DOWNLOADING SOFTWARE AND REPLACING THE CONTROL MODULE
When installing or replacing the accessory electronic module (AEM) the software must be downloaded to the control module. The software for the accessory electronic module (AEM) must be downloaded first. Then the software for the connected accessories must be downloaded.
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 is not OK, the database is updated with the car configuration. When this is complete the software is downloaded.
Scheme 70
The left control lever controls the start timer for the parking heater. No other timer is required when setting the timer control. The control lever is directly connected to the steering wheel module (SWM) (3/130) which sends a signal via the CAN-net to the central electronic module (CEM), which in turn sends the signal on to the accessory electronic module (AEM) (4/78) when it is time to start the electric heater.
The start timer functions on either the electric or fuel-driven parking heater (not XC90). The accessory electronic module (AEM) is not involved when the fuel-driven parking heater is selected. The heater to be used is selected in the driver information module (DIM) (5/1).
It is also possible to combine this function with the remote start function.
Remote starting via the mini call system (certain markets only)
Scheme 71
The remote controlled system for the parking heater functions as follows. The mini call unit receives a signal from the mini call network to start the electrical parking heater or the fuel driven parking heater either directly or using the timer in the car.
Electrical parking heater
A signal is sent via the mini-call unit to the accessory electronic module (AEM) (4/78) to start the electric parking heater. The accessory electronic module (AEM) then sends a signal via the CAN-net to the central electronic module (CEM) (4/56). The central electronic module (CEM) then sends back a signal via the CAN-net to the accessory electronic module (AEM), which then controls the relay for the parking heater.
Fuel-driven parking heater
A signal is sent via the mini-call unit to the accessory electronic module (AEM) (4/78) to start the gasoline driven parking heater.
The accessory electronic module (AEM) then sends a signal via the CAN-net to the central electronic module (CEM) (4/56), which in turn starts the parking heater.
Selection of the type of parking heater is performed in the driver information module (DIM) (5/1).
The remote start function is dependent on good reception/coverage of the mini call network in order to operate satisfactorily.
Remote start via the remote control
The remote start system for the parking heater via remote control functions in the same way as the mini call system. However, the system does not use the mini call network.
The remote control sends a radio signal (FM) to the receiver. In turn, the receiver sends a start/stop signal to the accessory electronic module (AEM) (4/78).
The range of the remote control is approximately 400 meters but varies depending on the other conditions.
Scheme 72
Output signals from the accessory electronic module (AEM) (4/78) are used when installing an after market alarm unit.
Access is available to signals indicating
- the alarm status of the car
- the door status of the car
- the key status.
In this case the accessory electronic module (AEM) functions as a port between the car's CAN-net and the external alarm unit.
Scheme 73
In case of phone calls, the accessory electronic module (AEM) (4/78) receives an input signal from the aftermarket hands-free unit and transmits it on the CAN-net to the audio module (AUM) (16/1) (audio control module (AUD) in XC90). The audio module (AUM)/ audio control module (AUD) lowers the volume in the sound unit's speakers when the aftermarket hands-free unit is used.
The telemute function is available as an accessory for the accessory electronic module (AEM).
Scheme 74
The accessory electronic module (AEM) (4/78) makes it possible to automatically control the telemute function, display lighting and speed-adapted volume control when using an aftermarket radio unit. This is on the condition that the aftermarket radio unit supports these functions. The accessory electronic module (AEM) receives a speed signal (volume adaptation) via the CAN-net and brightness of the display lighting via rheostat from the central electronic module (CEM) (4/56).
The accessory electronic module (AEM) also receives a mute signal from the reverse warning system and external hands-free unit and transmits it on to the radio unit.
Scheme 75
The road and traffic information system, RTI in Japan, uses directly connected input signals from the accessory electronic module (AEM) (4/78) for processing of information.
The accessory electronic module (AEM) sends four signals to the RTI-system. Two of the signals are display lighting and reverse gear signal to the navigation unit, and the third is a speed signal. The fourth signal is a relay control for voltage supply.
The brightness of the display lighting, vehicle speed signal, and the reverse gear signal comes from the central electronic module (CEM) (4/56) via the CAN-net.
Scheme 76
The function of the accessory electronic module (AEM) is to allow certain accessories to exchange information with the car's controller area network. This exchange of information means that accessories can be installed with greater functionality and higher quality. The accessory electronic module (AEM) manages the following functions
- Reverse warning system
- Relay for the electrical engine block heater
- Remote start for the parking heater
- External aftermarket alarm
- Aftermarket radio unit
- Signals for RTI (road traffic information) for Japan
- Tele-mute for non-integrated carphones.
The functions managed by the accessory electronic module (AEM) may vary between different car models.
The accessory electronic module (AEM) is an accessory and is only available for order and installation as an after market item.
Information regarding which production plant a car is manufactured in can be found in the VIN number. The seventh position from the right in the VIN specifies the production plant.
Information regarding which production plant a car is manufactured in can be found in the VIN number. The seventh position from the right in the VIN specifies the production plant.
The control module is installed in the cargo compartment of the car behind the side panel at the right-hand wheel arch.
After installation the accessory electronic module (AEM) is configured using software. Configuration is carried out via VIDA (Volvo scan tool).
The control module communicates with directly connected components, and via a Controller area network (CAN).
One of the main purposes of the control module is to function as an interface between accessories, which are not prepared for Controller area network (CAN) communication, and the Control area network (CAN) of the car and its functions.
The control module checks activations and input and output signals via an integrated diagnostic system. A diagnostic trouble code (DTC) is stored if the control module detects a fault. Any diagnostic trouble codes (DTCs) and stored in the control module memory and information can be read out using VIDA (Volvo scan tool).