Hey, I have this Volvo XC60 2011 that had a battery jump start which blew the starter fuse. After this the current draw is staying around 0.6 - 0.7 Amps after the alarm is armed. When I have only the CEM power from the battery with all battery fuses and main connector removed, I am getting 0.2 Amps.
Should this be zero amps?
It seems that the CEM is not powering down.
Yes it should be zero in a perfect situation. But there’s two variables in play here. One is quality of tool. All have a small margin of error. Least they will read even if it’s 1/1000. Depending on quality of tool .02/.01 might be lowest it can interpret even if it’s less. Secondly no there might be stored power down in devices depending on what those fuses relays power. Just like transformers…
I concur that you should have 0-to very few milliamps in that situation… Tough chicken/egg situation Ive never been done this road, but its not impossible that CEM wont go to sleep unless is gets confirmation from other modules that they are asleep…. would be a very volvo thing to do. And since the cem is connected to everything and the kitchen sink its really hard to prove out everything…
Very true…some amp clamps will provide inaccurate read when measuring low amperage…particularly milliamps. But I imagine that there must be high draw to go through all this additional testing. Hopefully enough time was allowed for vehicle to go to sleep. If so, I would refer to power distribution diagrams for the respective fuse(s) associated with excessive draw.
For me, 50 milliamp is the max. (0.05 amp.) when all is sleeping. You shoud use an amphoud tool to check for parasitic draw…..
The AmpHound is a nice tool but it does the same as the multimeter non-intrusive test.
The current draw was measured using a fluke 88V on the 10 amp setting, inline with aeswave Parasitic Drain Tester. The reading was 200 plus milliamps. A voltage drop test across all the fuses, including those in the cargo area was tested. Only one fuse register the equivalent of 169 milliamps. This fuse is the circuit for the intrusion monitoring system. Since the vehicle doors were open (but…
Use a thermal camera in the morning and see what is hot. With the reverse jump start, it may have burnt a diode or capacitor and now has a drain. When you find a module staying awake, ensure you do not have an input switch stuck on. I had a door lock switch sticking on a honda that would not let the body module go to sleep.
I will recheck to see if a module is still communicating with the CEM. I don't have a thermal camera.
I love mine for current draw tests. I set the car up with a trickle charger to make sure the battery does not go dead and scan the whole car in the morning when everything is cool. I have seen the heat from modules inside of center consoles, seat motors stuck on, radio units glowing with heat, and relays stuck on and hot. It takes a few minutes to set up the car with the windows open and the…
I got the snap-on one that I like for the stand-alone tool. I have heard that others like the ones that you can hook to a phone and they are a lot cheaper.
I'm no Volvo expert but they had issues on the older generation with alarm/siren modules where their internal backup battery would fail and leak acid into the module. One of the failure modes is excessive draw. I assume by "doors open but locked" you mean the latches were manually closed to tell modules the doors were closed. There shouldn't be 170mA draw on any electronic system in standby. If…
A month ago I diagnose a faulty siren module and removed it then. So it is not present. Customer has not gotten a new one as yet. I checked today and know that thw CAN MS bus is always active. So I will test to see which module is keeping it alive.
Can the CEM be programmed using a Jbox? Is there a link to Volvo subscription page?
yes on j-box, Ive used successfully many times. volvotechinfo.com is where we go in CONUS. I dont know if you will have a different place to go not being in the us?
Is anyone here do remote programming for this Volvo XC60?
Waiting on alarm siren from customer before moving forward.
Ok, this vehicle is fixed. Customer brought the alarm siren today and after it was installed the network when to sleep 5 mins after locking with the remote. It seems a bit counter productive that the software would keep checking for the siren without ceasing at the expense of the battery.