Question about 1997 BMW 318

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1993 325i Power Convertible Top will not open

I have checked all fuses, but the top will not lower, any suggestions would be appreciated

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  • randyk1 Dec 02, 2008

    Thanks for your advice, though I would still like to be able to test the microswitch myself and any other possibles before the dealership.



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Has to be rest and tested by bmw dealship something has caused the roof to stop possible the control unit failed, a faulty microswitch in roof or the straps in the roof have failed and thrown it out of timing, cauing it to shout down system.

Posted on Dec 02, 2008

  • thomasdtank Dec 03, 2008

    ok them removed the back seat realse the motors by pulling on the lever, open back boot

    removed the left side brake light cover removed the side trim and u will see two motor reasled. one in the guard does the lide the other does the roof. Leave the motors out, now u can operate the roof manualy open the roof in the open position, and up the lide down push on lide so that u can open the boot lide with the rear roof lide open u cant open boot, get some to push down on lide u will hear the microswitch click that will allow u to open boot, when the boot is open refit the motors buy hand make sure they click back into place them close the boot lide, with the roof in the open postion and the lide down, jump into vehicle, put ur foot on the brake hold the roof buttom in close postion put ign on and wait the lide should go down into lock postion and window should go up once this happens press the open postion and roof should work if not try again realse lever open and close roof by hand but put back into roof down push on lide open boot, refit the two motors make sure they click in close boot, jump into car hold the roof buttom down and try again.



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I have a 2007 mustang convertible top that will not go down. with key on windows go to park down position but no hydraulic pump sound checking fuses to ensure good power. where should i begin?

Principles of Operation
Convertible top operation is controlled by the smart junction box (SJB). When the convertible top raise/lower switch is operated, the SJB commands the front and rear windows to the full down position. Window operation is disabled while the convertible top raise/lower switch is being operated. When the SJB receives a full down input for both rear windows, it commands the appropriate relay closed to raise or lower the convertible top. If the SJB does not receive a full down input signal for both rear windows, the convertible top operation is disabled.

The convertible top hydraulic system uses a 12 volt reversible pump and motor assembly. When active, the pump uses hydraulic pressure to extend the hydraulic lift cylinders to raise the convertible top, or retract the hydraulic lift cylinders to lower the convertible top. The convertible top motor/pump assembly is equipped with a thermal circuit breaker. The circuit breaker typically resets after 5 minutes depending on the ambient temperature. The thermal circuit breaker cannot be repaired and must be installed as a unit with the motor/pump assembly. In the event of a hydraulic system failure, the convertible top cannot be operated manually.

Inspection and Verification
  1. Verify the customer concern.
  1. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart Mechanical Electrical
  • Convertible top brackets and frame
  • Convertible top latches
  • Convertible top pump and motor assembly
  • Hydraulic lift cylinders
  • Hydraulic lines
  • Bussed electrical center (BEC) fuse(s):
    • 13 (40A)
    • 51 (10A)
  • Circuitry
  • Convertible top pump and motor assembly
  • Convertible top ajar switch
  • Convertible top switch
  • Connector(s)
  • Convertible top raise relay
  • Convertible top lower relay
  • LH or RH rear power window motor
  • Smart junction box (SJB)
  • BEC

  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. If the cause is not visually evident, connect the scan tool to the data link connector (DLC) and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:
    • check that the program card is correctly installed.
    • check the connections to the vehicle.
    • check the ignition switch position.
  1. If the scan tool still does not communicate with the vehicle, refer to the scan tool operating manual.
  1. Carry out the scan tool data link test. If the scan tool responds with:
    • CAN or ISO circuit fault; all electronic control units no response/not equipped, refer to Section 418-00 .
    • No response/not equipped for SJB; refer to Section 419-10 .
    • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out self-test diagnostics for the SJB.
  1. If the DTCs retrieved are related to the concern, go to the Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Index.
  1. If no DTCs related to the concern are retrieved, GO to Symptom Chart .
  2. Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1141 Convertible Top Full Down Position Switch Circuit Failure SJB Go To Pinpoint Test E . B1142 Convertible Top Full Up Position Switch Circuit Failure SJB Go To Pinpoint Test E . B1402 Driver Power Window Down Switch Circuit Failure SJB Go To Pinpoint Test A . B2068 Convertible Top Up Output Circuit Failure SJB Go To Pinpoint Test A . B2069 Convertible Top Down Output Circuit Failure SJB Go To Pinpoint Test A . B2481 Convertible Top Up/Down Switch Fault SJB Go To Pinpoint Test A . B2578 Passenger Power Window Down Switch Circuit Failure SJB Go To Pinpoint Test A . All Other DTCs - SJB Refer to Section 419-10 .
  3. Your best bet ,take it to a qualified repair shop !

Nov 05, 2017 | Cars & Trucks

1 Answer

What fuse operates the top on the 1973 buick centurion

check all the glass tube fuses look for one that blowed that would be fuse that control power circuit to windows and convertible top.

Oct 21, 2012 | Cars & Trucks

1 Answer

Top worked fine yesterday but today tried to let down only clicked

It is a hydraulic pump that applies pressure to the 2 hydraulic pistons to raise & lower the top. So, check for something obstructing movement first.

