Question about 1998 BMW Z3 Roadster

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Convertible top The motor on my '98 Z3 will no longer raise the convertible top. How difficult is the fix? Is there any way to disconnect the motor and close it manually?

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  • magistrate67 Oct 21, 2008

    I have a 1998 z3 and the roof will no longer open and close with the motor. Is there and electrical test function I can perforom at the motor to determine if power is to it?

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They are runon hydraulics you may have a leak in the hose but yes u can disconnect the motor and raise and lower it maunally

Posted on Aug 15, 2008

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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

My Santa always blows over dosent stay up


You did net mention whether you have a convertible or a sedan.
If you have a convertible, you should not have a problem if you raise the top to the closed position. You must also raise all the windows. Please be most careful not to pinch Santa when closing the convertible top. You may get zilch for Christmas.
If you have a sedan, whether 2 door or 4 door, (or hatchback), raise all the windows up and this should fix the problem.
Again, be most careful not to pinch one of his arms in a window. Be blessed.

Nov 19, 2013 | 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.
--------------------------------------------------------------------------------------------------------------------------
VISUAL INSPECTION CHART Mechanical Electrical
  • 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.


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Jun 29, 2011 | 1998 Ford Mustang

1 Answer

My bmw z3 convertible top won't open


your need to have the motor and that circuit check and the modules on the vehicle the operate those functions

Jul 07, 2009 | 2001 BMW Z3

1 Answer

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Before you even begin, I would check prices and availability. A lot of top parts for this are no longer available or VERY expensive. All parts are under panels in rear. Just be patient and remember where they go.

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1999 Mustang convertible top won't raise....


There is a fuse No.20 (15amp) in the under dash fuse panel and a 25amp circuit breaker in the under hood fuse panel that controls the top.

Jun 16, 2009 | 1999 Ford Mustang Cobra

2 Answers

2000 BMW Z3 convertible top stopped moving with motor


There are a number of switches that need to be closed in order for the motor to operate. In particular there's a microswitch in the hood just above the left-hand seat which makes sure the motor doesn't operate until the hood has been lifted slightly.

My hood stopped working and I found the cable to the microswitch had been cut by the hood mechanism. Replacing the cable solved the problem.

May 13, 2009 | 2000 BMW Z3

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

1 Answer

1998 Z3M convertible top


You must ensure that you have your foot on the brake and both windows are half down

Jul 26, 2008 | 1998 BMW Z3 Roadster

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