Puggly Junior with dodgy roof

[Rocket88]

Just dragged this back from Lincoln… electric roof retracts but won’t go back up…. Any bright ideas?

[New POD]

Is their voltage/current at the motor? (Has a fuse gone? If so, why?)

Is the switch dodgy? Try connecting the down switch in place of the up switch. 

If you disconnect the motor from its linkages does it turn? 

Does the motor have any electronics connected to it, which works out where it is ? Like electric windows ? Does it have an overheat/overload function ? 

Is the motor fucked ? 

[vaughant]

- Assuming it's electric operated only!!

My guess would be as it's DC, the switch simply reverses polarity to drive the motor in the other direction. 

I would look at the hood motor itself and see if you can swap the wires round on it. 

Press the down button again and it should drive the motor in the other direction and raise the roof. 

- Assuming it's hydraulic (this is a general explanation). 

The button gets pressed for up and motor should turn the pump which should give pressure to system, usually via a valve to operate the cylinder/ram which extends and lifts the roof. When the roof reaches full height, the motor shuts off or relieves back to tank as full pressure is met so rather than blowing oil out of the  top, it just circulates around the system. 

 

When the motor stops turning, a solenoid operated valve "shuts in" and holds the roof in place.

To lower the roof, Usually pressing the down button simply opens the solenoid  valve and relieves the oil back to tank from the cylinder hence pulling the roof open but if its an awkward design or the roof needs to open quickly, the hydraulic system could have a "2 position valve" or a 4/2 valve (4 ports/2 position) which is solenoid operated. 

The system produces pressure up the the valve block and the solenoid decides which way the oil travels in the cylinder, to the top for down, to the bottom for up. 

Faults - 

If it is pressure up and relief down, most likely relief stuck open so can never make pressure therefore never lift. It should still make a noise but not so anything.

Pump makes no pressure, won't lift again. 

If solenoid operated, the up solenoid could either fail or the wiring to it but the down be ok, if that's the case, swap the solenoids around and it should go up but not down. 

The wiring from the switch to the up solenoid could be open circuit. 

The up part of the switch could be open circuit but down ok. 

 

May sound a bit complicated but it isn't really, all pretty basic stuff however a proper overview of the system would be really helpful. 

 

 

 

[vaughant]

https://www.205gtidrivers.com/forums/topic/62013-cti-electric-hood-wiring/

Sounds like it's hydraulic and has two relays behind a light cluster that corrode. 

 

Good luck, sounds an easy fix. 

[Rocket88]

Managed to release valve and raise roof manually….. going for it’s first MOT for 8 years (!) on Thursday….. fully expect a fail sheet of Shakespearean proportions……