RP4.2-MB11 - Car audio interface PAC - Free user manual and instructions

Product Type	Vehicle Radio Replacement Interface
Brand	PAC
Model	RP4.2-MB11
Compatible Vehicles	2014-2016 Mercedes Sprinter with factory radio
Dimensions (approx)	4 x 2 x 1 inches
Weight (approx)	0.2 lb
Power Supply	12V DC (vehicle battery), Accessory output: 10A max
Main Functions	Retain steering wheel controls (SWC) and reverse camera; provide retained accessory power (RAP), vehicle speed signal (VSS), illumination, reverse, parking brake outputs; support short press/long press dual command; compatible with VS41 for additional cameras
Radio Compatibility	Alpine, JVC, Kenwood, Clarion, Pioneer, Sony, Fusion, and others (Advent, BOYO, Dual, Lightning Audio, Rockford Fosgate, Visteon)
Wiring Connections	Interface Connector 1 (Red: accessory, Yellow: constant 12V, Black: ground); Interface Connector 2 (3.5mm SWC, Pink: MS-CAN+, Pink/Black: MS-CAN-, Blue/Yellow: SWC, Orange/White: illumination, Pink: VSS, Violet/White: reverse, Light Green: parking brake); Vehicle Connector (speaker wires, power antenna)
Installation Requirements	Set DIP switches according to radio brand before connecting; wire per connection chart; connect SWC to aftermarket radio; optional VS41 connection for cameras
Programming	Optional: press programming button, press SWC button, release within 1.5s for short press or hold until LED blinks for long press
Maintenance and Cleaning	Keep dry; avoid moisture; clean with soft dry cloth; no liquid cleaners
Safety Precautions	Disconnect vehicle battery before installation; avoid short circuits; ensure proper wire gauge
Spare Parts and Repairability	No user-serviceable parts; contact PAC for replacements or support
General Information	Designed for seamless integration; retains factory features; supports aftermarket radio upgrade

Frequently Asked Questions - RP4.2-MB11 PAC

Which vehicles is the RP4.2-MB11 compatible with?

The RP4.2-MB11 is compatible with 2014-2016 Mercedes Sprinter vehicles equipped with a factory radio. Vehicles with the radio delete package require the RP4.2-MB21.

What are the DIP switch settings for my aftermarket radio?

Set the DIP switches on the side of the interface according to the radio brand: Alpine: 1 ON, others OFF; JVC: 2 ON; Kenwood: 1 & 2 ON; Clarion: 3 ON; Pioneer/Other: 1 & 3 ON; Sony: 2 & 3 ON; Fusion: all OFF; Other (Advent, BOYO, Dual, etc.): 1,2,3 all ON. ON = down.

How do I retain the factory steering wheel controls (SWC)?

Connect the SWC wire (Blue/Yellow) or 3.5mm jack from the interface to the wired remote input of the aftermarket radio. The interface comes pre-programmed with default SWC functions and does not require additional programming unless you want to reassign functions.

How do I program short press/long press dual command functionality?

Press the programming button until the LED turns green. Within 7 seconds, press the steering wheel button. For short press, release within 1.5 seconds (LED turns back on). For long press, hold until LED blinks, then release. Repeat for each function. The LED will flash 3 times to confirm completion.

Can I add additional cameras to the RP4.2-MB11?

Yes, by connecting the VS41 module. The VS41 plugs into the expansion port and provides left, right, front, and rear camera inputs. The left and right cameras are triggered by turn signals, and the front camera by a supplied 3-way toggle switch (active only below 6 mph).

What are the default SWC button assignments?

Default assignments vary by radio brand. Common functions: Volume +/-, Track +/-, Answer (Receive/Off Hook/Send), End (Reject/On Hook/End). Refer to the default chart in the manual for exact mapping.

How do I reset the interface to factory default settings?

Press and release the programming button on the side of the interface once, then wait 7 seconds. The LED will flash 3 times, indicating reset to default SWC programming.

Do I need to program the interface if I don't want to change SWC functions?

No, the interface is pre-programmed with default SWC functions for each radio brand. Programming is only required if you wish to reassign functions or use short press/long press dual commands.

What does the Status LED indicate?

The LED on the interface turns green when in programming mode, red when a steering wheel button is pressed, and flashes to confirm programming or button press. During normal operation, it blinks with SWC presses and stays on with ignition.

How do I verify that the installation is successful?

Turn ignition on: LED on interface should light, and accessory wire should power the radio. Test SWC: each button press should cause the LED to blink. Check balance/fade on radio. Verify reverse camera and navigation outputs. If using VS41, test turn signal triggers and front camera switch.

