Initial Inspection and Diagnostic Overview
System Overview
Control Module
The most important role of the Driver Information Module is to display the status of the systems in the car for the driver. This covers functions such as:
- Vehicle speed
- Engine speed
- Fuel level
- Engine coolant temperature (ECT)
- Various warning signals.
The control module is integrated in the combined instrument panel. When replacing the driver information module, the entire combined instrument panel must also be replaced.
The driver information module mostly communicates with other control modules and components via CAN communication. However some functions are connected directly.
The control module checks input and output signals through an integrated diagnostic system. A diagnostic trouble code (DTC) is stored if the control module detects an error. In certain cases the driver information module replaces the faulty signal with a substitute signal.
Diagnostic trouble codes (DTC) are stored in the control module memory. The data can be read off using the diagnostic tool.
An easy way of checking that the driver information module is both powered and grounded is to check whether the following warning lamps light when the ignition is switched on: Parking brake, Malfunction indicator lamp and Brake fluid level.
Signals
The above table summarizes input and output signals to and from the driver information module. The signal types are divided into directly connected signals, serial communication and Control area network (CAN) communication. The illustration below displays the same information with the Volvo part numbers.
Function
Text messages
In the lower left section of the combined instrument panel (driver information module) (5/1) there is a small window where text messages are displayed. This gives the driver supplementary information for the different warning symbols in order to reduce the number of different symbols in the combined instrument panel. Other types of messages are also displayed, such as the functions of the trip odometer. There is an order of priority where warning signals are displayed first.
Depending on the circumstances, a request for these messages may come from the central electronic module (4/56) or the steering wheel module (3/130). The signals are transmitted via the Control Area Network (CAN).
Outside temperature
The outside temperature gauge is integrated in the tachometer. Its function is to display the outside temperature and to warn the driver when the conditions are icy by displaying a symbol of a snowflake. The snowflake is displayed at a range of -5 to +2 degree C.
A sensor which detects the outside temperature is mounted in the right-hand door mirror. The temperature signal is then read off by either the passenger door module (3/127) or driver's door module (3/126), depending on whether the car is left or right-hand drive. The value is transmitted via the Control area network (CAN) to the central electronic module (4/56) which then forwards the message to the driver's information module (5/1). The temperature is displayed in Celsius or Fahrenheit, depending on the market, in increments of one degree. The temperature unit can be changed when reprogramming.
Clock
The only function of the clock is to display the time in hours and minutes.
The data is transmitted via the control area network (CAN) from the central electronic module (4/56) to the driver information module (5/1).
The customer can adjust the time using a knob on the clock display. The driver information module then transmits the new time to the central electronic module which registers the new data and updates its clock accordingly. The customer can select whether the time will be displayed using the 12 or 24 hour clock. If the 12 hour clock is selected AM or PM is automatically displayed.
Seat belt reminder
The seat belt reminder reminds the driver to put on the seat belt. There are two versions of the seat belt reminder - European and American. They are slightly different, which is outlined below. The signals which indicate the variant in the car (European or American) are transmitted by the central electronic module (4/56) via the Control Area Network (CAN). Two small symbols light in the upper electronic module (4/70) and indicate when a seat belt is not fastened. The driver information module (5/1) emits an audible signal to warn the driver that no seat belt is fastened. From model year 2002 inclusive, there is also a display on the combined instrument panel (5/1) which warns the driver if their belt is not fastened.
European version
If the seat belt is not fastened when the ignition is switched on, the symbols in the upper electronic module will light and there will be an audible signal from the driver information module. This continues for 6 seconds until either the seat belt is fastened or back-up (reverse) gear is selected. If the car travels at 10 km/h or more, the audible signal reactivates if the driver has not fastened his/her seat belt.
American version
When the ignition is switched on, the symbols in the upper electronic module will light continuously for 6 seconds, or until the driver's seat belt is fastened. At the same time there will be a ringing sound from the driver information module for the same period of time. If the driver releases the belt after fastening it, the audible signal will not resume if more than 6 seconds have passed since the ignition was switched on.
Trip odometer/odometer
The function of the trip odometers and the odometer is to display the three available odometer modes. The two settings are the total mileage of the car and the mileage since the two trip odometers were last set to zero. These two can be reset individually. The odometer and one of the two trip odometers are always displayed. The central electronic module (4/56) receives a speed signal from the brake control module (ABS) (4/16) which is transmitted on the high speed section of the Control Area Network (CAN). The central electronic module then transmits the signal on to the driver information module (5/1) via the low speed section of the Control Area Network (CAN). The distance traveled is saved every fourth kilometer and the value is stored in the central electronic module (4/56). Press the button briefly to switch between the two trip odometers. Hold the button in longer to reset the trip odometer. There must be a power supply to the driver information module (5/1) before the odometer can be reset.
