Installing radios of radio generation 05.98 > in vehicles >04.98 — VW
Installing radios of radio generation 05.98 > in vehicles >04.98 on VW: factory workshop procedure. Full factory text, tools and checks.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
📋 Procedure
Installing an "ALPHA" unit
When installing an "ALPHA" radio of generation 05.98 ▸ in a vehicle ▸ 04.98, perform the following work steps:
Contact 5 in 8-pin multi-pin connector III, -T8-, black is no longer supplied with positive on "ALPHA" units of radio generation 05.98 ▸. This means that equipment connected such as powered aerial or an additional amplifier can no longer be activated.
Installing a "BETA" unit
When installing an "BETA" radio of generation 05.98 ▸ in a vehicle ▸ 04.98, perform the following work steps:
Remove contact from chamber 5 of 8-pin multi-pin connector III, -T8- and insulate the removed wiring connection.
If a control wire for additional equipment i.e. power aerial or additional amplifier is to be connected to this contact, then reconnect this wire to contact 17 on blue multi-pin connector I, part 3.
Make a wiring connection from chamber 7 to chamber 5 on black 8-pin multi-pin connector III, -T8-.
Therefore chamber 5 is supplied with voltage (terminal 30). If this wiring connection is missing the radio unit cannot be switched on.
If a CD changer is installed the vehicle 10-pin connector -T10- must be converted to the multi-pin connector I connector housing for radio generation 05.98 ▸. Observe current flow diagram and use adapter connection when doing this.
A "beta" unit of the generation 05.98 ▸ used in vehicles designed for radio generation ▸ 04.98 will not work in conjunction with Digital Sound Packet (DSP) system.
Remember also self-diagnosis is not possible with radios of radio generation 05.98 ▸ in vehicles ▸ 04.98 and that the convenience anti-theft system will not function.
Installing a "GAMMA" unit
When installing an "GAMMA" radio of generation 05.98 ▸ in a vehicle ▸ 04.98, perform the following work steps:
Remove contact from chamber 5 of 8-pin multi-pin connector III, -T8- and insulate the removed wiring connection.
If a control wire for additional equipment i.e. power aerial or additional amplifier is to be connected to this contact, then reconnect this wire to contact 17 on blue multi-pin connector I, part 3.
A connection to yellow multi-pin connector I, part 1, contact 6 is also possible.
Make a wiring connection from chamber 7 to chamber 5 on black 8-pin multi-pin connector III, -T8-.
Therefore chamber 5 is supplied with voltage (terminal 30). If this wiring connection is missing the radio unit cannot be switched on.
If a CD changer is installed or the radio unit preamplifier outputs are used, then the vehicle 10-pin multi-pin connector -T10- housing must be converted to the multi-pin connection I of radio generation 05.98 ▸. Observe current flow diagram and use adapter connections when doing this.
A "GAMMA" radio ▸04.98 in a vehicle designed for radio generation 05.98 ▸will not function in conjunction with a DSP system (Digital Sound Package).
Trimming the DSP system of the previous generation and generation 05.98 ▸ is not the same.
Remember also self-diagnosis is not possible with radios of radio generation 05.98 ▸ in vehicles ▸ 04.98 and that the convenience anti-theft system will not function.
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
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The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.