BMW 62121377348 Instrument Cluster Speedometer

Be cautious when working near the instrument panel and its components to avoid static electricity. To ensure no damage is done, take hold of a known good chassis ground prior to handling these parts. For E30 models, switch off the ignition and turn the screws 90 degrees to get rid of the lower dashboard trim. Take out the mounting nuts for the lower instrument panel trim from behind the panel. While removing them, note their lengths and positions - screws located at both bottom and upper part of instrument cluster Remove sliding lock on combination plug then pull instrumet panel forward. Similarly remove other electrical connections then disconnect it by removing cluster. To install connect plugs then install cluster while putting back screws in their original positions Fit trims panels Back in for E36 models, use a soft plastic pry tool to remove Tor fasteners from top left and top right of cluster Carefully release cluster from dash board and partially pull out Pivot upward instrument connector locking bracket then unplug electrical connector from rear of cluster Release mounting screw below headlamp switch in dash The availability for re-coding an instrument cluster should be checked before disconnecting it as it may need be if replaced Disarm SRS system by turning off ignition switch, remove steering wheel using instrument cluster mounting screws Guard top column shaft with cloth or plastic material before tilting down instrument cluster Pull out the cluster after which you will tilt up electrical connector's locking levers towards unplug inserts Connect plugs and push downwards until they click into place while installing cluster Secure it with retaining screws , evacuate NC system refrigerant , install steering wheel , re-arm SRS system and re-code radio.

In case of a dysfunctional speedometer, the remedy is to check and reconnect the speedometer cable on the assembly and the speedometer drive gear. Before connecting the cable you should look for breakage or rounded off edges at the part of the cable which is connected; if there is any damage then you should change the cable. Also, check the wear of the speedometer drive gear and replace it of necessary. To go further: Fit a known good speedometer; if that performs as expected, replace the speedometer assembly. And if the speedometer needle fluctuates at steady speeds, have a look at the route of the cable and remove any sharp bends or twists. If the sheathing is damaged then the cable assembly must be replaced. On speedometer, fix the cable to check for damage, clean the surface, lubricate and re-establish the cable if it is already damaged. Again, when there are issues with the speedometer that only come and go, ensure that the connecting cable is properly fitted on the sending unit, and the harness clamp is well tightened; examine the cable ends to see if they are rounded or damaged and if so, replace same.

The tasks related to the instrument panel removal are quite time-consuming and many connectors should be disconnected before the actual process starts so it is necessary to mark and group those elements that have been disconnected, dismantled or removed. For the 3 series' units, the user should begin with the removal of the negative terminal from the battery and, in case the car is equipped with the SRS, it is advisable to wait for 11 minutes. SRS should be defeated and deleted if required, and then the center console should be detached. Subsequently, pull the glove box; unscrew the mounting bolts, and unplug electrical connectors. Pop out the lower left dash trim plate which is mounted by screws and also has snap clips on the lower part to the driver's side footwell. If fitted then take out the driver side and passenger air bags and then the steering wheel and driver side knee bolster. Go ahead and take out the instrument cluster, headlight switch, radio, climate control head and module, turn signal and windshield wiper/washer stalk switches and the windshield trim on both the left and right side. Take off the reinforcement bar under the steering column and shear bolts, after which lower and stabilize the steering column. Unscrew the glove compartment support frame fasteners and join frame assembly, also to deactivate and uplift the defroster outlets and in addition to that unscrew the mounting bolts with respect to both sides of the dashboard assembly. Last of all, gently remove the instrument trim panel with all the harness connectors and wiring disconnected, and the procedure of installation is in the reverse. For Z3 models, the same as for other models, the process starts with the removal of the negative battery cable and 11-minute waiting followed by the disabling and removal of SRS components. The main cowl, the steering, and driver side knee bolster attachment screws have to be unscrewed. Next remove the instrument cluster, headlight switch, radio, climate control head and module, as well as the turn signal and windshield wiper/washer stalk switches. Pop open the glove compartment, unscrew the finishing caps and screws and, at the right end of the dash, unscrew the trim caps too. Open the glove box, push it to the bottom and unscrew covers. For the internal connectors located close to the X-bracing; you will have to take down some fasteners associated with the passenger's side airbag bracket together with the mounting fasteners within door jamb areas and under the center airs vents. Bolt covers are usually located at the base of the windshield and just pull off the instrument panel from the passenger side and in the same manner the range pull off from the driver's side and bolts are installed at the regular places on the bonnet.

If the above speedometer does not function, examine the speed sensor pickup and change it if it is bad. Check for corrosion of the terminals, loose connections or the broken wires connecting the speed sensor to the speedometer and rectify. To check the correct function, fit an assured fine speedometer; if it runs fine, then replace the speedometer assembly. For an intermittently working speedometer wiring should also be checked and cleaned or repaired if necessary, and on the speedometer itself there is the speed sensor pickup which should be replaced if necessary.