Electrical Issue 2006 V70

carm1987 · Post by **carm1987** » 10 Jul 2023, 18:34

Greetings, My 2006 V70 (only 80k miles) starts fine. However, there are some electrical issues which all started last week at the same time.. The AC/blower does not come on, electric seats (both), do not work, sunroof does not work, door locking system does not work. All of these functions have fuses located in the fuse box on the end of the dash board (11C), which receives power from 11E fuse (50A) #6. I checked all fuses in 11E, all are good. 13 V DC on either side of those fuses. I also checked voltages at the fuses in 11C, with the voltage only at about 4 V. What could cause this?? What is between the power at 11E and the Fusebox 11C (end of dashboard). Thank you! Carmine

Post by **scot850** » 10 Jul 2023, 20:38

Look up siren battery leaking. When the siren battery fails and leaks, it takes out the sunroof and can affect other electrical systems too.

Neil.

Post by **firstv70volvo** » 11 Jul 2023, 12:03

carm1987 wrote: ↑10 Jul 2023, 18:34 Greetings, My 2006 V70 (only 80k miles) starts fine. However, there are some electrical issues which all started last week at the same time.. The AC/blower does not come on, electric seats (both), do not work, sunroof does not work, door locking system does not work. All of these functions have fuses located in the fuse box on the end of the dash board (11C), which receives power from 11E fuse (50A) #6. I checked all fuses in 11E, all are good. 13 V DC on either side of those fuses. I also checked voltages at the fuses in 11C, with the voltage only at about 4 V. What could cause this?? What is between the power at 11E and the Fusebox 11C (end of dashboard). Thank you! Carmine

4V at the fuses is a problem. I only have wiring diagram for 2002 model year car and I know after 2004 things changed a lot. Which 11C fuses did you check? The 2006 model year fuses are different but the power distribution should be similar. You shouldn't be seeing 4V at all the 11C fuses.
In the 2001-2004 models there are 38 11C fuses in the passenger compartment, left side of dash and there are three groups of 11C fuses and each of the groups is protected by three different 60A fuses located under the fuse box in the engine compartment. In my wiring diagram these are the 11A fuses. If you have 12V to the engine compartment fuse box you should have 12V at the 11C fuse box if all the 60A fuses are good, or whatever amperage there are in your car. If you do actually have 4V at the 11C fuses I would expect it to be only associated with 1 of the 3 groups of the 11C fuses and possibly due to resistance in the path but that would generate a lot of heat. See if you can find out which 11C fuses have 4V, the car wouldn't start or run if all the 11C fuses have 4V.

carm1987 · Post by **carm1987** » 12 Jul 2023, 03:31

Thank you....If I understand this correctly the 12v should come from a fuse in the rear11E to a fusebox in the engine compartment before it reaches 11C (left side of dashboard)? Thank you... I will check after work....I forgot to mention that my dash board instrument cluster is also inoperative.

Post by **firstv70volvo** » 12 Jul 2023, 07:53

carm1987 wrote: ↑12 Jul 2023, 03:31 Thank you....If I understand this correctly the 12v should come from a fuse in the rear11E to a fusebox in the engine compartment before it reaches 11C (left side of dashboard)? Thank you... I will check after work....I forgot to mention that my dash board instrument cluster is also inoperative.

The 11E fuses protect groups of fuses in the rear fuse box. 12V from the battery is directly connected to the engine compartment fuse box and there are large 60A fuses (11A fuses) that supply power to and protect groups of 11C fuses up front.

I don't think the fuse number will be the same for model year 2006 but there is a fuse in my wiring diagram that is common to the modules you're having problems with, it has to with the EXT. D1 supply voltage. Look for a fuse like this in your car, it will be in the left side dash fuse box. See if you can find this fuse and check it out. It's fuse 24 in the earlier model years, your fuse number may be different.

: 11C 24.jpg (30.34 KiB) Viewed 339 times

carm1987 · Post by **carm1987** » 12 Jul 2023, 10:18

Thank you......I can't wait to check after work. Also....I failed to mention that the electric windows do not function either. I will go through the fuses and check. BTW the fuse number is also 24 on the 2006. Could it be a faullty ECM? If so would that show up on a diagnostic code reader? Thank you for you assistance! Carmine

Post by **jonesg** » 12 Jul 2023, 11:51

its not the ecm.

carm1987 · Post by **carm1987** » 12 Jul 2023, 12:37

Thank you jonesg. I used to teach electronic repair, I am overthinking this.....seems like a power problem for sure. But for all of my symtoms seems illogical for me for it to be a single fuse. I will check when I get home tonight.

Post by **firstv70volvo** » 12 Jul 2023, 14:25

carm1987 wrote: ↑12 Jul 2023, 12:37 Thank you jonesg. I used to teach electronic repair, I am overthinking this.....seems like a power problem for sure. But for all of my symtoms seems illogical for me for it to be a single fuse. I will check when I get home tonight.

Fuse 24 is a power supply (EXT D1) to the climate control module, the upper electronics module, the sunroof module, the display information module and the power seat module. It is controlled by the CEM through a relay, at least for the earlier model years. I believe the relays are solid-state in the CEM from 2005 on. I think this is a time delay power supply when the ignition is turned off, the power continues for some time and then shuts off, it may also be an early wake type power supply too, before the key is in the ignition, I'm not sure though. If this fuse is bad this power will be missing to all these modules so you'll get a lot of codes and a lot of things not working.

carm1987 · Post by **carm1987** » 12 Jul 2023, 15:32

Fuse 24 under the dashboard? My end of dashboard fuses only have 13. I will check...thank you!