BMW 7 Series: Fixed Components

Some of the components that were modular in the Car Communication Computer are now integrated into the CIC as solid state components.

In the event of defects to some of the components, it may be necessary to replace the entire head unit after submitting a PuMA case.

Fig. 17: Bottom Open View Of CIC Components

CIC COMPONENTS EXPLANATION CHART

1. FM/AM aerial connection
2. FM - TMC module
3. FM/AM double tuner module
4. IBOC decoder

Fan

Unlike with CCC, it is not possible to replace the fan of the Car Information Computer separately as part of a service procedure.

The fan provides cooling for the entire hardware assembly, including the hard disk drive and the gateway processor (located directly below it). The exhaust air cools the cooling fins of the HiFi output stage in the power board as it is routed through a cooling channel out of the unit.

Fig. 18: Identifying CIC System's Cooling Fan Location

Gateway Processor

The gateway processor converts all relevant data of the K-CAN system into MOST-bus telegrams and vice versa.

The electronic module is soldered into the board directly under the hard disk drive and cannot be replaced separately.

The gateway processor has its own control unit address in the BMW diagnosis system.

Fig. 19: Identifying CIC System's Gateway Processor Location

GPS Receiver Module

The GPS receiver module is also known as the HIP module (Host Independence Positioning).

Location and route of the vehicle are calculated in the navigation system with the data from the GPS receiver module.

This module was already integrated in the head unit with the CCC system. It has the task of converting the signals received from the GPS antenna together with the data from the DSC control unit and yaw rate sensor.

The following information is calculated in the GPS receiver module:

• Longitude
• Latitude
• Altitude above sea level
• Direction (bearing)
• Speed

This information is known as Almanac data and it is transferred to the navigation system for further processing.

The Almanac data must be permanently stored for future reference. One of the reasons for this is that it takes a long time for data to be received again from satellites after switching to terminal 15 from terminal status ignition "OFF".

This Almanac data ensures the position of the vehicle is recognized immediately after starting the vehicle.

Therefore the navigation system can also be used immediately.

Compared to the GPS receiver module of the Car Communication Computer the GPS receiver module in the CIC has been greatly reduced in size while maintaining the same functionality.

The graphic shows the size of the GPS receiver module compared to the main connection plug of the head unit.

Fig. 20: CIC System's GPS Receiver Size Compared To Main Connector

CIC SYSTEM GPS RECEIVER EXPLANATION CHART

1. GPS receiver module
2. CIC main connection plug

Yaw Rate Sensor

The Car Information Computer features a yaw rate sensor. It supplies the data relating to changes in driving direction for the navigation system.

This data is required for the purpose of determining the exact position as satellite signals cannot be received everywhere (tunnels, underground parking lot etc.).

The yaw rate sensor is a separate module soldered on the main board. It has been greatly reduced in size compared to the yaw rate sensor in the Car Communication Computer.

Unlike with CCC, it is no longer possible to replace the yaw rate sensor separately from the entire unit.

Fig. 21: Location Of Yaw Rate Sensor Soldered To CIC Main Board

Analog Tuner Modules

The tuner modules in the Car Information Computer have enhanced functions compared to the tuners used in the CCC system. The FM/AM and the traffic information (RTTI) range have been expanded.

FM and AM Station List

A double tuner module (see item 1) is installed in the CIC for the FM/AM range.

While one tuner in the network receives the required station and outputs the music signal, the other tuner works in the background searching the station landscape for additional signals and shows them on the display. ("All stations" menu item).

This function in the FM range is already known from the CCC and is now available in the AM range.

The third module in the tuner network enables expansion of the FM-TMC (Traffic Message Channel) functions.

The FM/AM double tuner module and the FM-TMC module combine to form the triple tuner.

Fig. 22: Identifying FM Tuner Module Component Location In CIC

FM TUNER MODULE COMPONENT EXPLANATION CHART

1. FM/AM double tuner module
2. FM-TMC module
3. Black FAKRA connector below the CIC heat sink

IBOC System/HD Radio

The IBOC (In-Band- On-Channel) system is offered as the digital radio. With the introduction of the CIC, the control unit of the IBOC system has been integrated in the head unit as the IBOC decoder.

The IBOC system was developed by the company Ibiquity and, with the aid of a decoder, enables the reception of HD (High Definition) radio through the FM/AM double tuner.

This system simultaneously broadcasts an analog and digital signal.

A special oscilloscope (spectrum analyzer) would show the digital components at both sides of the analog wave of the FM frequency (step shape).

The IBOC system receives the signals with the aid of the FM double tuner module.

These signals are then routed to the IBOC decoder which adds the digital data stream to the audible music signals.

Fig. 23: Location Of IBOC Decoder In CIC

IBOC DECODER EXPLANATION CHART

1. FM/AM antenna connection
2. FM-TMC module

4. FM/AM double tuner module
5. IBOC decoder

Fig. 24: IBOC Station List Menu

There are two types of broadcast services:

• MPS = Main Program Service
• SPS = Secondary Program Service

Both services differ to the effect that the signal previously broadcast analog in the MPS is now used in digital form.

The decoder delays digital reception for several seconds until it is synchronous again with the analog signal previously heard.

SPS offers additional radio stations that are only broadcast in digital form. Using the multicast method, it is possible to accommodate up to seven digital stations in the submenu of the SPS main station. Normally, however, a maximum of 3 sub-menu are offered in the SPS.

Fig. 25: Sub-Menu Of IBOC Main Station

The system automatically switches over to analog FM reception if the digital signal is no longer available.

HD radio is also available in the AM frequency range. In this case, the digital signals are transmitted on directly adjacent frequencies of the analog station. Multicast is not supported on AM. The content of the digitally broadcast station is the same as that of the analog station.

HD radio plays AM radio stations in near-FM quality and FM radio stations in near-CD quality.

CIC Application Board with Processors

The application board accommodates the main processor (CPU = Central Processing Unit) and the main memory modules (RAM = Random Access Memory) for the CIC. These components are soldered into the board and cannot be replaced.

CPU AND MAIN MEMORY EXPLANATION CHART

1. CPU - Central processing unit
2. Main memory (RAM) of the CIC

Fig. 26: Identifying CPU And Main Memory Location

Power Board

The power board is located beneath the CIC heat sink and on the left next to the CIC main connector. It contains both the audio output stages for the speakers of the stereo system as well as the power supply unit for the CIC.

The heat sinks and CIC fan cool the system by dissipating the heat from the power supply unit and amplifier.

The unit interfaces with the vehicle's electrical system (power supply, MOST link, etc.) through the main connector.

CIC MAIN BOARD AND HEAT SINK EXPLANATION CHART

1. Heat sink
2. Power board
3. Main connector of the CIC

Fig. 27: Identifying CIC Main Board And Heat Sink Location

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