Passat B5 Dome Light Ambient Harness for Polo, Vento, Ameo (PQ Platform)

This harness enabled to instal passat type dome light in Polo, Vento, ameo and such cars. Two harness options for installing Passat B5–style dome lights with ambient illumination in Volkswagen PQ-platform cars. Designed for modders who want an OE-quality interior upgrade without altering factory wiring.

This harness enables seamless retrofitting of Passat B5 dome lights into PQ25 and PQ35-based cars like Polo, Vento and Ameo, ensuring perfect compatibility and safe operation.

Available Variants

1. Plug-and-Play Variant (No Additional Wire Required)

• Pure plug-and-play

• No need to connect anything to fuse box or headlight switch

• Ambient LED stays ON whenever the vehicle is running

• Ideal for quick DIY retrofits

• Zero coding required

2. Ambient-Control Variant (With Single Extra Wire)

Allows the ambient LED to operate exactly like OEM illumination.

Requires connecting one wire to:

• The fuse box (illumination feed), or

• Pin 17 of the headlight switch

Outcome: Ambient LED switches on only when:

• Parking lights are ON

• Headlights are ON

• Auto headlight mode triggers illumination

Provides a precise, factory-style ambient lighting behavior.

Why This Retrofit Harness Exists

The Passat B5 dome lamp offers:

• Built-in ambient LEDs

• Multi-map reading lights

• A premium interior upgrade

However, PQ Polo/Vento/Ameo do not share the same connector layout.
This harness bridges that gap without splicing or altering OE wiring.

Key Features

• Designed specifically for PQ platform Volkswagen cars

• Compatible with Passat B5/B5.5 dome lights with ambient LED

• OE-spec copper wiring with high temperature insulation

• No cutting or soldering required

• Works with both sunroof and non-sunroof versions of the B5 dome lamp

• Two behavior profiles: Always-ON or OEM-Style Illumination Control

Installation Logic

Option 1 – No Extra Wire

• Connect harness

• Install dome light

• Ambient LED remains ON during vehicle operation

• Simplest installation for beginners

Option 2 – With Illumination Wire

• Connect the included wire to:

  • Fuse box illumination pin, or

  • Pin 17 of the PQ headlight switch

• Ambient LED now activates only with:

  • Parking lamps

  • Low beam

  • High beam

  • Auto mode illumination (for upgraded switches)

Gives OEM-style ambient glow like modern VW interiors.

Benefits

• Factory-like finish with no wire cutting

• Additional reading lights improve practicality

• Ambient glow enhances cabin look at night

• Safe and reversible OE-grade wiring

• Easy DIY installation—15 minutes or less

FAQs

Is any original wiring cut or modified?

No. Both harness options maintain factory wiring integrity.

Which variant is suitable for me?

Choose plug-and-play for absolute simplicity.
Choose controlled variant for OEM illumination logic.

Does this cause battery drain?

No. Ambient LEDs draw minimal current and turn off when the vehicle is locked.

Does this work on all PQ Polo/Vento/Ameo trims?

Yes, including Trendline, Comfortline, Highline, GT TSI, GT TDI, and Ameo variants.