3315684 - E4010 INSTRUMENT PANEL - Functional description (VDC)
Functional description
The instrument panel E50 is supplied directly by the battery at pin 14 connector A from the MAXIFUSE CENTR line B5 and from fuse F18 of B1 . The instrument panel E50 receives a second supply controlled by the ignition (INT/A) at pin 15 of connector A via fuse F1 of junction unit B1 ; pin 16 of connector A is earthed. Pin 13 of connector A receives ignition signal (AVV) from ignition H1: this signal - together with the rpm signal described later - are used to process 'engine running' information. The electronic speedometer receives a speedometer signal from ABS control unit M50 - pin 37 - at pin 2 of connector B of E50 . The speedometer signal is sent out again to the climate control system control unit M70 , the navigator control unit M90 and the radio P20 , from pins 6,7, and 8 of connector B, respectively. A boot opening enablement signal is sent from pin 9 of connector B when the speedometer signal is less than 2 km/h. (see E3045 BOOT OPENING).The internal software also controls the milometer and trip meter. The electronic rev counter receives an rpm signal from engine management unit M10 (pin 47 connector A) at pin 4 of connector B of E50 . The handbrake switch I40 is connected to pin 19 connector C of E50 . The brake fluid sensor K25 sends an earth signal to pin 10 of connector C to constantly light up the warning light but with an insufficient brake fluid level function. This warning light is also lit up by pin 38 of control unit M50 via pin 19 of connector C. Back window heater element enablement is sent from pin 20 of connector B if engine rpm exceeds 1000 rpm. (see E3030 rearscreen and rear view mirror demisting warning light). | The low brake fluid level and handbrake warning light also comes on upon a command from the ABS control unit, together with the 'ABS failure' warning light to indicate a fault in the EBD braking system. (see E7020 ABS). |