GF54.30-P-2001CA Control/Warning Messages, Function
GF54.30-P-2001CA Control/Warning Messages, Function
MODEL 207.3/ 4
Function requirements, general
^ Circuit 15R ON
The circuit 15 status is sent by the electronic ignition lock control unit (N73) over the chassis CAN (CAN E) to the instrument cluster (A1).
control/warning messages, general
The instrument cluster control/warning messages notify the driver about the current state of the systems installed in the vehicle.
The instrument cluster can issue indicator and warning messages in the following ways:
- Optical issue of indicator and warning messages
- Acoustic output of indicator and warning messages
Visual control/warning messages:
The visual indicator and warning messages are displayed using the following instrument cluster components:
- Multifunction display (A1p13)
- Indicator/warning lamps
Audible control/warning messages:
The acoustic indicator and warning messages are issued using the following instrument cluster components:
- Warning buzzer (A1h1)
- Turn signal ticking via function check for turn signal lights, acoustic (A1h2)
The messages shown on the multifunction display are split up according to their level of urgency into four categories:
- Category 1 (messages with highest priority):
Messages in category 1 indicate hazardous conditions and situations and they have priority over messages with lower priority.
These messages are displayed and automatically archived in the message memory within a maximum of t = 2 s after they occur, and cannot be acknowledged. When they occur, a brief warning is emitted by the buzzer.
- Category 2 (messages with medium priority):
Messages in category 2 require action from the driver and appear with a temporary delay of maximum t = 2 s. These messages also include operator feedback. Category 2 messages can be acknowledged. When they occur, a brief warning is emitted by the buzzer.
- Category 3 and 4 (messages with low priority):
These messages are menu notifications and simply provide information to the driver (e.g. low washer fluid level).
No warning chime is emitted.
Messages with low priority are overlaid by messages with high priority. If several messages with the same priority occur, the message currently displayed is cross-faded by the new message after expiry of the minimum display time.
Function sequence for control/warning messages
The instrument cluster informs the driver about the functionality and status of the installed vehicle systems. Safety-relevant system activities or system malfunctions are shown to the driver in the form of control and warning messages in the instrument cluster.
The following display options are provided for this purpose:
- Visual:
- Indicator lamps (green, yellow or blue)
- Warning lamps (red)
- Multifunction display
- Acoustic:
- Warning buzzer
- Turn signal light function check, acoustic
The instrument cluster is connected over the interior CAN (CAN B) and chassis CAN to the vehicle electronics.
Requests to issue control and warning messages from control units that are connected to this Controller Area Network (CAN), are read in by the instrument cluster via the interior CAN or chassis CAN.
Requests to issue control and warning messages from control units which are connected to the diagnostic CAN (CAN D) or front end CAN (CAN G) are sent by the front SAM control unit with fuse and relay module (N10/1) via the interior CAN to the instrument cluster.
Requests to issue indicator and warning messages from the control units, that are connected to the dynamics CAN (CAN H), are sent by the radar sensors control unit (N62/1) (up to 31.5.11) or the video and radar sensor system control unit (N62/2) (as of 1.6.11) over the chassis CAN to the instrument cluster.
Requests to issue control and warning messages from control units which are connected to the drive train CAN (CAN C) are sent by the CDI control unit (N3/9) (with diesel engine) or ME-SFI control unit (N3/10) (with gasoline engine) via the chassis CAN to the instrument cluster.
The systems and functions listed in the table below can request the indicator and warning messages to be issued over the corresponding control unit.
Special case of country-dependent seat belt reminder warning:
If, immediately prior to starting a journey or during a journey, a seat belt is detected to be not fitted, the instrument cluster issues a country-specific optical and acoustic seat belt reminder warning.
The instrument cluster evaluates the following information for issuing a country-specific seat belt reminder warning:
- Sent by the supplemental restraint system control unit (N2/10) via the chassis CAN:
- Driver seat belt buckle restraint system switch status (S68/3)
- Front passenger seat belt buckle restraint system switch status (S68/4)
- Front passenger seat occupied status
- Sent from rear SAM control unit with fuse and relay module (N10/2) over the interior CAN:
- Left rear seat belt buckle switch status (S68/5)
- Right rear seat belt buckle switch status (S68/6)
The seat belt reminder message for the front passenger is only issued, if the front passenger seat is recognized as occupied.
