If your car still has the factory Heidelberg radio/cassette head unit but no Operating Instruction manual, the following list outlines its basic functions.
On/Off, Volume knob: Turn the knob clockwise to switch the unit on; continue turning to increase the volume. Turn the knob counterclockwise to decrease volume and to switch the unit off. When powering the unit on/off, a <click> should be heard.
Balance/Treble: While pressing the on/off knob in, turn clockwise or counterclockwise to adjust the sound balance of right-
Bass control: Turn tab clockwise to increase bass, turn counterclockwise to decrease bass.
Fader control: Adjusts the sound balance of the front and rear speakers.
< > buttons: These are the tuning buttons. When the < button is pressed, the radio frequencies count down; when the > button is pressed, the radio frequencies count up. This is done manually or automatically, depending on where sensitivity selector switch is set.
Sensitivity selector switch: With the switch at the MNL position, radio stations are selected manually. With the switch at the center SEEK position, radio stations are selected automatically, including weaker stations. With the switch at the right SEEK position, only powerful radio stations are selected automatically.
1,2,3,4,5 buttons: Station preset buttons. To store a station, press and hold the desired button. The station will mute for a few seconds; when you hear the station again, release the button. A maximum of 5 FM stations and 5 AM stations can be stored.
AM/FM button: Switches from AM to FM and vice versa.
SCAN button: With the sensitivity selector switch in the MNL position, pressing the SCAN button will automatically search for stations. When a station is found, scanning will stop at that station for 5 seconds. If you like the station, press SCAN again to stop auto searching; if you don't like the station, after 5 seconds the unit will search for the next available station.
METAL button: Press the button in for metal or CrO2 tapes; leave the button out for regular tapes.
Dolby button: Press the button in for tapes recorded by the Dolby Noise-
PRG button: Press this button to change tape play direction.
Click here to download SAFE mode security code instructions.
What size radio will fit? Any single-
Modern head units have an accessory-
An amplified stereo system installed on '91-
Front: 5¼" with 1" tweeters
Accessing the rear speakers
Pry off the cover of the window crank, remove the screw and pull the handle off. Then, gently pry the panel off using a long, flat-
Upgrading the speakers
Depending on the dimensions and mounting hole locations, some aftermarket replacement speakers fit no problem, while others may take a bit of modifying. Those with pre-
Extended window crank assembly parts and part numbers:
You must remove the driver's side wheelhouse liner to gain access to the antenna housing and cable inside the fender to replace the antenna.