Question about 2001 BMW Z3

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2000 Z3 power top failure

Top has been operating intermitently and now not at all...adjusted pump to operate manually as per the owner's manual...could it be the switch or fuse related?

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  • dj_dbl_j Feb 16, 2009

    I had the same problem a year ago. I believe some of the wires connecting to the motor were fried. The service technician did a repair to the wires, but said I would be needing a new motor for the top. I think there is now a short in the repair because the battery is constantly draining while in storage.. Didn't do this before the repair was made.

  • krugerm Mar 04, 2009

    I've got the same problem. I've checked the fuses, brake switch, & motors, but have not yet found the problem. BMW suggested that the Hall Effect sensors (which tell the control system how far up the top is) might have shifted, which would prevent the top operating because it thinks it's already up. Have yet to replace because it's an expensive operation - replacement only. Did you have any luck with your problem? Any suggestions?

  • krugerm May 11, 2010

    The motors run fine if I manually short the control switches to turn them on. I figure it's got to be a failure of wiring or switch in the control system - brake switch, top microswitch, or Hall sensor.

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I had the same problem and BMW told me it will cost 1200 AUD to fix. I fixed it for free. inside there is a tiny kill switch above the passanger side. it wont let the roof operate unless you lift the roof. that was the problem. it was faulty. I by passed it and it has been fine for 5 years. I can't find the switch to replace so when I watch and lift the roof like you normaly do when want to open it.

Posted on Dec 20, 2009

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Are the top motors running? If the motors are not running, check the 2 relays by the pump motors. They are known to fail. The part number for the relays are on them.

Posted on Mar 17, 2009

  • greg benton Mar 17, 2009

    If your brake lights are working, then I would probably eliminate the brake light switch. If you have verified the relays at the pump are ok, then I would probably look at the wiring harness. Make sure that it has not rubbed through, especially where the top folds at the hinges. I have seen a few harness cut due to usage.

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07 corvette top will retract but deck lid makes no effort to close, then top will not go back up. Need to release pressure in block lift top up about 1/4 of way then top will go back up


Manually Moving the Folding Top from the Down Position
Important: Allow the system a minimum of four minutes to bleed down pressure after the last cycle.
Manually release the folding top cover latch using the emergency release cable.
Raise the folding top stowage cover.
Manually raise the folding top, holding the 5 bow up.
Manually lower and latch the folding top stowage cover.
Manually unfold the top and latch per normal procedure.

Manually Moving the Folding Top from the Up Position
Important: Allow the system a minimum of four minutes to bleed down pressure after the last cycle.
Manually release header latch per normal operation.
Manually lift front of roof off of the header and raise the #5 bow at the same time.
Manually release the Folding Top Cover latch using the emergency release cable.
Fold the roof down into the well.
Manually close and latch the folding top stowage cover.

Power Folding Top System Components
The power folding top system consists of the following components:
• Folding top control (FTC) module
• Body control module (BCM)
• Folding top control switch
• Serial data communication
• Folding top cover latch actuator
• Folding top cover pull down actuator
• Folding top pump motor with valve manifold
• Position switches and limit switches:
- Pin receiver switch
- Luggage barrier switch
- Folding top cover open switch
- Top open switch
- Top closed switch
- 5 bow raised switch
- 5 bow lowered switch
• Tonneau release relay
• TONNEAU PULL DOWN ACTUATOR Fuse 20 A
• TONNEAU RELEASE Fuse 10 A
• BATT 2 Fuse 40 A
• REAR FOG/ALDL TOP SW Fuse 10 A
• Folding top mechanical components:
- Folding top
- Folding top cover
- Folding top valve 1
- Folding top valve 2
- Folding top valve 3
- Hydraulic lines and cylinders

Folding Top Cover Latch Actuator
The power folding top system includes a folding top cover that is powered open and close by a hydraulic system that is controlled by the FTC module. A power unlatch motor is used to unlatch the folding top cover before the folding top control (FTC) module powers the top cover open. The folding top cover unlatching is requested by the FTC module via class 2 message, but is executed by the body control module (BCM). When requested, the BCM applies battery voltage through the folding top cover release relay control circuit to the tonneau release relay. The relay is energized and battery voltage is applied through the folding top cover release control circuit to the latch actuator. The actuator is energized and the latch releases the folding top cover.

The electronics on this are very complex ,

System Operation
Before any movement of the power folding top is allowed, the folding top control (FTC) module must be aware of the following conditions:
• Unlatch the header. The FTC module reads the pin receiver switch is Inactive.
• The windows must be normalized. Refer to Power Window Reinitialization.
• The ignition must be placed in Accessory or RUN.
• The transmission must be placed in PARK, or with manual transmission, the park brake must be applied.
• Trunk status must not be ajar.
• The luggage barrier must be in place.
• The pump motor temperature must be within the operating range.

After the last cycle of power folding top operation, allow the hydraulic system a minimum of 4 minutes to bleed down before attempting manual operation of the top.
Your best bet take and have it checked for DTC'S - diagnostic trouble codes .
DTC B3666 Rear Tonneau Position Error
DTC B3667 Tonneau Release Circuit
DTC B1011
DTC B1291
DTC B1420
DTC B3602
DTC B3666
DTC B3667
DTC B3670
DTC B3971

Jan 23, 2017 | 2007 Chevrolet Corvette Convertible

1 Answer

Need a 1999 BMW Z3 Roadster owners manual, replacement back windo


I think you can ask this guy for the pdf file for your car, seems like he has everything
http://stores.ebay.com/Fancy-Motorcars?_rdc=1
let me know if you got it

Oct 26, 2009 | 1999 BMW Z3

1 Answer

Roof stopped working


The system uses hydraulic fluid to operate the top if this is low the pump will not come on to open the top.

Sep 09, 2009 | 2001 BMW Z3

1 Answer

Z3 Convertible top - seems to be a common problem


In general, without any testing or diagnosis, you could be dealing with any of the following:

* Open relay - Located at the pump unit
* Close relay - Located at the pump unit
* End position micro-switch
* The operating switch itself
* An issue with the pump unit, but I doubt this, due to the intermittent nature. However, do check the hydraulic fluid level.

The windows do not have to be down for the system to run.

The brake pedal must be pressed while operating the switch. There is a switch at the pedal that signals the convertible top system, but if your brake lights are functioning, the brake switch will not be at fault.

The system is pretty simple and some quick electrical tests should locate the faulty item.

The Bentley repair manual for the Z3 has all of the electrical wiring diagrams, for use in the diagnostics. You can purchase this at Bavarian Autosport 800-535-2002.

Sep 02, 2009 | 2001 BMW Z3

2 Answers

Indicator light for top will not stop blinking


may have to adjust switch or replace

Jul 20, 2009 | 2000 BMW Z3

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

Conv. top is not working, even though the motor seems to be fine


make sure the arm is connected from the conv. top motor to the convetible top. It is located behind the drivers seat by the door jam.

Jun 14, 2009 | 2000 BMW Z3

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

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