USER MANUAL RP4.2-MB11 PAC

Introduction & Features

The RP4.2-MB11 interface allows the replacement of a factory radio in a 2014 - 2016 Mercedes Sprinter vehicle equipped with a factory radio. Using this interface will retain the factory steering wheel controls (SWC) and reverse camera. Use of this interface also allows you to program two radio functions to each SWC button by using short press long press dual command functionality. The RP4.2-MB11 also provides data bus driven outputs such as retained accessory power (RAP), vehicle speed signal (VSS), illumination, reverse and parking brake.

Important Notes

1. The RP4.2-MB11 is ONLY compatible with the 2014 - 2016 Mercedes Sprinter vehicle when the vehicle is equipped with a factory radio. Vehicles equipped with the radio delete package will need to use the RP4.2-MB21.
2. The VS41 can be connected to the RP4.2-MB11 to add left, right and front camera inputs. When the VS41 is connected, the RP4.2-MB11 will send the proper signals to the VS41 so that the left and right cameras are triggered when the turn signals are active. The front camera can be triggered by using the supplied 3-way toggle switch.
3. The front camera, when triggered via the supplied 3-way toggle switch, will only be active at speeds below 6 mph.

Wiring Connection Chart

Interface Connector 1

Red	Accessory Output (10 amp)
Yellow 12v+	Constant
Black Ground

Interface Connector 2

3.5mm Jack	Steering Wheel Control Output
Pink	MS-CAN + Input
Pink / Black	MS-CAN - Input
Blue / Yellow	Steering Wheel Control Output
Orange / White	Illumination Output
Pink	Vehicle Speed Signal Output
Violet / White	Reverse Output
Light Green	Parking Brake Output (-)

Vehicle Connector

Yellow +12v	Constant
Black Ground
Blue Powered Antenna Turn On
White Front	Left + input
White / Black Front Left - input
Grey Front	Right + input
Grey / Black Front Right - input
Green Rear	Left + input
Green / Black Rear Left - input
Purple Rear	Right + input
Purple / Black	Rear Right - input

Module Layout

Installation Steps

SET RADIO DIPSWITCHES (ON = DOWN)

Alpine JV	C Kenwood Cl	larion Pioneer	/ Other Sony	Fusion
None 1 2	1 & 2 3 1 & 3	2	& 3

Other = Advent, BOYO, Dual, Lightning Audio, Rockford Fosgate, Visteon

1. The radio select DIP switches on the side of the interface must be adjusted to the proper radio setting before plugging the interface into the vehicle.

2. Make all connections as described in the connection chart on the previous page.

3. Connect the SWC wire or 3.5mm jack to the aftermarket radio (aftermarket radio must support a wired remote input).
4. If using the VS41, connect the 10-pin connector from the VS41-HAR to the RP4.2-MB11's expansion port.
5. If using the VS41, connect the cameras to the proper inputs on the VS41-HAR.
6. Mount the supplied 3-way switch, which will force both the front camera (when using the VS41) and rear camera, where it is easily accessible.
7. The blind spot cameras will be activated with the use of the turn signal stalk. The passenger side camera will be active when the right turn signal is active. The driver side camera will be active when the left turn signal is active. If more control is needed to activate the side cameras, simply flip DIP Switch 4 down (ON). With DIP Switch 4 on it will require a double tap of the turn signal within 2 seconds to activate either the right or left camera. The turn signal will need to remain in the on position for the camera to remain active.
8. Once the DIP Switches have been set and all connections have been made, plug the interface into the vehicle.
9. If you wish to reassign functions to the SWC, or utilize short press long press dual command functionality follow the optional programming instructions on the next page.

Module Wiring Overview

Steering Wheel Controls

Default Steering Wheel Control Programming

IMPORTANT! The interface comes pre-programmed for all of the vehicle's factory SWC functions and does not require programming unless you wish to re-assign the SWC functions, or utilize short press long press dual command functionality. The SWC can always be restored to default settings by pressing and releasing the program button on the side of the interface once then wait 7 seconds for the LED to flash 3 times.