Service reminder indicator (SRI)
The service reminder indicator (SRI) lights the first time the ignition is switched on after the service interval has been reached. The service reminder indicator (SRI) will continue to light and remain lit for 2 minutes, every time the ignition is switched on until it is reset. The service indicator has changed from model year 2002. The need for a service is indicated partly by a lamp and partly by a text message - "time for service". Previously only the lamp indicated "Service". The service reminder indicator (SRI) can be programmed in three different ways: distance traveled, time since last service and engine hours since last service. The service reminder indicator (SRI) can be reset using VADIS or as follows:
Hold down the reset button for the trip odometer and turn the key to position II. Continue holding the button down until the service reminder indicator (SRI) begins to flash. Release the button.
Engine coolant temperature (ECT) gauge
The engine control module (ECM), (4/46) processes the value from the coolant temperature sensor (7/16). The processed value is then transmitted to the central electronic module (4/56) on the high speed section of the Control Area Network (CAN). The central electronic module receives the signal and generates a corresponding signal on the low speed section of the Control Area Network (CAN). The driver information module (5/1) reads the signal from the low speed section of the Control Area Network (CAN). The driver receives information about the temperature from the engine coolant temperature gauge in the combined instrument panel. If the value is too high a red lamp lights and a text message is displayed outlining the fault.
Parking brake
A switch is connected to the combined instrument panel (driver information module) (5/1) which detects the incoming signal indicating whether the parking brake is applied or not. The switch is activated and the lamp is lit when the parking brake is applied. This signal is directly connected.
SRS lamp
The supplementary restraint system (SRS) (4/9) contacts the driver information module (5/1) if there is a problem in the system. A signal is transmitted via the Control area network (CAN) and the driver information module lights a lamp and displays a text message. The combined instrument panel also informs the supplementary restraint system (SRS) whether the lamp is working or not.
Brake warning lamp
The brake control module (4/16) (called ABS module on model years up to and including 2001) informs the driver information module (5/1) via the Control area network (CAN) if there is a fault in the brake system. The driver information module indicates this to the driver by lighting the red general warning lamp and displaying a text message.
The brake fluid level sensor detects the level of the brake fluid in the reservoir. When the level is low, a switch in the sensor closes and the warning lamp lights. This function is directly connected to the driver information module.
Fuel gauge
There are two sensors in the fuel tank which transmit signals about the fuel level to the rear electronic module. The rear electronic module (4/58) sends the values on to the driver information module (5/1), which receives the signals, interprets them and displays the fuel level on the fuel gauge. When the fuel level is low a yellow lamp lights to inform the driver.
The fuel gauge is not sensitive to rapid change. This is to prevent incorrect values being displayed when cornering or driving on slopes for example.
Speedometer
The speedometer displays the actual speed the car is traveling at.
Information about the vehicle speed comes from the speed sensor which is connected to the brake control module (called the ABS module on cars up to and including model year 2001) and the transmission control module (TCM) (4/28). The brake control module (4/16) and the transmission control module (TCM) calculate an average speed based on the signals sent from the two front wheels by the speed sensors. The calculated speed signal is then transmitted to the central electronic module (CEM) (4/56) from the brake control module and the transmission control module on the high speed section of the Control Area Network (CAN). Depending on the quality of the signal, the central electronic module uses the signal from the brake control module or the transmission control module (TCM). The central electronic module then transmits this data on to the driver information module (5/1) where it is displayed.
Only cars with automatic transmission have a transmission control module (TCM). In cars with manual transmissions, the speed signal is transmitted to the central electronic module by only the brake control module on the high speed section of the Control Area Network (CAN).
Tachometer
A flywheel sensor (7/25) is connected to the engine control module (ECM) (4/46). The engine control module (ECM) transmits the engine speed signal onwards via the high speed section of the Control Area Network (CAN). The central electronic module (4/56) receives the signal and generates a corresponding signal on the low speed section of the Control Area Network (CAN). The driver information module (5/1) reads the signal from the low speed section of the Control Area Network (CAN). The driver information module receives the value and presents the actual engine speed for the driver.
