sensor BMW 328I CONVERTIBLE 1995 E36 Convertible Tops Manual

CONVERTIBLE TOPS
Convertible Tops - 1
Subject Page
E36 Convertible Tops
Overview .................................................................................................. 2
E36 Automatic Electro Mechanical Convertible Tops ................................ 4
•Features ........................................................................................ 4
•Components
- Control Module ........................................................................... 6
- Top Switch .................................................................................. 6
- Motors ........................................................................................ 7
- Top Drive Linkage/Thrust Rods ................................................... 8
- Top Cover Latches/Drive Linkage................................................ 8
- Micro Switches ........................................................................... 9
- Components Review ................................................................... 11
•Operation ...................................................................................... 12
•EM Top Emergency Operation....................................................... 17
•Re-connecting the drive motors .................................................... 18
•EM Top Initialization ....................................................................... 19
•Control Module Diagnosis/Troubleshooting.................................... 20
•Convertible Top Storage Lid Position Hall Sensor Tests ................. 22
•E36 Convertible Top Adjustments (Repair Manual excerpts) .......... 23
•E36 Convertible Specific Service Information Bulletin Reference.... 29
Z3 Convertible Top
Overview .................................................................................................. 30
•Components ................................................................................. 31
•Operation ...................................................................................... 32
•Adjustments .................................................................................. 33
•Z3 Convertible Specific Service Information Bulletin Reference...... 35

COMPONENTS
CONTROL MODULE:
•Located behind the left side rear seat interior
quarter trim panel (1).
•All relays and operating electronics are installed
in the module. The control module is fully diag-
nosible with the DIS or MoDiC.
TOP SWITCH:
•The top switch is positioned in
the center console.
•The switch of the fully auto-
matic system contains an LED
that flashes when the top is
not fully closed and locked to
the windshield frame.
However, the LED will not
flash when the top is fully
stowed in the top compart-
ment with the lid closed.
Control module memory of lid
position via Hall sensor.
Convertible Tops - 6
LED-Fully Automatic T LED-Fully Automatic T
op Only op Only

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MOTORS:
•Top drive motor (A) with gear assembly and position micro switches (S1 & S2). The top
drive motor is located under the top storage compartment on the left side of the trunk.
•Top storage cover motor (B) with drive linkage and an integrated hall sensor. The cover
motor is located in the trunk on the left side behind the trim cover.
•FULL AUTO ONLY:Top Lock Motor with flexible drive tubes and lock drive mecha-
nisms. The lock drive mechanisms also activate the off tension linkage rods for auto-
matically moving the top to the off tension position.
TOP LOCK MOTOR TOP LOCK MOTOR
FLEXIBLE DRIVE TUBES FLEXIBLE DRIVE TUBES
OFF TENSION LINKAGE RODS OFF TENSION LINKAGE RODS
LEFT LOCK/DRIVE LEFT LOCK/DRIVERIGHT LOCK/DRIVE RIGHT LOCK/DRIVE

Convertible Tops - 13
TENSION BAR RAISED
At the same time the windows are lowering, the top drive motor is switched on and the ten-
sion bar is raised to a vertical position. The drive lever of the top linkage rotates counter
clockwise to push the tension bar to a raised position.
The control module recognizes the raising of the tension bar by the closed contacts of
micro switch S1 in the motor assembly.
When the tension bar has raised to the full vertical position micro switch S2 closes and the
motor is switched off.
STORAGE COVER OPENED
The top storage cover motor is switched on and turns counter-clockwise. This action
releases the locks of the cover via the bowden cables. The locks are forced out of the
clamps by spring pressure.
The drive linkage continues to push the cover to a raised position. A hall sensor integrat-
ed in the cover motor provides status of the storage lid movement and position to the CVM.
The motor is switched off when it reaches the end of its predetermined travel.
S6 also closes the moment the storage cover is released from its locked position. The sig-
nal is provided the GM to prevent the trunk from opening.

