Volkswagen Front Wheel Drive 1974-1989 Repair Guide

Radio

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REMOVAL & INSTALLATION



See Figure 1

Except Heidleberg V and VI Radios
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the knobs from the radio.
  4.  
  5. Remove the nuts from the radio control shafts.
  6.  
  7. Detach the antenna lead from the jack on the radio case.
  8.  


WARNING
Never operate the radio without a speaker; severe damage to the output transistor will result. If the speaker must be replaced, use a speaker of the correct impedance (ohms) or else the output transistors will be damaged and require replacement.

  1. Detach the power and speaker leads.
  2.  
  3. Remove the radio support nuts and bolts.
  4.  
  5. Withdraw the radio from beneath the dashboard.
  6.  

To install:
  1. Insert the radio into the dashboard, then install the radio support fasteners.
  2.  
  3. Connect the power and speaker leads.
  4.  
  5. Connect the antenna leads.
  6.  
  7. Install the control shafts and knobs.
  8.  
  9. Connect the battery cable.
  10.  

Heidleberg V

The Heidleberg V radio is equipped with an electronic locking circuit to deter radio theft. Whenever the radio is removed or the battery is disconnected, the locking circuit code must be entered in order for the radio to operate. There are 2 codes that can be entered, the first is the original factory code. The second is the programmed personal code entered by the vehicle owner. If the codes are not entered the radio will not operate. If the correct code is not entered in 6 tries, the radio becomes electronically locked-up and must be replaced.

The Heidleberg V radio is retained in the instrument panel by means of lock clips at the sides of the radio body. To remove the radio from its mounting position two special removal pins are required. Insert the tools, into the holes, in the side of the radio face plate. The tools will "click" into position. With the tools installed the radio can be pulled from the instrument panel. Disconnect the electrical leads to complete the removal. When installing the radio, be sure to connect the electrical leads in their proper position.



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Fig. Fig. 1: Removal tools for Heidleberg V and VI radios

Heidleberg VI

The Heidleberg VI fix-coded radio is equipped with an electronic locking circuit to deter radio theft. The Heidelberg radio is assigned a fixed four digit security code when it leaves the factory. Unlike the Heidelberg V system, this code cannot be changed. The Heidleberg VI radio is identified by white lettering on the faceplate and separate knobs for the fader, bass and treble controls. After two attempts at entering the security code, the radio will lock-up electronically for about one hour. This is indicated by a "SAFE" display. Unlike the previous generation, the radio will not permanently lock-up no matter how many incorrect coding attempts are made. The reactivation procedure can be repeated indefinitely.

The Heidleberg VI radio is retained in the instrument panel by means of lock clips at the sides of the radio body. To remove the radio from its mounting position, two special removal pins are required. Insert the tools, into the holes, in the side of the radio face plate. The tools will "click" into position. With the tools installed the radio can be pulled from the instrument panel. Disconnect the electrical leads to complete the removal. When installing the radio, be sure to connect the electrical leads in their proper position.

 
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