SKSNG205D4 Remote Start Installation Manual for 2015-2018 C Class & 2016-2019 GLC

Open center console

Remove silver trim in front of center console

Remove 2X T-20 screws in front of center console

Un-clip and set aside console panel below radio screen

Un-screw 2X T-20 screws on brackets in upper corners of radio

Screws do not need to be fully removed. When the screws are un-screwed enough, the brackets will release

Once brackets are released, pull out and set aside radio deck

On the left side of the radio cavity there is a plastic grill. A small piece of plastic must be cut out of this grill to create a large enough opening for the EIS (electronic ignition switch) to be removed through

Pull out push to start button and set aside (the push button is a cap that can be removed)

Un-clip the EIS (electronic ignition switch) from the dash and pull through radio cavity

Note: there are tabs on the top and bottom of the EIS. The EIS un-clips from the dash by squeezing those tabs toward the center of the EIS and pulling towards the front of the vehicle

Un-latch 40 pin connector plugged into back of EIS by pressing locking tab above grey latch and pushing latch up

Un-plug connector from EIS

This is the harness that will be used to install the T-harness of the SKSNG205D4 to the EIS

A jumper must be installed on the ignition switch in order to complete this installation. The jumper is a pin and a wire that is soldered on to the board of the switch (see pictures for solder points for pin and wire). To the left there are pictures of the modification.

Detailed installation instructions for EIS jumper and pin installation here: SKSNG205D4 & SKSNG222D4 EIS Jumper & Pin Installation Instructions

To properly install the EIS jumper, you MUST have a temperature controlled soldering iron.

If you would like to have the jumper installed by Mid City, you can send it to us and we will perform the modification for free (with the purchase of an SKSNG205D4). Please call 312-421-1114 ext. 1 or email sales@midcityengineering.com

The 40 pin connector that was removed from the EIS in step 7 has a white shell and 2X 20 pin inserts (black and grey). The 20 pin inserts need to be removed. The SKSNG205D4 comes with a 40 pin black shell. The 20 pin inserts will be inserted into the provided black 40 pin shell

Some OEM connectors will not this connector swap. If the plugs match, you can move on to step 12

Using a pick tool, carefully remove the grey and black 20 pin insert connectors from the white 40 pin factory connector

Insert the grey and black 20 pin insert connectors into the provided black 40 pin shell

Be sure to place the 20 pin inserts into the provided connector in the same orientation as they were in the factory connector. It is advised that you take a picture of the factory connector before you remove the shell so that you can check the orientation after you have replaced the shell

One side of the T-harness provided with the SKSNG205D4 has 2X 20 pin inserts (black and grey) that look like the factory inserts used in step 9. The connectors are to be inserted into the white 40 pin shell that was removed from the factory harnessing in step 9

Insert the grey 20 pin connector from the T-harness into the white 40 pin factory shell - being sure to insert in the same side as the factory connector (compare to black 40 pin shell from previous step)

Insert the black 20 pin connector from the T-harness into the white 40 pin factory shell being sure to insert in the same side as the factory connector (compare to black 40 pin shell from previous step)

Route EIS back through left side of radio cavity

Clip EIS back into dash

Plug 40 pin white shell (now installed on T-harness) into back of EIS where it was removed previously and secure latch

Be sure to check that connector is fully plugged in and latched to EIS

BEFORE MOVING TO NEXT STEP, MAKE SURE THAT MAIN CONNECTOR OF T-HARNESS IS CONNECTED TO SKSNG205D4 MODULE

The factory (chassis side) harnessing with the factory grey and black 20 pin inserts should now be inserted in the provided black 40 pin shell

DO NOT MAKE THIS CONNECTION UNTIL THE WHITE 40 PIN SHELL IS CONNECTED TO THE BACK OF THE EIS AND SKSNG205D4 MODULE IS PLUGGED INTO MAIN HARNESS

Connect 40 pin shell and chassis side harnessing into black 40 pin connector on SKSNG205D4 T-harness

There are 2X connections that need to be made under the passenger side floor (front) at 2X different CAN distribution blocks (rows of connectors).

Remove plastic sill cover along door sill plate and set aside

Pull back carpet in front of seat to access under floor area

Open the black panel beneath the carpet along the door sill

Locate distribution block with blue and blue/white factory wires

Un-clip the block so that plugs can be access easily

The SKSNG205D4 has a small T-harness with blue and blue/white wires and white plugs. This T-harness will be used to make the connections at this block

Plug the plug end of the T-harness (side without the exposed pins) into any empty spot on the block with blue and blue/white wires

There is a test using the LEDs on the SKSNG205D4 module that will instruct as to which factory plug will be removed from the block and connected to the other end of the blue and blue/white T-harness. To begin this test, you must have the module and T-harness installed behind the EIS and the key inserted but not turned

Insert key into EIS and do not turn

Once key is inserted into EIS, the yellow LED on the SKSNG205D4 module should flash. Confirm the yellow LED is flashing and you are ready to begin the test.

To find which CAN plug should be removed from the block and connected to the other end of the blue and blue/white T-harness, you will remove each plug one at a time and connect to the T-harness.