TOP ASSEMBLY LOWERED
The top motor turns clockwise immediately opening S1 & S2. It pulls the top into the stor-
age compartment. The tension bar drive linkage is mechanically released from the top drive
as the motor continues to run. Once the top is completely lowered microswitch S3 closes
signalling the control module to switch the motor off.
STORAGE COVER CLOSED
The storage cover motor is switched on and the drive linkage pulls the cover down. As the
locking clamps grab onto the cover locks, the linkage engages the bowden cables and the
cover is locked closed.
The CVM monitors the storage lid position via the hall effect sensor signal. When the fully
closed position is detected, the top cover motor is switched off.
WINDOW RAISING
If the top switch is held down after the top storage cover is closed, the windows will auto-
matically close. The EM top module signals the ZKE to closed the windows. Once the top
switch is released the window operation is terminated.
Convertible Tops - 14

 






 
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Convertible Tops - 19
EM TOP INITIALIZATION
Initialization of the system is required for the CVM to learn the end limits of the top storage
cover. The CVM counts the pulses from the integrated hall sensor in the cover motor to
determine the cover position.
An initialization run occurs automatically after every eighth operation of the top. This
ensures that the hall sensor counting circuit is not adversely affected by any backlash or
elasticity of the top cover drive mechanism.
The hall sensor counter reading is
stored in a NV RAM, however it is
possible for this data to be incor-
rect or out of sync for the following
conditions:
 Power supply interrupted while
top is in operation
 Electrical failures that require
manual closing of the top.
Follow the procedures on this page
or refer to Group 54 in the Repair
Manual of TIS.
INITIALIZATION PROCEDURE
1. The top must be placed in the storage compartment
 Motors engaged with the drives.
 Top storage cover closed
2. Ignition key switched OFF.
3. Press and hold the top switch in the lowering direction.
4. Switch the ignition on (KL R).
5. After approximately 10 seconds the top storage cover will start to close and lock.
6. At this point release the the top switch. The initialization procedure will continue run-
ning. The procedure is complete approximately 0.5 seconds after the top storage cover
is closed and locked.
NOTE: The initialization procedure can be interrupted by switching the ignition off.

Convertible Tops - 20
CONTROL MODULE DIAGNOSIS/TROUBLESHOOTING
 Faults that occur during opera-
tion of the top are stored in the
CVM.
 They are accessed with the DIS
Tester or MoDiC.
 The table reflects the possible
fault codes stored in the CVM.
 Additionally, the diagnostic
requests (status) and compo-
nent activation function pro-
vides quick diagnostic checks
of signal status and output
function of components.
 Always verify the control mod-
ule identification against the
tester display screen when
testing or troubleshooting the
EM top system.
 Always check any associated
or inter-connected systems
when troubleshooting EM top
problems. (ie: ZKE IV).
 Check the coding data to
make sure the control module
is coded correctly for the spe-
cific top system in the vehicle.
 Always use the latest software
available to test and trou-
bleshoot the system.Fault Code Description
1 Short to ground motor
2 Short to B+ motor
3 Position not plausible
4 Distance/time measurement of the
convertible top
5 Fault “rollover sensor”
6 Internal fault of the module
7 Current through CVM too great

CONVERTIBLE TOP STORAGE LID POSITION HALL SENSOR TESTS
Before testing always verify pin numbers and
wire colors from the appropriate ETM.
DC Voltage Test Procedures:
•At X13145 disconnect and access ground
(pin 6) and the hall sensor supply voltage
(pin 3) = battery voltage.
•Re-connect plug and check hall sensor sig-
nal (pin 2), activate convertible top, with
storage lid in motion = 5.0 volts.
Tap switch to display high/low signal - High = 10.0 volts.
Low = 0 volts.
Voltage Frequency Test Procedure:
•With storage compartment lid moving in either direction, pin 2 = 70 Hz.
Convertible Tops - 22
v
v
mV
mA
mA
v
ACOM
FLUKE 87
FLUKE 87
FLUKE 87
Hz