C2R-AUDI - Car audio interface PAC - Free user manual and instructions

Product Type	Vehicle Integration Module
Brand	PAC
Model	C2R-AUDI
Dimensions (L x W x H)	4.5 x 2.5 x 1.2 inches
Weight	0.3 lbs
Power Source	12V DC (vehicle battery)
Input Type	Speaker-level or RCA
Output Type	Vehicle data bus (CAN/other)
Compatible Vehicles	Select Audi models (e.g., A3, A4, Q5)
Primary Function	Retain factory audio features when upgrading aftermarket stereo
Controls	None (plug-and-play)
LED Indicator	Yes (power/status)
Included Accessories	Wiring harness, module, instruction manual
Installation	Plug-and-play (minimal wiring required)
Operating Temperature	-20°C to 80°C
Housing Material	Plastic
Certifications	CE, RoHS
Warranty	1 year limited

Frequently Asked Questions - C2R-AUDI PAC

How do I install the PAC C2R-AUDI?

Installation is plug-and-play. Connect the module to your vehicle's factory wiring using the provided harness, then connect the aftermarket stereo. Refer to the manual for specific vehicle details.

Which Audi models are compatible?

The C2R-AUDI is designed for select Audi models such as A3, A4, A5, Q5, and Q7 (approx. 2005-2010). Check our compatibility guide online for your exact model.

Does it retain steering wheel controls?

Yes, the module retains factory steering wheel audio controls when used with compatible aftermarket stereos.

Will this work with a non-Bose system?

The C2R-AUDI works with both standard and upgraded audio systems, including Bose. It maintains the original amplifier integration.

What is the power consumption?

The module draws negligible current (less than 0.5A) directly from the vehicle's 12V battery.

Can I use this with a double-DIN stereo?

Yes, the C2R-AUDI supports both single-DIN and double-DIN aftermarket receivers.

Does it have an LED indicator?

Yes, there is a small LED on the module that shows power status. It glows green when connected properly.

What if my car has a factory amplifier?

The module is designed to integrate with factory amplifiers, retaining sound quality and balance.

How long is the warranty?

PAC offers a 1-year limited warranty against manufacturing defects.

Is professional installation required?

While installation is straightforward for experienced DIYers, we recommend professional installation for best results.

USER MANUAL C2R-AUDI PAC

Introduction and Features

The C2R-AUDI interface allows the replacement of a factory radio in select Audi vehicles with CANbus radios. The C2R-AUDI also provides a secondary output for adding an optional PAC Steering Wheel Control (SWC) retention interface (SWI-RC, SWI-CP2, SWI-X). The C2R-AUDI also provides data bus driven outputs such as retained accessory power (RAP), vehicle speed sensor (VSS), illumination, reverse trigger and parking brake.

Important Notes

1. A PAC steering wheel interface must be used in conjunction for SWC retention.
2. Only one of the two provided radio harnesses will be used. Remove the factory installed radio to determine the correct harness for your particular vehicle.
3. Vehicles without a factory amplifier: Connect the aftermarket radio's front and rear speaker wires to the 22-pin plug (dock-n-lock connector) or 16-pin plug (ISO Connector).
4. Vehicles with a factory amplifier: To determine whether the amplifier needs RCA or speaker level input, check the OEM side of the 22-pin or 16-pin connector (depending on which connector your vehicle has behind the radio) to see if the speaker wires are populated. If so hook the front speaker outputs to the main connector and the rear RCA outputs to the 22-pin connector (dock-n-lock connector) or 16 / 20-pin connector (ISO Connector). If there are no factory speaker wires located in the OEM main connector then you will need to hook all 4 of the RCAs from the C2R-AUDI harness to the aftermarket radio's RCA outputs. The blue RCA has no function at this time (dock-n-lock connector only).
5. The Red accessory wire supplies +12v, 1 Amp max when key is in the accessory or ignition position (see fig. 1: If more current is needed).

Wiring Connection Chart

Vehicle Connector

Yellow Battery +12v
Black Ground
White Front	Left + input
White / Black	Front Left - input
Gray Front	Right + input
Gray / Black	Front Right - input
Green	Rear Left + input
Green / Black	Rear Left - input
Purple	Rear Right + input
Purple / Black	Rear Right - input

Interface Connector

Red / White Parking Brake Output (-)

Purple / White Vehicle Speed Output

Blue / White Amp Turn On Input

Red Accessory Output

Orange / White Illumination Output (+)

Green Reverse Output (+)

Illustration / Schematic

Wiring SWCConnection

Connect to Radio
Specific SWC
Interface

Installation Steps

1. Remove the factory radio.
2. Make all connections between the aftermarket radio's harness and the supplied vehicle harness, as described in the wiring connections chart on page 1.
3. Be sure to connect the Blue / White wire even if the vehicle is not equipped with an amplifier.
4. Connect the C2R-CHY4 harness to the vehicle's harness.
5. If retaining SWC, then follow the steps in the next section "SWC Output Connector"

SWC Output Connector

1. The harness has a SWC output connector. For ease of installation, all necessary connections for an SWI have been made for you. Both loops should remain intact.
2. When using this SWC output connector with the SWI-RC, the SWC interface must be programmed for version 2 (refer to SWC interface programming instructions for exact programming sequence and button assignment order).
3. When using this SWC output connector with an SWI-CP2, you can either program the SWC interface with a PC, or set the DIP switches according to the PC app.

Connect to Radio
Specific SWC
Interface

Testing and Verification

1. Turn the ignition on. The LED on the interface will turn on and the +12v accessory wire will turn on.
2. Turn on the radio and check balance and fade.
3. Verify that all SWC are functioning properly.
4. Turn off vehicle and remove key. RAP will be active and will keep the radio on for 10 minutes or until the driver's door is opened.
5. The LED and radio will turn off when RAP turns off or the driver's door is opened.

Technical Support

Technical Support

[e-mail]

866-931-8021