C70 RDAR battery drain step by step - Volvo Forums - Volvo Enthusiasts Forum

Go Back  Volvo Forums - Volvo Enthusiasts Forum > Volvo Vehicles > Volvo C70
Reload this Page >

C70 RDAR battery drain step by step

Volvo C70 This sporty coupe has a three-piece retractable hardtop for unsurpassed fun whether the the top is up or down.

C70 RDAR battery drain step by step

  #1  
Old 11-08-2017, 09:35 AM
Junior Member
Thread Starter
Join Date: Oct 2013
Posts: 6
Default C70 RDAR battery drain step by step

Hi all. I recently ran into the dreaded satellite battery drain issue. I dug around through multiple posts on multiple forums to get the 8nfo I needed and thought I’d post a step by step to consolidate the info.

Problem - Battery would drain in 3-5 days if not used.

1. Verify drain. Hook up an ammeter on the 10amp range in line on the negative side of the battery. You will see an initial current of around three amps as systems wake up. This will settle down to about .5 amp. (Which is way too high)

2. Isolate the satellite/ RDAR circuit. On he 2009 C70, pull fuse F16 in the engine bay. Current should drop to zero. (It’s not actually zero but it’s low enough that the 10amp scale doesn’t show it)

3. Reinstall F16, disconnect the meter and in the interior fuse box, pull fuse F64. F64 feeds the RDAR unit and the lock indicators. Econ next the meter to the battery. You will get the initial current of three amps or so. This will drop down to zero after 30 seconds or so.

***IMPORTANT - be sure to disconnect the meter if you open either door. When you open the door, current will jump to about 3-4amps from the dome lights and will drop as they dim and go off. BUT, opening the door apparently wakes up some systems that draw around .6 amp and they do not go back to sleep for 30-40 minuets! This can cause you to chase gremlins that are not there.

4. You have now verified the problem. Now for the fix. You have two choices: get the software upgrade from the dealer. If your car is out of warranty, this reportedly costs upwards of $150. (Side note - there is an class action against Volvo currently in the courts because of this)

The second choice is to disconnect the RDAR unit. In my car, it’s in the trunk, passenger side. You have to loosen the trunk liner to get to it but it’s just a couple clips. No tools needed. The power connector is the lower one at the rear of the unit. Pulling the power will remove the battery drain but now you will have no radio.

The audio system has a fiber optic data loop that will disable the radio if the circuit is not complete. The work around for this is to get a MOST loop. This is essentially a connector that loops the fiber back on itself. You can get one on amazon or eBay. Get the female connector, i paid $14.99 on amazon prime. The data loop is the connector with two orange wires on the rear of the unit. Unplug and then connect the loop.

Double check that the draw is gone and button things up.

Realistically, if you have the MOST loop, you should be able to finish everything in under an hour.

Hope this helps.
 

Last edited by Mark_bert; 06-01-2018 at 07:42 AM.
  #2  
Old 05-31-2018, 09:20 PM
Junior Member
Join Date: May 2018
Posts: 1
Default

I have a 2009 Volvo C70 convertible hard top. My trunk liner is screwed down in several locations with what appears to be T40 screws. Before I go messing around I want to make sure your car with the RDAR unit on the driver side is the same as mine. I wish I had a picture of the location of unit. Is the unit in the floor of the trunk or in a side panel? Is it closer to rear or front of the truck area?
 
  #3  
Old 06-01-2018, 03:53 AM
Junior Member
Join Date: Jul 2017
Location: C-11,OKHLA VIHAR, JAMIA NAGAR, NEW DELHI-110025
Posts: 1
Default

Same here, I have a 2011 Volvo C70, and has had a battery drain problem, replaced the battery once .This is silly, step up to the plate Volvo.
 
  #4  
Old 06-01-2018, 07:41 AM
Junior Member
Thread Starter
Join Date: Oct 2013
Posts: 6
Default

Originally Posted by AThayer View Post
I have a 2009 Volvo C70 convertible hard top. My trunk liner is screwed down in several locations with what appears to be T40 screws. Before I go messing around I want to make sure your car with the RDAR unit on the driver side is the same as mine. I wish I had a picture of the location of unit. Is the unit in the floor of the trunk or in a side panel? Is it closer to rear or front of the truck area?
Having reread my original post, I see that I am in fact an idiot. The unit is on the passenger side. I have no idea why I wrote driver side. I’m going to update the post.

Sorry for the confusion.
 
  #5  
Old 07-17-2018, 01:47 PM
Junior Member
Join Date: Jul 2018
Posts: 2
Default

This thread is really helpful thank you. I just wondered Mark/AThayer if you had success with this after locating the module. I have had similar issue with battery drain, which could be caused by the same problem. I think I've located the module but it looks more like an amplifier - certainly a google search on the part number points to that. Could I check I am looking at the same thing as you? Power cable, optical cable and a cable loom - green connector - could be audio cables? Disconnecting the unit stops the audio system as mentioned earlier in the thread. I will get a MOST loop - but it just looks like the unit is still required if it is the amplifier I am looking at. Further to this there is another unit in the same place on the other side of the car but there doesn't appear to be any optical cable connected to this unit.

