Antenna amplifier Saab 9-5 I рестайлинг

Antenna amplifier

The antenna amplifiers are located in the roof above the respective rear side window and are available in three models, one for antenna system 1 and two for antenna system 2.

The antenna signal is amplified in the antenna amplifier and passed via the coaxial cable to the head unit (radio). The amplifier is powered with a trigger voltage from pin 7 on the head unit and is grounded by being bolted to the body.

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Antenna system 1 comprises

1. AM/FM antenna integrated in the rear right side window.
2. AM/FM antenna amplifier, on right-hand side
3. coaxial cable between the antenna amplifier and the head unit (radio)

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Antenna system 2 comprises

1. AM/FM antenna integrated in the rear right side window.
2. AM/FM antenna amplifier, on right-hand side
3. FM antenna integrated in the rear left side window
4. FM antenna amplifier on the left-hand side
5. coaxial cable between the FM amplifier on the left-hand side and the AM/FM amplifier on the right-hand side
6. coaxial cable between the AM/FM amplifier and the head unit (radio)

Antenna system 2 has a diversity functions, which means that whichever of the two antennas is giving the best signal is used by the radio receiver. The diversity function works only together with the Saab audio systems Premium and Prestige.

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The audio system can also be controlled with the steering wheel switches (the control buttons are located on the steering wheel). The switches comprise two units (six connectors). Detailed information is given in the Owner's Manual.

The steering wheel switches are connected to SID and present information on the connectors that are active. SID sends information on the buttons to the bus which is then read by the main unit.

SID supplies +5 V to the steering wheel switches via pin 22, and grounds them via pin 9.

The six connectors comprise six resistors connected in series. When a button is pressed, the connector in question is grounded (see the table).

When a connector is pressed, the total resistance in the circuit changes, as does the voltage value which SID then reads.

Automatic volume control is controlled by the car's speed to compensate for background noise that occurs when the car is moving. The function is active at speeds over 60 kph.

The main instrument unit (MIU) receives a speed signal from the ABS. MIU sends the information out on the bus where it can be read by the main unit and the volume controlled. The level is raised as the vehicle's speed increases, and lowered as it drops.

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The audio system is equipped with electronic theft protection. Information concerning the theft-protection device is connected in the form of a code to the audio system of the car in which it is installed. Programming is performed with the diagnostic tool.

The theft protection prevents theft by the main unit and CD changer being "married" to the car. If they have not been "married", RADIO CODE or CDC CODE will be displayed when the audio system is turned on.

The audio system checks the validity of the theft protection information (if they are "married") at regular intervals. This also applies if +30 has been temporarily disconnected. If the information is not correct, RADIO LOCKED will be displayed.

If a CD changer has been installed in the car, it will also have unique theft protection information. If the information on the CD changer is not correct (not "married"), CDC LOCKED will be displayed when the CD changer is selected.