3239404 - E4021 SPEEDOMETER - Functional description (Smart gearbox, Xenon Gas headlamps, VDC)
Functional description
The supply to the speedometer module E10 reaches pin 9 of connector A directly from the battery (maxifuse J/B1of B99 ) via fuse F10 of the junction unit B1 ; the supply controlled by the ignition (INT) reaches pin 10 of connector A from the line protected by fuse F4 of the additional fuse box B98B . Pin 1 of connector A is earthed. The ABS control unit M50 sends the speedometer signal to pin 11 of connector A of E10 . The speedometer signal is resent from pin 15 of connector A towards the climate control system control unit M70. A fuel consumption figure is sent from pin 16 of connector A towards the engine management control unit M10.Functional description
The same signal is sent from pin 14 of connector A to the automatic transmission control unit M54 .Functional description
The same signal is sent from pin 14 of connector A to the electronics of the headlamp F10AFunctional description
The ABS control unit M50 also sends the 'ABS failure' signal to pin 6 of connector A of E10 which lights up the warning light. The signals for the handbrake switch I40 and brake fluid level sensor K25 both reach pin 7 of connector A of E10 .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 . |