Has anyone ever found the secondary battery in their Crossfire?

 

Crumpys SRT is showing "No Vin" and won't start. Perhaps this is related.

Her car is also locked up over the week end but I will look into this Monday as well.

Thanks Lantana.

So, you have to remove the dash to get to the Skreem?

roadster with a stick

 

OK I'll bite. The only secondary battery I found was in the panic button system. It allows the horn to operate even power is cut off.

Your turn, Is there another one?

 

Where did you find it? If you are talking about the one in the key, that is not it. but if you are talking about the one in the car, that is what we are trying to locate. It should look something like a small rechargable jet ski battery. It allow the siren to keep on screaming even if you disconect the main battery.

 

You have to remove the guage cluster which isn't a lot of fun. There is a picture from the service manual on the V8 thread on the second to last page.

 

You would think it'd be found in the owner's manual..

 

I didn't look at the owners manual but the service manual mentions it but but does not clearly tell you where it is. We also can't find it in the wiring diagrams which leads us to suspect it is in the siren.

 

I wonder if you call the dealer's trained Crossfire tech, if he would tell you?

 

I thought is was worth a shot to see if anyone has come accross this battery. I bet HDDP found it when he went to a stand alone system for his race car, but he doesn't seem to be active anymore.

 

OK It is located in the siren which is about mid-point on the back fire wall. It does not need to be replaced. It is self charging.

 

Thank you! I am not looking to replace it. I want to remove all power to see if it will clear a fault in the SKREEM anti-theft module. This seemed to work for "Superstar" in his SKREEM NO MORE thread. I know I can clear it with DRBIII but I don't have access to one and the only option to get one seems to be to rent one. I believe I activated the immobilization when I first started to code my V8 ECU to my car. The ECU is now correctly coded to the car and everything seems to be working properly with no fault codes but the only module I haven't been able to access in the MB STAR Diagnostic system is the anti-theft module.

 

There is no ONE module that works the alarm system. Use the search for "panic alarm". I gave a pretty accurate explanation of ALL the modules involved. It really is a difficult system to deal with. Do you have access to a repair manual?

Be prepared the siren will go off when you disconnect it. That is the reason for the secondary battery. I'd say do it outside the garage or wear ear protection. That noise is worse then the seat belt when it comes to annoying. It is really loud in the garage.

 

Sorry just reread your post, did you have a DRB III when you worked on the ECU? It is my understanding that once a computer switch is set you need to program it with a DRB III. Loss of power will not set the switch to the default when the car was built. For example, in Europe the default is NO panic button. Their keys do not have a panic button.

Please post if you are successsful. Good luck.

 

Thanks for the warning on disconnecting it. I have the service manuals for the Crossfire as well as the all the service information for the very similar SLK320 R170 in my MB Star Diagnostic system. I have been able to see that the security system has its wires in everything. We have been able to check and read all the modules except the anti-theft module. the reason we can't read it with the MB system is that while it does have a MB part number it is unique to the Crossfire so the MB system doesn recognize the version. I probably need a DRBIII as I am pretty sure that I tripped the system when I first attempted to program the unlocked ECU to the Crossfire for my V8 conversion. Once all coding was done in the ECU (we had to use developer mode and do custom varient coding) you have to run "drive authorization" for the ECU for it to learn its anti-theft coding. This went very smoothly and completed just fine but still no cranking. This is likley caused by a stored fault in the SKREEM module which again is the only module we cannot read in DAS. All other modules are working fine with no fault codes at all. If I cannot find a DRBII with the special Crossfire PCMI card and multiplexer cable I was hoping I could clear the the SKREEM by removing all power from it. This seemed to work in the SKREEM no more thread, except he cleared it by unplugging the SCREEM. If this would work, discconecting the primary and secondary battery should accomplish the same thing and is much easier than removing the gauge cluster to get to the SKREEM.

Edit: Just a quick note on DRBIII... I am not impressed! It seems very limited and cumbersome compared to the MB STAR DAS system. The DRBIII for a Crossfire or Sprinter requires special PCMI cards and special cables and muti-plexer. The system looks like a band aid to allow Chrysler to work on Crossfires and Sprnters that really are Mercedes through and through. The MB STAR system has a semi-secrect version called developer mode which requires a special key (I have) that allows you to do just about anything you want. The only problem is that it is all in German as it is used by the engineers to develop new models and prototyes.

 

Franc. The SKEEM is a self learning module. It gets the VIN from the closed loop electrical bus. Do you have access to a manual?

 

Here is the link to the manual. You can save it to your computer after it loads.

http://www.majormotorshotrods.com/_d...ice_Manual.pdf

 

Quote: Just a quick note on DRBIII... I am not impressed! It seems very limited and cumbersome compared to the MB STAR DAS system. The DRBIII for a Crossfire or Sprinter requires special PCMI cards and special cables and muti-plexer. The system looks like a band aid to allow Chrysler to work on Crossfires and Sprnters that really are Mercedes through and through. The MB STAR system has a semi-secrect version called developer mode which requires a special key (I have) that allows you to do just about anything you want. The only problem is that it is all in German as it is used by the engineers to develop new models and prototyes

You hit the nail on the head. That is all it is. In addition Chrysler has not updated their part of the software so in many ways it is like fighting blind.

 

OPERATION

The Sentry Key Remote Entry Module (SKREEM) has the following functions: receiving and evaluating the Radio
Frequency (RF) keyless entry remote signal, actuation of door locks in conjunction with the Central Locking Pump/
Security System Module, and enabling the vehicle theft security alarm with confirmation via the turn signals. When
the RKE transmitter is operated, an RF signal is transmitted. If the SKREEM recognizes the RF signal as valid, it
actuates the Central Locking Pump/Security System Module through the Body Control Module. The vehicle is then
locked or unlocked through the power locks system. Connected to the SKREEM is a Sentry Key Antenna Ring
which surrounds the ignition lock cylinder. When the ignition is switched on, the Sentry Key Antenna Ring is supplied
with power. A data block is transmitted inductively via the Sentry Key Antenna Ring to the SKREEM and then
on to the Powertrain Control Module. If the antenna ring data block content is invalid or if vehicle battery power is
too low to build up enough power for the antenna ring, the Powertrain Control Module will not receive the proper
signal. This is displayed with the message “Start Error” in the Instrument Cluster.
The SKREEM contains an RF transceiver and a microprocessor. The SKREEM transmits RF signals to and receives
RF signals from the ignition key transponder through a tuned Sentry Key Antenna Ring that is wired to the
SKREEM. If the Sentry Key Antenna Ring is not mounted properly around the ignition lock cylinder housing, communication
problems between the SKREEM and the ignition key may arise. These communication problems will
result in ignition key transponder-related faults. The SKREEM also communicates over the Controller Area Network
(CAN) data bus with the Powertrain Control Module (PCM), the Instrument Cluster, the Body Control Module (BCM),
and/or the DRB III

Refer to the appropriate diagnostic information.

It appears as though the skreem module does keep the key code, and sends it on when detected. I would guess it is a flash memory.
It may be that as in the skreem no more thread, the skreem can be re-intitialized, by complete powering down. Though I am not sure if the alarm backup battery has anything to do with it.

 

Not in hand but, Shark067 has one. I'll get it this week end.

franc

 

Franc, scroll up a little. I posted the link to the manual.