Any comments on your experience would be very much appreciated. I'm UK based so RHD!
 
Attached Thumbnails C70 RDAR battery drain step by step-img_2776.jpg   C70 RDAR battery drain step by step-img_2778.jpg   C70 RDAR battery drain step by step-img_2781.jpg  
  #6  
Old 07-18-2018, 06:31 AM
Junior Member
Thread Starter
Join Date: Oct 2013
Posts: 6
Default

Edstoker -that looks pretty much like what I remember. Since I disconnected it and used the MOST loop, I have had no more issues with the battery. The car has been left for as long as nine days and it fired right up.
 
  #7  
Old 07-25-2018, 08:25 PM
Junior Member
Join Date: Jul 2018
Posts: 1
Default

I'm posting this to hopefully save a lot of time and frustration. (...like me!)

- The EXACT location of the RDAR unit on the C70 is just forward of the passenger tail light, mounted on the side of the rear fender, below the antenna.
- To access, pull off the inside cover for the tail light assembly (squeeze cloth together top and bottom), then remove the plastic clips along the top of the side panel. The small, square clips pinch together from top to bottom to pop out. Any other attempt will break the clips (fragile).
- Peel the top of the panel out from underneath the upper weatherstripping and pull back. You'll need to bend the panel a bit but it pops right back into shape.
- Then, look down along the side of the car between the fender and the peeled back liner (I looked over from the side, rather than the back. Easier to see down the gap.) for the 2 orange wires (actually fiber optic cables) that plug into the back of the metal unit. They may be wrapped in crumbling foam.
- Squeeze the small clip on the right/upper side of the connector where it meets the unit and remove.
- Then, place the FEMALE MOST LOOP over the plug on the cable. That will bypass the satellite radio receiver.

As mentioned, hope this helps save some grief, and time.
 
  #8  
Old 07-30-2018, 11:33 AM
Junior Member
Join Date: May 2011
Posts: 28
Default

We had this problem and the dealer did the software fix to disable theXM Radio, which is what the cause of the issue is. They did this on our old one, that was out of warranty. Your mileage may vary.

Another solution is to get XM, which can be had for ~$30 for 6 months, if you get the promotion. Ask them to bill you, then pay by check. In 6 months, call to cancel it, and they may offer the same deal again to keep it.
 
  #9  
Old 08-09-2018, 02:27 PM
Junior Member
Join Date: Jul 2018
Posts: 2
Default

Thanks so much all for your help in locating the device - really helpful and very much appreciated.
 
  #10  
Old 08-13-2018, 09:13 PM
Junior Member
Join Date: Aug 2018
Posts: 1
Default

Once the dealer completes the upgrade does that mean the satellite radio no longer works at all?
 
  #11  
Old 08-20-2018, 09:38 AM
Junior Member
Join Date: May 2011
Posts: 28
Default

Originally Posted by BP2011C70 View Post
Once the dealer completes the upgrade does that mean the satellite radio no longer works at all?
In our case, it turns off the Sat Radio so it doesn't work. If you don't have a subscription, then the issue is it is still constantly looking for a connection to check to see if maybe you did subscribe, even when the car is sitting. This in turn drains the battery. If you decide that you want Sat Radio again, you have have them remove the programming and it will be good to go. This was tested on our old one.

Of note, if you take it in for software updates after having it turned off, make sure that it is still turned off. Our old one had it off, then after the last service, it was back on. Since we were selling it, we left it and just mentioned to the new owner about it.
 
  #12  
Old 01-04-2019, 07:44 PM
Junior Member
Join Date: Jan 2019
Posts: 3
Angry Furious!!


Just got back from the dealer (stealer?). They want to charge me $for a NEW RDAR ($845.20) and then an additional $118.26 to reload the RDAR (programming). Additionally the want to charge another $177.20 to “upgrade” my CEM software. Oh, almost forgot, and a new battery ($285.13)…..

I am FURIOUS about this! ~ $1,400 because THEY have a problem with their software!

Oh, and it cost me $132.50 for them to tell me they wanted to charge me this amount.... AARG!!!
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
boxpin
Interior
7
09-17-2014 11:59 AM
Nicole Lolytte Brown
Volvo 240, 740 & 940
4
12-04-2012 10:00 AM
robert213
Volvo 850
22
03-16-2012 12:29 PM
rich nc
Volvo 850
10
10-04-2009 12:13 PM
shelbylay
Volvo S90 & V90
3
02-10-2009 03:10 PM


Thread Tools
Search this Thread
Quick Reply: C70 RDAR battery drain step by step


Advertising
Featured Sponsors
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.