Lamp for low oil pressure
The oil pressure sensor (7/6) is connected to the engine control module (ECM) (4/46). The engine control module transmits the oil pressure signal onwards via the high speed section of the Control Area Network (CAN). The central electronic module (4/56) receives the signal, and generates a corresponding signal on the low speed section of the Control Area Network (CAN). If the oil pressure is low, the driver information module (5/1) reads the signal from the low speed section of the Control Area Network (CAN). The driver information module indicates this to the driver by lighting a red warning lamp and displaying a text string with explanatory information.
General warning lamp
The function is to display different "faults" in the car. When a lamp lights this is followed by a text message which presents the driver with additional information about why the lamp has lit. From model year 2002 inclusive the color of the lamp has changed from orange to yellow/red. The lamp lights red in the event of serious faults, or yellow for less serious faults.
Malfunction indicator lamp (MIL)
The malfunction indicator lamp (MIL) only lights in the combined instrument panel (driver information module) (5/1), if certain emissions related diagnostic trouble codes (DTCs) are stored in the engine control module (ECM) (4/46) or transmission control module (TCM) (4/28). The signal between the driver information module and engine control module (ECM) is directly connected.
Diagnostic Functions
Description of the Scrolling Values (lamps)
Warning lamp seat belts, value
Indicates whether the lamp is on or off according to the control module.
SRS warning lamp, value
Indicates whether the lamp is on or off according to the control module.
Brake system warning lamp, value
The ABS control module lights or extinguishes the lamp via the control area network. The lamp may assume the value on or off.
Lamp parking brake warning, value
Indicates whether the lamp is on or off according to the control module.
Lamp low oil pressure, value
The oil pressure signal can be read off. The signal comes from the engine control module (ECM). One can read off whether the low oil pressure lamp should be on or off.
Charge lamp, value
Indicates whether the lamp is on or off according to the control module.
Indicator lamp fog lamp rear, value
Indicates whether the lamp is on or off according to the control module.
Malfunction indicator lamp (MIL), value
Indicates whether the lamp is on or off according to the control module.
ABS warning lamp, value
Indicates whether the lamp is on or off according to the control module.
Traction control warning lamp, value
The Brake Control Module (BCM) transmits the lamp signal to the driver information module (DIM) via the Control area network (CAN). Indicates whether the lamp is on or off according to the Driver Information Module (DIM).
Diesel preheating lamp
Indicates whether the lamp is on or off according to the control module.
Trailer warning lamp, value
Indicates whether the lamp is on or off according to the control module.
General orange warning lamp, value
Indicates whether the lamp is on or off according to the control module.
General red warning lamp, value
Indicates whether the lamp is on or off according to the control module.
High beam, value
Indicates whether the lamp is on or off according to the control module.
Lamp low fuel level, value
Indicates whether the lamp is on or off according to the control module.
Description of the scrolling values (other signals)
Fuel level, value
Signal from the two fuel level sensors in the rear electronic module (REM). The value displays between 0 and 80 liters depending on the amount of fuel in the tank.
Engine coolant temperature, value
An engine coolant temperature (ECT) display. The signal comes from the engine control module (ECM) and the temperature is displayed in Celsius.
Engine speed (RPM), value
An engine speed (RPM) display. The signal is between 0 and 8000 rpm and comes from the engine control module (ECM).
Vehicle speed, value
The vehicle speed can be read off. The signal comes from the Brake Control Module (BCM) or the transmission control module (TCM) via the Control area network (CAN).
Brake fluid level, value
The sensor is directly connected to the driver information module (DIM). Indicates whether the control module interprets the signal as low or high level.
Parking brake, value
The sensor is directly connected to the driver information module (DIM). Indicates whether the control module interprets the signal as activated or not activated. With the parking brake applied the sensor is activated.
The SRS indicator lamp status, value
The Driver Information Module (DIM) informs the Supplemental Restraint System Module (SRS) if the indicator lamp is working or is defective.
Cruise control, value
Indicates whether the cruise control status is on or off.
Description of the customer parameters in the driver information module (DIM)
Total mileage, value
Measurement range 0 - 999999 km, 0 - 999999 miles. The parameter can only be programmed once before the read off mileage exceeds 500 km or 310 miles. Programmed by the Central Electronic Module (CEM) after the control module has been replaced.
Distance conditions for service, value
Indicates the mileage required to display the service indicator message. The available values for metric calibrated instruments are 5000, 7500, 10000, 12000, 15000 or 20000 km. The available values for imperial calibrated instruments are 2500, 5000, 6000, 7500, 10000 or 12500 miles.
