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  #1  
Old 07-26-2010, 06:05 PM
Dcrymes99ranger Dcrymes99ranger is offline
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Default Installing a battery on 2000 and newer cars

I have a question. I change batteries at work. And the 1999 cars and newer we have to plug up the jump box to the obdll port before we take the negative side cable off the battery. Now I forget to do so on a crap load of them. The reason I am posting this is because the computers in the 2000 model cars not just Rangers, have codes in them. And supposedly if you don't hook the jump box up before you remove the negative cable, you can erase the codes and the vehicle won't start. Now I haven't had any vehicles do this to me yet. (Knock on wood). Well I changed the battery yesterday and I forgot to plug the jump box up to the obdll port and it started. It was a 03 Plymouth van voyager I think. Any imput on this topic. Anyone ever run into this situation?
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  #2  
Old 07-26-2010, 06:07 PM
ranger101 ranger101 is offline
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Default Re: Installing a battery on 2000 and newer cars

I'm calling bullshit. I've disconnected the battery from my Ranger sooo many times with all of my stereo shit I've done and I've NEVER had this problem.
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Old 07-26-2010, 06:08 PM
Dcrymes99ranger Dcrymes99ranger is offline
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Default Re: Installing a battery on 2000 and newer cars

Quote:
Originally Posted by ranger101 View Post
I'm calling bullshit. I've disconnected the battery from my Ranger sooo many times with all of my stereo shit I've done and I've NEVER had this problem.
Thats what I don't understand. They say it's for insurance purposes.
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  #4  
Old 07-26-2010, 06:09 PM
STL STL is offline
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Default Re: Installing a battery on 2000 and newer cars

Never heard that before.
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Old 07-26-2010, 06:51 PM
FireRanger FireRanger is offline
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Default Re: Installing a battery on 2000 and newer cars

That is an absolutely load of BS and is not at all true.

When you drop power to the ECU for more than X seconds, it will lose it's volatile memory, which is where most trouble codes are stored and where it retains what it learns about how you drive and engine tuning type stuff (over simplified). It will not lose anything required for the vehicle to start.

Hooking up power though the OBD-II port is probably a very very bad idea actually. Backfeeding power through a circuit that isn't designed to have power applied through it is asking for trouble.
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  #6  
Old 07-26-2010, 07:04 PM
Scottg Scottg is offline
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Default Re: Installing a battery on 2000 and newer cars

i'll have to look up at work tomorrow, but there some high end cars that will fry of the pcm if you don't. But I doubt those people take their car to advance
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Old 07-26-2010, 07:06 PM
SPless SPless is offline
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Default Re: Installing a battery on 2000 and newer cars

Actually, I have heard of a few cases of this happening through my dad's shop before. The one that stands out is a volvo. And if it's a bad idea then why do the companies that manufacture the jumpboxes make the extension?
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Old 07-26-2010, 07:41 PM
sgtsandman sgtsandman is offline
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Default Re: Installing a battery on 2000 and newer cars

I've disconnected the battery on my 2001 CR-V with no problems. ever. As a matter of fact, it as well as my current vehicles all have quick disconnects on the negative terminal so I don't have to use a wrench to do it. Never had a problem.
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  #9  
Old 07-26-2010, 07:49 PM
edgeman4.0 edgeman4.0 is offline
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Default Re: Installing a battery on 2000 and newer cars

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  #10  
Old 07-29-2010, 02:34 PM
Scottg Scottg is offline
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Default Re: Installing a battery on 2000 and newer cars

tsb out on lexus

ELECTRICAL
EL016-06

Title:
VEHICLE START AFTER
BATTERY DEPLETION

Models:
'06 GS 300, '06 - '07 GS 430,15 250/350, & '07 ES 350, GS 350, & LS 460

December 22, 2006

Introduction

In vehicles equipped with the Smart Key system, the starting function may not be operational after recharging a discharged battery or jump starting the vehicle. If battery voltage drops below 9V, the Steering Lock ECU may need to be re-initialized. Follow the initialization procedure below to re-initialize the Steering Lock ECU.

Applicable Vehicles

^ 2006 model year GS 300 vehicles.

^ 2006 - 2007 model year GS 430, IS 250, and IS 350 vehicles.

^ 2007 model year ES 350, GS 350, and LS 460 vehicles.
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  #11  
Old 07-29-2010, 02:57 PM
rangerhippie rangerhippie is offline
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Default Re: Installing a battery on 2000 and newer cars

some very high end cars have this but most don't be wary of cars with chip/smart keys i now that some of these systems can be reset so the car will not start with the chip/smart key and you'll have to reprogram the key.
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  #12  
Old 07-29-2010, 03:20 PM
99offroadrngr 99offroadrngr is offline
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Default Re: Installing a battery on 2000 and newer cars

Yeah those ones with the smart keys have that as "theft protection" which is stupid in my opinion because if a tech accidently does this working on a vehicle then the key would have to be reprogrammed. Whole lotta BS on those systems
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