Power Top INOP

Ryan Mechanic Delaware Posted   Latest  
Resolved
Electrical
2007 Volvo C70 T5 2.5L (B5254T3) 5-spd (AW55-51)
20B2 Hall Sensor

Top won’t move, Lid won’t secure, contents in trunk not interfering. The scan tool says theres an error with hall sensor 3 and code is hard. Cannot get much information on testing these sensors. There’s a power supply from the Convertible Module and I’m assuming that is good because it splices off to numerous other sensors then each sensor has a signal wire to the module. The module is in the trunk and would require closing the top manually. I’m not at all familiar with convertible top repair. Is there a way to test this sensor or am I basically just verifying the wires are good and replacing the sensor? 

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Zachary Mobile Technician
Texas
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Hi Ryan, I'm not finding much in the way of repair information either but I've attached what I did find. I would've expected these hall sensors to be 3 wire but perhaps they ground through the mounting point. If that's the case, then your supply will likely by 5 volts (though it could just as easily be 8 or 12 or whatever Volvo decided.) The signal wire should output a square wave signal when…

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Munjed Technical Support Specialist
New York
Munjed Default
 

Hello, The hall sensor on this roof would read passive or active. Like on or off once the metal moves next to hall sensor will turn active using magnetic field except for one hall sensor in which the sensor does not have a magnet and the magnet is mounted on the vehicle. At this pint you want to check your wiring from the hall sensor to CRM if there is no open or short in the wiring you have…

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Ryan Mechanic
Delaware
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Thanks Munjed, I tried a new sensor the scan tool still reads error on hall sensor 3 data where as all the rest are reading either active or passive. I’m trying to get the top closed so I can access the module. I got the trunk lid up but for the life of us we can’t pull the top out. It seems like something needs to be released. I attached a picture and that’s my view looking down on the rear…

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Munjed Technical Support Specialist
New York
Munjed Default
 

Hello Ryan, First you have to release the hydraulic pressure if you remove the back seat bottom you will find a cable you have to pull it to release the hydraulic pressure in order for the roof to start moving manually. Then you have to reach the trunk manual access hole I have attached a picture. Open the trunk lid's front mountings by turning the electric motor clockwise by hand: Use: 4 mm…

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Ryan Mechanic
Delaware
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The 6mm allen is the part I’m having a problem with the trunk lid layers are in the way and the access is horrible. Guess I’ll have to figure it out somehow. Wish I had a set of the round end allens. Thanks, got any tips on that step?

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Munjed Technical Support Specialist
New York
Munjed Default
 

You have to use the old school allen and it's very tight but the hard part the access panel some times it does not open and it ends up breaking. Did you see the access hole for it?

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Ryan Mechanic
Delaware
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Yea I got the plastic panel open between the rear seat frame and trunk and it tilts back some and I took the plastic plug for the allen out. I actually went for the old school allen from the gate but gave up after a min and started trying other sockets and to be honest I thought that allen was just for securing the front roof lid to the windshield but I guess it serves a dual purpose to support…

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Munjed Technical Support Specialist
New York
Munjed Default
 

No problem I know how pain it is it have worked on the tops more than I care to count. But it have to be done to get the top moving.

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Ryan Mechanic
Delaware
Ryan Default
   

So I got the allen in there but I can only get it to rotate a quarter turn and that doesn’t seem to make the roof wanna budge from the trunk. Also man I can’t get the cover lid to retract into hardtop position either. We’ve tried pulling on either cylinder and relieving pressure. Im more concerned with getting the roof out but man I’m about to throw in the towel on this thing. That gray thing is…

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Ryan Mechanic
Delaware
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Thanks for taking the time out of your day to post that info Zack, I really appreciate it, I’ll be sure to post my findings

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Ryan Mechanic
Delaware
Ryan Update
 

Thanks for taking the time out of your day to post that info Zack, I really appreciate it, I’ll be sure to post my findings

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Munjed Technical Support Specialist
New York
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Did you try to move the latches in the last step? If you look at capture 5 and see if that helps trust me I know how difficult this is. Sometimes when you pull the cable to release the hydraulic pressure the pin doesn't pop up like it should but it's near impossible to see the pin with the roof in the trunk.

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Ryan Mechanic
Delaware
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Ok, so on the driver side in the trunk I seen some wires/conduit that was jammed under one of the roof hinges and after I fooled with it the trouble code is gone. My question is should I just try to close the trunk with the switch? Because I was reading that after depressurizing the system that the pump should be repressurized before operation? But the pump is in the trunk and I can’t get the…

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Munjed Technical Support Specialist
New York
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So if you reach under the access panel in the back seat the pump is directly under it remove the cover over the pump and you have to push the hydraulic pin back down on the pump so when you run the pump it will start moving the roof. It is not easy but that is the only way to get the pressure to build up other wise you still have to move the roof to the closed position.

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Ryan Mechanic
Delaware
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Thanks for your help Munjed, I couldn’t access the pump because the access panel only folds out partially then hits the roof sections. The roof would never release for us, maybe the pressure release cable isn’t working right? It really doesn’t move that much when pulled. I dunno what I’m gonna do. Feel like I gave it my all. Dunno what else to do? Anyways, I wanted to let you know I appreciate…

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Munjed Technical Support Specialist
New York
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No problem it is not an easy job I had to break that access panel before to get to the pump not the best design. Sorry it didn't work out.

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Ryan Mechanic
Delaware
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We had to sub the job out but come to find out it was a break in the hall sensor 3 wire circuit but further down the loom. We never could manually open the roof. Thanks to all that reached out.

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