| Table 1: | Radio Features |
| Table 2: | Cassette Features |
| Table 3: | Compact Disc Features |
Controls | Radio UM7 | Radio UM6 | Radio U1C |
|---|---|---|---|
Power | Push PWR/VOL knob to turn the radio on. | ||
Volume | The volume is adjusted by rotating the PWR/VOL knob. | ||
Tune | Turn the RCL/TUNE knob. | ||
Seek | Momentarily press the SEEK button. | ||
Scan | Hold SEEK for 4 seconds. | ||
Presets | Six AM, Six FM1, AND Six FM2 | ||
Preset Saving | Press and hold desired button until an audible beep is heard. | ||
Recall | Push the RCL/TUNE button. | ||
Fade or Balance | Press the AUDIO button to select, then use arrow keys to change. | ||
Bass or Treble | Press the AUDIO button to select, then use the arrow keys to change. | ||
Controls | Radio UM7 | Radio UM6 | Radio U1C |
|---|---|---|---|
Eject | -- | Eject Button | -- |
Fast Forward | Preset Button 4 | ||
Reverse | Preset Button 3 | ||
Auto Reverse | Yes | ||
Side | Preset Button 5 | ||
Previous | Preset Button 1 | ||
Next | Preset Button 2 | ||
Scan | Hold Seek for 5 seconds | ||
Repeat | Preset Button 6 |
Controls | Radio UM7 | Radio UM6 | Radio U1C |
|---|---|---|---|
Eject | -- | -- | Eject Button |
Fast Forward | Preset Button 4 | ||
Reverse | Preset Button 3 | ||
Previous | Preset Button 1 | ||
Next | Preset Button 2 | ||
Scan | Hold Seek for 5 seconds | ||
Repeat | Preset Button 6 | ||
Random | Preset Button 5 |
Each item in the list below represents topics covered in detail below:
| • | AM/FM Reception |
| • | Antenna |
| • | Theft Deterrent |
| • | Radio Error Messages |
AM/FM Reception
Radio Signal
The radio signal is sent from a broadcast station and then is received by the antenna. The strength of the signal depends on the following:
| • | The power output - wattage - of the broadcast station |
| • | The location of the vehicle - or receiver- relative to the broadcast tower |
| • | Obstacles between the tower and the receiver |
| • | Atmospheric conditions |
| • | What band - AM or FM - the station is broadcasting |
| • | Type of antenna and the ground plane |
AM Reception
The AM band has a lower frequency range than the FM band. These longer wavelengths:
| • | Bend around obstacles |
| • | Follow the curve of the Earth |
| • | May reflect off the ionosphere |
The AM frequencies have a longer range due to the ground wave. The ground wave follows the curvature of the Earth and is affected by its conductivity. Greater conductivity equates to less signal loss, thus transmission over water is better than over land. The AM band has a range of 80-320 km (50-200 mi).
FM Reception
The shorter wavelengths of the higher frequency FM band:
| • | Reflect off obstacles |
| • | Are absorbed by the ground |
| • | Penetrate the ionosphere |
Broadcasts in the FM band are limited to "line of sight" reception, which is typically 40 km (25 mi). Even when out of direct line of sight, the signal may be reflected into areas that would be in a "shadow" otherwise. Factors that affect the line of sight would include:
| • | Height of the broadcast antenna |
| • | Height of the receiving antenna |
| • | Terrain and buildings in the broadcast path |
Antenna
The antenna system is comprised of a fixed mast antenna that receives radio signals from the broadcast tower.
Theft Deterrent
The theft deterrent system is a feature of all base radios. There is no need to program a security code into the radio, as in the past model years. The theft deterrent system now utilizes class 2 serial data to determine if the radio is in the appropriate vehicle. Each time the radio receives the "run" power mode message, it compares the VIN information it has stored to the VIN information received, from a module on the class 2 serial data circuit. If a mismatch occurs, the radio display will indicate to the user that the radio is locked. Once this takes place, a DTC will set, then the radio will not respond to any button press and it will become inoperative. The only way to unlock the radio is by using a scan tool. Always refer to the table in this section to diagnose the "Theftlock" DTC for further information.
The 2 scenarios able to cause this condition are:
- A radio is installed from another vehicle.
- A module which communicates on the class 2 serial data circuit, which supplies the VIN information to the radio, is replaced and not properly setup with the VIN information for that vehicle.
Radio Error Messages
ERR:
This message is displayed when the radio is unable to play the inserted cassette or CD.
LOC:
This message is displayed when the radio has entered Theft mode.
CAL:
This message is displayed when the radio has detected an invalid calibration.
