Painel de instrumentos – Funcionamento do sistema e componentes

413-01-6 Instrument Cluster 413-01-6 DESCRIPTION AND OPERATION Item Description 28 Water in fuel indicator 29 Head lamp indicator 30 Low beam indicator System Operation Instrument Cluster The instrument cluster contains analog displays as well as warning and control lamps for displaying the system status; in addition, there is an LCD (liquid crystal display) indicator field for driver information. The instrument cluster receives the following signals from the PCM via the high speed CAN (controller area network) Bus (HS-CAN): • Vehicle speed • The PCM receives the necessary signals from the ABS (anti-lock brake system) wheel sensors from the ABS control unit on the HS-CAN • Engine coolant temperature • Engine oil pressure • Engine speed • The instrument cluster receives the following signals from the BCM via the medium speed CAN bus (MS-CAN) • Ambient temperature • Brake fluid level • Handbrake control • Door latch control • Liftgate latch control • High beam control • Headlamp flasher control • Direction indicator control The fuel level signal is sent by the two fuel level sensors in the fuel pumps in the semitrailer tank, which is wired to the instrument cluster. The sensors are connected in series, and the total resistance is determined from the two individual resistors. The instrument cluster converts the raw fuel level signal into a damped fuel level value. The odometer shows the total distance traveled by the vehicle and is based on the same signal as is processed for the daily mileage counter. The value is recorded by the instrument cluster and stored in a protected EEPROM (Electronically Erasable Item Description 31 Engine oil pressure 32 Engine oil change indicator Programmable Read Only Memory) area. This area of memory is protected against manipulation. If the instrument cluster detects an error in this memory area, e.g. through damage, the driver is notified with the "Odometer error" message. Component Description Turn Signal Indicators The turn signal indicators are controlled by the PJB (Passenger Junction Box) on receipt of medium speed CAN bus signals from the instrument cluster. The instrument cluster outputs a voltage to the turn signal indicator switch. The switch contains resistors of different values. When the switch is operated in either the LH or RH direction, the voltage is passed to a ground connection in the instrument cluster which detects the reduced voltage supplied via the resistors. When the turn signal indicator switch is operated in the LH or RH direction, the instrument cluster detects the ground voltage and determines whether a LH or RH selection is made. The instrument cluster transmits a medium speed CAN message to the PJB for operation of the applicable turn signal indicators. The message can contain a number of states for each possible switch position and also an out of range low and high state for circuit faults and an initial value for the switch neutral position. The turn signal indicators are not subject to the 3 second indicator check when the ignition is switched on. The hazard warning indicators are controlled by the PJB on receipt of a completed ground path from the hazard warning indicator switch. The PJB outputs a medium speed CAN message to the instrument cluster which operates both the LH and RH turn signal indicators simultaneously. The hazard warning indicators can operate with the ignition switched off, therefore the CAN message