Bosch / Grundig car radios — From RCD 300 to CD30

The RCD 300 and RCD 310 are the most common car radios in the Volkswagen Golf V and Golf VI. Behind the VW badge hides a Grundig build — a legacy of the takeover by Bosch in 2003. With Opel, the same story plays out under the name CD30.

Grundig was one of the big names in post-war European electronics. Max Grundig founded the company in 1945 in Fürth, Germany. What began as a maker of radio sets grew into a broad electronics group with televisions, video recorders and audio systems.

In the 1980s and 1990s, Grundig entered the automotive OEM market. Volkswagen was one of the first major customers. Grundig produced radios that were sold under the VW badge — visible to the end user as a VW radio, but technically a Grundig product.

In 2003, Robert Bosch GmbH took over Grundig Car InterSystem — the company's automotive division. At that point Bosch was already the parent company of Blaupunkt. This gave Bosch two major OEM radio suppliers in-house: Blaupunkt for navigation systems and higher segments, Grundig for standard CD radios.

In 2009, Bosch sold off the Blaupunkt consumer branch. The Grundig automotive activities were absorbed into the wider Bosch Car Multimedia division. The Grundig logo gradually disappeared from the OEM units; the technology remained.

What does the RCD naming mean?

RCD stands for Radio CD — a VW-internal designation that says nothing about the manufacturer. Volkswagen used the RCD prefix for several generations of radios, produced by different suppliers:

• RCD 300 / RCD 310 — Grundig/Bosch

• RNS 310 (navigation with DVD) — Blaupunkt

• RNS 510 (navigation with HDD and touchscreen) — Continental

• RCD 510 (CD radio with touchscreen) — Delphi

The RCD 300 is the most basic CD radio in the VW range of that period. It has a single CD slot, RDS and an AUX input on the rear. The RCD 310 adds a USB port on the front, with MP3 support.

How does the RCD 300 differ from older Blaupunkt models?

The Alpha, Beta and Gamma from the Golf III and Golf IV era are Blaupunkt radios. The switch to Grundig/Bosch coincided with the introduction of the Golf V in 2003. A few practical differences:

FeatureAlpha/Beta/Gamma (Blaupunkt)RCD 300/310 (Grundig/Bosch)---------

FormatDIN or 1.5-DINDIN

Serial numberVWZ + alphanumericVWZ + alphanumeric

CD changerExternal changer via cableNot supported on the RCD 300

USBNoRCD 310: yes, front

Build period1991–20032003–2012

Both generations use the same VWZ serial number format on Volkswagen. The manufacturer cannot be worked out from the serial number itself — for that you need to look at the type designation on the unit.

Serial number of the RCD 300 and RCD 310

The serial number is on a sticker on the side of the housing. To reach it, you have to remove the radio. You do this with four removal keys in DIN format:

• Insert the four removal keys into the four round holes at the edge of the front panel.

• Push the pins in firmly until you feel a click.

• Pull the radio forward horizontally.

The serial number starts with VWZ followed by a mix of letters and digits. This format is standard for all VW radios, regardless of the manufacturer.

You can read more about removal and the code on the model pages, such as Golf V or Golf VI.

Grundig at Opel

For the CD30 series, Opel worked together with Grundig/Bosch. The CD30 was the entry-level radio in the Opel range of the mid-2000s. The CD30 MP3 variant added MP3 support via CD-R — not via USB.

The naming can be confusing. Early CD30 examples (before 2003) are sometimes made by Blaupunkt. Examples from 2004 and later are usually Grundig/Bosch. The year of manufacture is a first clue; the type designation on the unit provides certainty.

CD30+ and later variants

The CD30+ is an improved version with an AUX input and improved sound. This is exclusively made by Bosch/Grundig and appeared in models from 2006 onwards.

Opel models with the CD30 series:

• Corsa D (2006–2014) — CD30 or CD30 MP3

• Astra H (2004–2009) — CD30 or CD30 MP3 (later examples)

• Meriva A/B — CD30

• Zafira B (2005–2011) — CD30+

• Vectra C — CD30 (later examples)

See also the model pages Corsa D and Astra H for instructions on the serial number for your specific version.

How does the serial number work with Opel?

With Opel radios the serial number is usually on a sticker that you can see by partially pulling out the radio, or on a sticker in the glovebox. The format differs by model and year of manufacture.

On Bosch/Grundig Opel units, the serial number often starts with BP or an internal Bosch product code, depending on the year of production. Consult the specific model page for the exact instructions.

An overview of the main models:

Volkswagen

• Golf V (2003–2008) — RCD 300 (standard), RCD 310 (option)

• Golf VI (2008–2012) — RCD 300, RCD 310

• Polo IV (2001–2009) — RCD 300

• Polo V (2009–2017) — RCD 310

• Touran I (2003–2010) — RCD 300

• Passat B6 (2005–2010) — RCD 300 (base)

• Caddy III (2004–2015) — RCD 300

Opel

• Corsa D (2006–2014) — CD30, CD30 MP3

• Astra H (2004–2009) — CD30 MP3 (year ≥ 2005)

• Meriva A (2003–2010) — CD30

• Zafira B (2005–2011) — CD30+

• Vectra C (2002–2008) — CD30 (later production)

This is not an exhaustive list. Bosch/Grundig also supplied Seat and Škoda — sister brands of Volkswagen that use the same technical platforms.

In the same period, Volkswagen used several radio manufacturers alongside one another. The model name on the front panel does not always tell you who made the radio. A brief overview:

Radio designationManufacturerPeriod---------

Alpha / Beta / GammaBlaupunkt~1991–2003

RCD 300 / RCD 310Grundig / Bosch2003–2012

RNS 310Blaupunkt2004–2009

RCD 510Delphi2008–2013

RNS 510Continental2007–2015

If you're not sure which type of radio is in your car, check the model page for your VW model for an overview by year of manufacture.

Requesting the radio code works via the serial number of the unit. For VW radios that's the VWZ number on the side sticker; for Opel radios it's the BP or manufacturer number on the sticker on the side or in the glovebox.

Once you have the serial number, you can request the code straight away online. You don't need any extra information — the serial number is enough to retrieve the corresponding unlock code.