The convertible top:
  • is motor-driven.
  • requires parking brake engaged to complete circuit for operation.
  • is equipped with a back window glass (42006) . The back window glass is permanently attached to the folding top back window curtain (52500) and cannot be opened.
  • Damaged fluid reservoir.
  • Damaged folding top hydraulic cylinders .
  • Damaged folding top motor upper and lower hose .
  • Damaged convertible top regulator.
  • Parking brake not engaged.
  • Open power distribution box circuit breaker CONV TOP (30A), fuse junction panel Fuse 1 (15A).
  • Circuitry open/shorted.
  • Damaged convertible top switch.
  • Damaged raise/lower relay .
  • Damaged folding top hydraulic lift motor and plate kit .

  • Convertible Top Does Not Raise/Lower
  • Open circuit breaker or fuse.
  • Circuitry open/shorted.
  • Damaged folding top switch.
  • Damaged raise/lower relay .
  • Damaged folding top hydraulic lift motor and plate kit .
  • Parking brake not engaged.


Jun 29, 2011 | 1998 Ford Mustang

1 Answer

I have a 2005 PT Cruiser. The convertible top was down. When I went to put it back up, I had no power. The fuse was fine. I bled the pressure off the cylinders and manually put the top up. The wondows on...

HYDRAULIC PUMP/MOTOR ASSEMBLY Any diagnosis of the power top system should begin with the use of a scan tool and the proper Diagnostic Procedures Information. The scan tool can provide confirmation that the Controller Area Network (CAN) data bus is functional, that all of the electronic modules are sending and receiving the proper messages on the CAN data bus, and that the power top motor is being sent the proper hard wired output by the driver window regulator module.

NOTE: The convertible top system is equipped with a hydraulic bypass screw that is used to relieve pressure from the hydraulic system in the event that the top must be manually raised or lowered (such as a low battery or a convertible top operating concern). Always verify that the bypass screw is tight in the pump housing prior to replacing a hydraulic pump/motor assembly (Refer to 23 - Body/Convertible Top - Standard Procedure). If the power top is completely inoperative and the hydraulic pump/motor assembly is suspect, perform the following:

(Refer to 23 - Body/Seats/SEAT BACK - Removal).(Refer to 23 - Body/Convertible Top/ASSEMBLY, Hydraulic - Removal). If not OK, use a scan tool and the proper Diagnostic Procedures Information to complete diagnosis of the power top system.

On convertible vehicles, the convertible top switch is hard wired to both window regulator modules by the Power Top Switch Mux circuit. When a top operation input is received by the driver window module, it will ground the respective relay control circuit which in turn will operate the motor. If the convertible top switch is pressed and held to the down position second detent, it will command both modules to drop all windows to the fully down position. The windows cannot be raised when the convertible top switch is in the top down position. When the switch is held in the top up position and all four windows are fully up, the modules will lower the respective front window 40 mm (1.6 in), lower the respective rear window approximately 55 mm (2 in) and the driver window module will ground the top up relay control circuit. Once the top is back up the windows will not raise automatically.

Your missing that you don't have a clue on how the electronic's on your vehicle work . Your best bet , take it to a qualified repair shop . Your trying to fix something you have no clue on how it works , going at it blind .

Jan 04, 2018 | Chrysler PT Cruiser Cars & Trucks

3 Answers

Convertible top will not close /open

I have had this problem with my 2005 S4 Cab - sometimes the top will not latch. I have found that this was because the fabric near the rear passenger window was not folding into place over the steel structure. I just back up the top and made sure the fabric unfolded and all was well.

Jul 19, 2009 | 2003 Audi A4 Cabriolet

1 Answer

After removing the Hardtop, the softtop will not raise.

I'd check at switch itself first. If you can get a test light on wires at back of switch, you will get power at one, when switched one way, and should have power at another when switch other way.

Apr 26, 2009 | 1995 Mercedes-Benz SL-Class

1 Answer

Automatic convertible top won't open? Is there a way to disengage it and open manually or troubleshoot the problem and fix it?

Check all your fuses there must have been a cut fuse that is not enabling power to reach it.

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Apr 07, 2009 | 1999 BMW Z3

3 Answers

Lowering convertible top

There should be latches you have to pull first to unlock the top from the windshield. Pull down the sun visors, the handles should be under them. Then push the power top switch.

Mar 06, 2009 | 2008 Chrysler Sebring Convertible

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Cannot find the fuse for the convertible top's hydraulic pump

drivers kick panel shows a convertible top fuse , #4 15amp fuse .now i see something in the schematics called TOP STACK , googled it and it refers to a convertible top , wierd , but anyway , it shows a top stack switch , a top stack main relay and a top stack fuse and a top stack relay . if you have the same manual , work with me , does your motor that powers the top have a blue/red and a blue/yellow wires to it , and the switch does it have a blue/red , a blue and a black wire ? do you see in your manual a top stack fuse r/b #3 ?

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Try resetting the pinch protection program. You do this by inserting the key into the drivers side door, turning to the right and holding untill the windows are fully raised. Then you turn to the left and hold untill the windows are fully lowered. This is supposed to reset the program.

Good luck.

Jul 27, 2008 | 2003 Volkswagen New Beetle Convertible

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