located under hood and make sure is in god condition because this fuse is for
STEREO RADIO TUNER ( 96-98 models ) AUDIO UNIT (99-00 models )
HEATHER CONTROL PANEL PCM,ECM,TCM ( 96-98 CVT ) .Comment
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Here's is what i have deduced:
The cig lighter is powered by a relay which is controlled by ign switch.
Same for acc power outlet.
The dlc has a power feed that appears to be able to feed(back) the whole system on this car. It does have to pass backwards through depicted "ELD unit". Schematic doesn't indicate any special symbol for this device and i don't know what this is yet. If the memory saver has a power out on its dlc pin #8 it looks like it would work. Question is, is the memory saver designed to feed power to pin 8 and what is in this "ELD unit".
Of course, there are many ways to accomplish this task. The more i look, the more i see. For example, a "tap" to power on a car's main or alt (usually 100amp) could easily feed the entire car. However, these are usually fastened into the box. I guess the point is we need a quick and safe way.
I don't actually have a good, standard, method for doing this yet. Would anyone like to share your ideas?Comment
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I would just like to thank you all for taking the time in responding. I am looking forward to someone finding a resolution. Thanks for your hellpDSDComment
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Hey Nick,
As member "snapon men" stated, these Hondas use the "back-up" fuse (the reverse lamps in rear, when transmission is in reverse) as the memory feed to the ECM. If you recall, the service manuals would have you remove this fuse to clear the ECM memory as a prefered method as opposed to disconecting the battery. This method keeps the radio from "locking" and the radio presets, the driver seat positions, etc. I have looked at a few Honda schematics, and power through the DLC is not enough, as the PCM draws power from other cicuits too. I have had success connecting a booster pack to the battery cable terminals, while disconnecting the actual battery (for battery replacement only). Of course one would need to take caution to not let the terminals touch. This method is good for pretty much any vehicle (have not tried on hybrids), and you don't lose any settings, readiness monitors, etc.
HTH, StaceyS. BrelandComment
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Hi Stacey. Looking at power distribution for a 2001, 4cyl, EX, it seems to me that pin 8 on dlc will indeed power the entire vehicle so long as it passes uninterrupted through the so called "ELD (electrical load detector)" unit which the schematic symbol suggests it does. Admittedly, i don't know what this unit consists of though. I suppose a quick "diode check" across it in the fuse box would indicate if power can indeed flow across it in both directions. A jumper over it could easily eliminate this liitle snag.
So, If either a DLC power saver that powers pin 8 is used or a jump pack to ground and positive to this terminal is used this car's circuits should remain in tact. What do ya think? I will check my power saver and report back.
NeilComment
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Hey Nick!
Here's what I got. I kept forgetting to check my memory saver tool, sorry. Today I remembered. It is an MSR memory saver with a DLC connector on one end and a cig adapter on the other. It has ground terminals on DLC terms 4 and 5 and 1 power term on DLC pin 16, thats it! Sooo, if I did my research right this tool will NOT work on the aforementioned Honda. If your tool is the same or similar, and it doesn't have a power term on pin 8, as I researched earlier, it too will not work.
In order to make a saver that will work, try a ground on pins 4 & 5, then put batt + on pin 8. Unfortunately, going forward, on cars where it matters, we may need to look at a schematic first and then devise a method to send batt + thru the DLC or otherwise. Pin # 8 is described as being "factory specific". So as far as a general procedure goes, it seems there isn't one. Cheers.
NeilComment
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Neil, your last post made me think of this: it has banna plug conectors, so one could send power or ground to the proper terminals. I know Snappy makes one, but this one looks better! Can be found here >
http://www.aeswave.com/products/Product.asp?i=711#AES LineSPI (SMART BOB)S. BrelandComment
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Ooooo, that looks great. I love when 1 tool can do multiple tasks. That's the memory saver I SHOULD have bought. Those DLC memory savers like I posted (I have) are useless. Nice idea!
NeilComment
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Neil,
If you did take a look at the website, then you read the real reason for its creation, to help diag the data bus lines, power and ground pins, etc. I have kinda wanted this jem from time to time, but just have not put it in the "shopping cart". What I think is the neatest is that you can have your scanner connected at the same time, so it is "passive", and scope the bus for the data stream(s). Hence the name "Line Spi".
Sorry Nick for the hijack.
StaceyS. BrelandComment
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