Time conditions for service, value
Indicates the time required to display the service indication message. The values set are 6, 12, 18 or 24 months.
Engine run time conditions for service, value
Indicates the time the engine must have been running before the service indication message will be displayed. The value set is 500, 750 or 1000 hours.
Displaying zeroes, value
Setting the instrument panel to display or not display the zeroes.
Temperature unit, value
The temperature unit of measurement can be selected. The temperature display can be selected between Celsius or Fahrenheit.
Unit trip computer, value
Setting the trip computer (applies only to cars with trip computer). It is possible to select liters, Imperial gallons or US gallons.
Clock position, value
12- or 24- hour display.
Mileage at service, value
Reading off the mileage at service. The parameter can be programmed between 0 - 999999 km or miles. When resetting the service reminder indicator (SRI) the parameter is reprogrammed by copying the mileage.
CAUTION: Mileage at service should be used with total mileage to determine whether a service is due
Time at service, value
Reading off global time at service. The parameter can be between 0 - 163 months (13.6 years). When resetting the service reminder message, the parameter is reprogrammed by copying the global time in the central electronic module (CEM) to the driver information module (DIM).
CAUTION: Time at service and global time should be used with time conditions to determine whether a service is due.
Engine hours since service, value
Parameter read off. Indicates how many hours the engine has run since the last service. The parameter can be between 0 - 65536 hours. Resets when service reminder message is reset.
CAUTION: Engine time since service should be used with engine hours to service to determine whether a service is due
Global time, value
Reading off the clock in the central electronic module (CEM). The parameter can be between 0 - 163 months (13.6 years).
CAUTION: Time at service and global time should be used with time conditions to determine whether a service is due.
Parking brake warning
Setting the sound signal for the parking brake warning. Parking brake warning can be on or off. The default position is on.
Description of component/function activation
Lamps and displays
The combined instrument panel lamps flash and the gauges sweep from minimum to maximum for 4 seconds.
Warning lamp seat belts, value
Activating the instrument lamp.
SRS warning lamp, value
Activating the instrument lamp.
Brake system warning lamp, value
Activating the instrument lamp.
Lamp parking brake warning, value
Activating the instrument lamp.
Lamp low oil pressure, value
Activating the instrument lamp.
Charge lamp, value
Activating the instrument lamp.
Indicator lamp fog lamp rear, value
Activating the instrument lamp.
Malfunction indicator lamp (MIL), value
Activating the instrument lamp.
ABS warning lamp, value
Activating the instrument lamp.
Traction control warning lamp, value
Activating the instrument lamp.
Diesel preheating lamp, value
Activating the instrument lamp.
Trailer warning lamp, value
Activating the instrument lamp.
General orange warning lamp, value
The orange triangular warning lamp in the center of the instrument panel is activated.
General red warning lamp, value
The red triangular warning lamp in the center of the instrument panel is activated.
High beam indicator lamp, value 1
Activating the instrument lamp.
Lamp low fuel level, value
Activating the instrument lamp.
Downloading Software and Replacing The Control Module
New software can be downloaded into the driver information module. When ordering software, the hardware and the software in the car is compared to the Volvo central database. If the comparison is OK the software is downloaded to the control module.
If the comparison between the car and Volvo central database does not correspond, the database is updated with the configuration of the car. The software download then begins.
The driver information module is integrated in the combined instrument panel. When replacing the control module the entire combined instrument panel must also be replaced.
The language in the combined instrument panel can be changed. This is done by ordering new software for the driver information module from the replacement parts catalogue. In the replacement parts catalogue there is software for reloading the driver information module (reloading driver information module) and software for changing to 15 different languages. Reloading reloads the same software that was installed before the control module was replaced.
There are other functions for the combined control module which can be ordered. However, these are not downloaded into the driver information module but into the central electronic module. There are functions such as the trip computer.
A number of customer parameters can be programmed into the driver information module.
The following data can be programmed into the driver information module. Programming:
- Conditions for the service reminder indicator (SRI) to light, mileage, time and engine hours
- If the instrument panel should display zeroes for the mileage
- Unit for temperature. Fahrenheit or Celsius
- Unit in the trip computer (only applies to cars with trip computers). Fuel consumption can be displayed in liters per 100 km, miles per GB Gallon, miles per US Gallon and kilometers per liter
- 12 or 24 hour clock display.
These customer parameters are stored in the control module but not in the Volvo central database. This means that the customer parameters must be reprogrammed when the hardware is replaced.