The rear seat belt reminder warning is only issued, if the status of a rear seat belt buckle switch changes during a journey.
If a seat belt is not being worn, the supplemental restraint systems control unit sends a corresponding signal via the chassis CAN to the instrument cluster.
The manner of how the seat belt reminder warning is issued differs in whether the seat belt reminder warning is prescribed by law or not and is incorporated into the assessment through the New Car Assessment Program (NCAP). NCAP is an assessment program for safety in new vehicles.
- Countries with seat belt reminder warning prescribed by law (extended NCAP): Japan, USA, Canada, Arab States of the Gulf and Korea
- Countries without seat belt reminder warning prescribed by law European New Car Assessment Program (Euro NCAP): Europe (ECE), China and Australia.
In countries with seat belt reminder warning specified by law (extended NCAP) the seat belt warning lamp (A1e9) is actuated for a time interval of t = 6 ± 2 s. It is irrelevant here whether the driver seat belt is fitted or not.
If the driver's seat belt is not being worn, the instrument cluster also issues an acoustic warning over the warning buzzer.
If the driver seat belt is fastened during this time interval, the acoustic warning stops sounding.
An assessment of whether the front passenger seat belt is fitted or not given during this time interval.
Only after the time interval of t = 6 s has expired, does the assessment of both seat belts occur.
In countries in which the seat belt reminder warning is not prescribed by law, the seat belt warning lamp is only actuated during the indicator lamp test.
Immediately after detecting an engine start ("Engine running" or "Drivetrain operational" signal set), both the status of the driver restraint system seat belt buckle switch and the status of the front passenger restraint system seat belt buckle switch are evaluated.
If a seat belt is defined to not be fitted, the instrument cluster actuates the seat belt warning lamp.
If the vehicle starts to move, once it reaches a speed of v greater than or equal to 25 km/h, further successive acoustic warnings are issued.
Three or four acoustic warnings are issued in accordance with the seat belt reminder warning. While they are being issued the seat belt warning lamp is actuated by flashing it at a frequency of f = 2 Hz. After all the acoustic warning phases have expired the seat belt warning lamp is permanently actuated.
- Acoustic warning phase 1:
As the vehicle starts to drive off, acoustic warning phase 1 also starts in the background. When a speed of v greater than or equal to 25 km/h is reached a quiet acoustic warning is sounded at an interval of t = 4 s. The acoustic warning phase 1 last for a maximum t = 20 s. This is then followed by a transition to acoustic warning phase 2.
- Acoustic warning phase 2:
After expiry of acoustic warning phase 1 and as from a speed of v greater than or equal to 25 km/h a quiet acoustic warning is sounded for maximum t = 20 s at an interval of t = 2 s.
The transition into warning phase 3 follows.
- Acoustic warning phase 3:
After expiry of acoustic warning phase 2 and from a speed of v greater than or equal to 25 km/h a quiet acoustic warning is sounded for maximum t = 20 s at an interval of t = 1 s.
The transition into warning phase 4 follows.
- Acoustic warning phase 4 (Euro NCAP only):
After the expiry of acoustic warning phase 3 and as of a speed of v greater than or equal to 25 km/h a loud acoustic warning sounds for a maximum of t = 93 s at an interval of t = 0.5 s.
Cancellation of seat belt reminder warning:
- The last acoustic warning phase is fully completed.
- The belt was fitted during the active seat belt reminder warning.
- When the vehicle is stationary the vehicle door on the actuating side is opened.
Seat belt reminder warning reactivation:
- Seat belt release has been detected again.
- If the vehicle is at a standstill and the driver or front passenger door is opened and then closed again
- A new ignition cycle is detected from the time the "Engine running" or "Drivetrain operational" signal is set.
The rear seat belt reminder warning is realized by monitoring the number of belt tabs inserted into the seat belt buckles.
If this situation alters during a journey or at vehicle standstill, without a rear door being opened, the instrument cluster actuates the seat belt warning lamp and the warning buzzer to issue the rear seat belt reminder warning.
If the seat belt reminder warning is issued when the vehicle is moving, it is displayed again another t = 30 s when the vehicle is determined to be at rest. This is contingent on a change in the door status for a rear door while the vehicle is at a standstill. The rear seat belt reminder warning, however, does not exert any effect on restraint equipment deployment, it only serves as information for the driver.
