Replacing Entire Instrument Carrier
Removing and Installing Entire Instrument Carrier (Z3 Roadster, Z3 Coupe')
Remove steering wheel.
Remove panelling for instrument panel at bottom.
Unfasten screws, then slide instrument cluster straight out of trim and fold over.
Caution! Place cleaning rags on steering column to avoid scratches in glass of instrument carrier.
Push levers on connectors forward and take out connectors.
Installation:
When inserting a connector, lever must be in forward position.
Recode instrument carrier after replacing. Refer to IDC 003/92-14
Installation:
Convert and reset encoding connector when replacing instrument carrier. Tests 15 and 09 below.
Check Function of Instrument Cluster
Since the E36/5 instrument cluster does not feature an on-board diagnosis interface, the following test functions are implemented in the functional scope. Some of them are comparable to familiar on-board computer test functions.
Test functions/overview
With the test functions 0 to 15, cluster reading and adjacent signal modes can be checked. Activation occurs with depressed reset button on trip-distance counter (TWSZ) when vehicle terminal R is selected at the same time.
The lettering "tESt" appears in the mileometer display (GWSZ), followed by the two-digit number "01" in the odometer display panel.
With each subsequent press of the button, the next higher test is selected. If the button is not actuated for longer than 1 second, the corresponding test is carried out.
This causes the letters "tESt" to disappear from the mileometer (GWSZ). The test number continues to be displayed in the odometer (TWSZ). When the button is pressed again, the prevailing test function is interrupted. Lettering "tESt" reappears and the number continues to rise incrementally. Once the last digit has been reached, the system restarts from the beginning.
Test functions 05 to 14 are only executed if test 15 is switched to "lock off". Test 15 is selected when test function is activated to "lock on".
In "lock on" mode, from test number 05, only dashes are displayed in the mileometer (e.g. - - - - - 07).
Functions 01 to 04 are also executed with "lock on".
Termination criterion for test functions 01 to 15: term. R OFF, or selection of test function "00". Apart from test function 01, which terminates automatically after the indicator test, test functions 02 to 14 can also be selected when vehicle is in motion.
Test-function display:
Test 01 Roll mode with system test (sequence as before on E36/4).
Test function 01 enables the workshop to conduct a short test of the instrument cluster. Once the function has been started, at display intervals of 3 seconds, the following information is displayed in the LCD:
Display and point allocation in trip-distance and mileometers (GWSZ/TWSZ)
Next, the microprocessor moves the pointer (speedo, tachometer, tank, coolant temperature) uniformly to limit position and back. All LCD segments are activated for this period of time. The test procedure then terminates automatically. Premature termination occurs when the trip-distance-counter button is pressed with terminal R OFF or continued selection after terminal 15 and also when travel impulses arise. In the latter case, the prevailing km reading is displayed once again.
Test 02 Engine data
Display of engine factor stored in EEPROM for speed signal evaluation; e.g. "3" engine factor 3.
Test 03 Elapsed and evaluated SI mileage in km
The type of the next service due (lubrication or inspection) is indicated by selecting the relevant letters displayed in the service-interval indicator (SIA).
e.g. GWSZ - -8750 = SIA OILSERVICE - INSPECTION
or GWSZ -22450= SIA OILSERVICE - INSPECTION
Basic value not assessed:
Petrol-driven engines: oil service at 12000 km, inspection at 24000 km
Diesel engines: first oil service at 10000 km, second oil service at 20000 km, inspection at 30000 km
Test 04 Elapsed SI days with piloting of clock symbol
Maximum 716 days based on 2 years
Test 05 SI assessment factors fn and ft (0 or 1)
Currently dependent on engine speed and coolant temperature;
Presentation: n0 or n1 ...t0 or t1, where n is the speed factor and t is the temperature factor.
Shaft speed threshold.
Petrol-driven engines 4512 min(-1).
Diesel 3808 min(-1).
Test 06 Tank fill quantity and coolant temperature
Display of values for tank contents and coolant temperature unfiltered.
Presentation in hexadecimal numbers (refer to illustration and table which follows test functions).
Test 07 Engine speed
Display of prevailing engine speed in rpm.
Test 08 Roadspeed
Display of current vehicle road speed always in km/h (not in mph).
Test 09 Status mileage in km
Information and matching of any difference occurring between the km reading in the encoding connector and the redundant value soldered in the EEPROM.
e.g. display GWSZ - - - - - - - signifies identical readings from EEPROM "E" and EEPROM "I"
(E = external EEPROM in encoding connector)
(I = internal EEPROM in instrument cluster)
e.g. display on GWSZ 012654 I
There is a difference in the km readings stored in memory. The value displayed (e.g. 012654 I) is always the lower reading.
The supplement "I" indicates that this is in the internal, i.e. the soldered EEPROM. An "E" signifies the external EEPROM (encoding connector).
In addition, if counter readings differ, the manipulation point lights up.
After replacement of cluster or encoding connector, the higher km reading in the EEPROM can be matched to the lower reading by holding down the reset button when selecting the test function 09 for > 4 secs. At this point, the SIA data is also transmitted. After successful matching, the manipulation point disappears.
Caution! Replacement part must always have a smaller km reading otherwise the vehicle-specific km reading is overwritten.
Test 10 Statusbits (input modes)
Display binary in GWSZ (mileometer)
0 = input low,
1 = input high
Test 11 Statusbit (output modes)
Display binary in GWSZ (mileometer)
0 = Output inactive,
1 = Output active
Test 12 free
Test 13 Display of current national codes
ECE
US
Golf
The code cannot be altered in the workshop.
Test 14 Perform software reset
(watchdog test) or complete reset acts like a power interrupt. When executing the function, a RESET is initiated, the diagnosis level is quit and lock ON is activated.
If implausible faults occur, the test should be conducted before any components are replaced. The test mode is quit automatically.
Test 15 Lock off / Lock on
This function is preset to Lock ON when the test function is switched on. To change over, button must be held down while selecting.
The display then switches every 3 seconds from L ON to L OFF.
Once desired status is reached, release the button.
Test 00 Termination of cluster diagnosis (test function) and return to normal operation.
Fuel-gauge setting Hex value
1st Dash A 0d
End of spare 37
2. Dash B 54
3. Dash C 90
4. Dash D c4
5. Dash E(full) f0
Temp.-pointer setting Hex value
1st Dash A ce
2. Dash B 6d
3. Dash C 5c
4. Dash D(centre) 4f-23
5. Dash E 1e
6. Dash F 18