Default SWC Button Assignments

	Alpine JVC Kenwood Clarion Pioneer / Other Sony Fusion
Volume +	Volume +	Volume +	Volume +	Volume +	Volume +	Volume +	Volume +
Volume -	Volume -	Volume -	Volume -	Volume -	Volume -	Volume -	Volume -
Arrow Up	Track +	Track +	Track +	Track +	Track +	Track +	Track +
Arrow Down	Track -	Track -	Track -	Track -	Track -	Track -	Track -
Answer	Receive	Receive	Off Hook	Send	Answer	Answer	Power
End	End	Reject	On Hook	End	End	Reject/Source	N/P

Circular black button with four directional arrows and document icons on the central circle (no text or symbols)

Circular mechanical component with four arms and a central hub, featuring a plus sign and two curved gauges (no text or symbols)

Optional Steering Wheel Control Programming

If you wish to re-assign the SWC functions, or utilize short press long press dual command functionality, the interface must be programmed in the specific order shown in the chart on page 3. If you come across a function in the chart that your steering wheel does not have, or you do not want to program, press and release the programming button on the side of the interface to skip that function. The LED will flash off and on confirming that you have successfully skipped that function and are ready to proceed to the next one.

Short Press Long Press Dual Command Functionality

This feature allows you to assign two aftermarket radio functions to each of the vehicle's SWC buttons. It can be used with as many of the buttons as the user likes, or none at all. When this functionality is implemented, quickly pressing and releasing a SWC button will initiate the short press command, while pressing and holding a SWC button for longer than two seconds will initiate the long press command. Please note that no long press commands are programmed by default. If you wish to assign dual command functionality to the SWC please follow the programming steps on the next page.

Steering Wheel Controls (cont.)

Optional SWC Programming Procedure

1. Turn the key to the ignition position.
2. Put the Driver Information Center (DIC) in the vehicle's instrument cluster into the Audio or Telephone mode using the Page Up or Page Down buttons on the steering wheel. Failure to do this will not allow the Arrow Up and Arrow Down buttons to be programmed.
3. Press and release programming button on the side of the interface. The Status LED will turn green.
4. Within 7 seconds, press the button that is to be learned on the steering wheel. The LED will turn red when the button is pressed.

At this point you have two options:

A. For short press functionality: Release the button within 1.5 seconds. The LED will turn back on.
B. For long press functionality: Hold the button until the LED starts blinking. Release the button and the LED will go back to solid green.

1. If you need to program more buttons, repeat step 3 for each additional audio function on the steering wheel.
2. If you come across a function in the chart that your steering wheel does not have, or you do not want to program, press and release the program button on the side of the interface to skip that function.
3. Once programming is completed, wait seven seconds. The LED will flash three times indicating end of programming.
4. Test the interface for proper functionality. Whenever a SWC button is pressed the LED on the interface should blink. If any function does not work, repeat the programming steps.

Optional Programming Order

	Alpine JVC Kenwood Clarion				Other ■	Pioneer Sony	Fusion
1	Volume +	Volume +	Volume +	Volume +	Volume +	Volume +	Volume +	Volume +
2	Volume -	Volume -	Volume -	Volume -	Volume -	Volume -	Volume -	Volume -
3	Mute	Mute	Mute	Mute	Mute	Mute	Mute	Mute
4	Preset +	Source	Source	Source	Preset +	Preset +	Preset +	Source
5	Preset -	Track +	Play	Search +	Preset -	Preset -	Preset -	Track +
6	Source	Track -	Track +	Search -	Source	Source	Source	Track -
7	Track +	Band / Disc +	Track -	Band	Track +	Track +	Track +	Audio
8	Track -	Preset / Disc -	Disc / FM +	Send / End	Track -	Track -	Track -	Power
9	Power	Select	Disc / AM -	Send	Band	Band	Band
10	Enter / Play	Attenuation Answer End			Answer 📋	Phone Menu	Reject Call / Source (Bluetooth equipped radios only)
11	Band / Program	Phone Receive	Voice Dial		End 📋	Answer Call	Answer / End Call
12	Receive	Phone Reject	On Hook		PTT 📋	End Call
13	End	Voice Dial	Off Hook			VR
14	VR	Power	Mute (Multimedia units only)
15			Preset +
- Advent, Boyo, Dual, Lightning Audio, Jensen, Rockford Fosgate & Visteon - Jensen & Advent ONLY

Testing and Verification

1. Turn the key to the ignition position. The LED on the interface will turn on & the +12v accessory wire will turn on.
2. Turn on the radio and check balance and fade.
3. Verify that all SWCs are functioning properly. The LED will flash whenever a SWC button is pressed, even if a function is not assigned to the button.
4. Verify that all data driven navigation outputs are functioning properly.
5. When using the VS41 to add left, right, front and rear cameras, be sure to trigger them with either the turn signals or the supplied switch and ensure proper operation.
6. The LED and radio will turn off when the ignition is turned off.