Question about 1999 Jaguar XK8

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Convertible top pump

Top won't come up

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  • Ron Rhoades Mar 19, 2014

    where is the hydraulic pump located & Circuit Breaker?

  • Ron Rhoades Mar 19, 2014

    where is the pump located?

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The pump is in the boot/trunk above the CD player

Posted on Mar 22, 2014

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Posted on Jan 02, 2017

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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

Rear lid on 2006 911 convertible top won't lock or unlock


like a trunklid? be looking to fuses first then locks themselves..

Jan 21, 2013 | Porsche 911 Cars & Trucks

2 Answers

2002 clk 320 convertible top won't go down


Can you hear the convertible pump running at all when you hit the button. Most are hydronic. It might be low on fluid. Either that or check the relay

Aug 19, 2012 | Cars & Trucks

1 Answer

My 1993 Ford Mustang convertible won't go up.But the motor is coming on.Also it will go down thou


There must be a hydraulic fluid leak somewhere. Check to see if there is oil filler cap on your hydraulic pump located in the trunk compartment. Fill if necessary with just enough fluid to raise the top. The reason it won't go up is cause it is lacking pressure from the low fluid

Jun 26, 2012 | 1993 Ford Mustang

1 Answer

Rag top / convertible top motor/pump won't work. Needs fluid or motor?


most soft tops are operated with an electric wiper motor could be just a rust problem, check behind the seat or in the boot of the car, these are normally behind a panel, a little Q20 should sort it out

May 09, 2017 | 2000 Ford Mustang

1 Answer

Convertible top will not go up


The problem could be hydraulic or electrical or a mechanical problem with the lift arms. More information is required to solve your problem - like: Can you hear the pump motor running when you press the button? Does the top TRY to lift, but just won't go all the way? Does it try to come up on one side and not the other?

Mar 17, 2012 | 1997 Chrysler Sebring

1 Answer

I have a 2004 convertable beetle and I have had nothing but problems. When I try to put the top down it won't lock into place. When I get frustrated with it I just want to put the top back up and it...


I can not stop my car from dinging every time I put on the breaks. The sensor for the top is flashing but i know the top is closed. I need to find someone that knows how to disconnect the wire.

Jul 22, 2011 | 2004 Volkswagen New Beetle Convertible

2 Answers

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 ?

Jan 09, 2009 | 1992 Toyota Celica

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