When a plug is removed, the yellow LED will turn off- and when the correct plug is connected to the harness, the green LED on the SKSNG205D4 module will turn on and begin to flash

Using a pick tool, unlock the tab on the side of the first connector in the block and remove from block. When a connector is removed from the block, the yellow LED on the module will turn off

Connect the removed factory connector to the T-harness (the side with the exposed pins)- being sure that the plugs are connected in the same orientation and the factory blue and blue/white wires are going to the blue and blue/white wires of the T-harness

After plug is connected to the T-harness, check the LEDs on the module. If the LEDs stay off, move on to the next plug

It may take up to 10 seconds for the LED to respond to each newly connected plug

Continue test until you find the plug that makes the green light on the SKSNG205D4 module turn on

Once you have found the correct plug, leave it connected to the T-harness.

Tape connection made between factory plug from block and T-harness connector and find secure location in wire channel along door sill for those connectors

Re-install distribution block into location in wire channel

The SKSNG205D4 comes with a Keyless Go extension cable (20 foot brown and brown/red harness). The white connector plugs into 2 pin connector on SKSNG205D4 module labeled 'KG.' The other end of the harness is connected at distribution block with brown and brown/red wires on passenger side floor, along door sill, towards the kick panel.

Connection at the distribution block involves locating the correct plug using a short test, de-pinning the factory 2 pin connector and pinning the factory brown and brown/red wires into the provided adapter plug. The adapter plug plugs into the provided KG harness and allows the factory wires to bypass the block and connect to SKSNG205D4 module

The distribution block with brown and brown/red wires is located in an access panel along the door sill, towards front of the vehicle in relation to the block used in the previous steps

Open access panel and locate distribution block with brown and brown/red wires along door sill, towards the kick

Un-clip the block so that the wires can be accessed

To find the correct KG plug from the distribution block, you will use the LEDs on the SKSNG205D4 module.

Insert key in ignition and turn to first position (ACC)

Once in ACC, the yellow LED on the SKSNG205D4 module will flash

Once the yellow LED on the module is flashing, you are in the KG test

To find the KG CAN plug, you will un-plug the connectors from the distribution block with brown and brown/red wires one at a time and observing the LED on the SKSNG205D4 module. When the KG connector is un-plugged, the yellow LED on the SKSNG205D4 module will shut off.

There may be two connectors in the block that cause the yellow LED to turn off. Please test each plug in the block. If there are 2 plugs that cause the yellow LED to shut off, you can confirm you have the correct plug by checking to see if A) when un-plugged, the radio can still be turned on and B) the push to start button will not start vehicle

Using a pick tool, disconnect one factory connector from the distribution block with brown and brown/red wires

After un-plugging first connector, observe behavior of yellow LED on the SKSNG205D4 module.

If, after un-plugging the connector, the green LED shuts off- move on to next step. If the yellow LED does not shut off, plug that connector back into the block and remove the next plug from the block- repeat until you find the plug that, when un-plugged, causes the yellow LED on the SKSNG205D4 module to shut off

It may take up to 10 seconds for the LED to respond to each newly connected plug

When the KG connector is found (the one which, when un-plugged, causes the yellow LED on the SKSNG205D4 module to shut off)- move on to the next step

Turn key to off position and remove from ignition before making connections in next step

Once the KG plug is located (from the test in the previous step), remove key. The factory brown and brown/red wires from that block will be de-pinned from the factory connector and pinned into the adapter plug in the end of the provided KG harness (being sure to connect brown to brown and brown/red to brown/red)- factory wires will bypass block

Using a pick tool, carefully de-pin factory wires from KG plug one at a time

Plug empty factory plug back into block so that the original plug can be used if system is un-installed

Pin factory brown/red wire into pin position 1 of adapter plug that is plugged into the end of the provided KG harness

Pin factory brown wire into pin position 2 of provided adapter plug

When pinning factory wires into adapter plug, note their position in relation to the provided KG harness. When the adapter plug is plugged into the KG harness, the factory brown wire will connect to brown wire of the KG harness and the factory brown/red wire will connect to the brown/red wire of KG harness

Connect adapter plug with factory wires pinned in the correct positions to the end of the provided KG harness

After harness is connected, the factory wires will be bypassing the block and instead going into provided KG harness (brown connected to brown and brown/red connected to brown/red)

Run KG harness to SKSNG205D4 module

Connect 2 pin white plug from KG harness to 2 pin white plug on SKSNG205D4 module labeled 'KG' (next to 20 pin main harness plug)

Once the KG harness is connected to the SKSNG205D4 module, you should have the factory wires that were located using the KG test bypassing the block and running through the KG harness and into the SKSNG205D4 module. You can check this connection and confirm that the correct wires are connected by performing a quick test

Insert key in ignition and turn to the first position

Observe LEDs on SKSNG205D4 module. With the key in the first position and the KG harness connected to the factory wires, the green LED on the module should flash.

If the green LED is flashing, remove key from ignition and move onto the next step. If the green LED is not flashing, remove key from ignition and return to previous steps to check KG connection and/or redo KG finder test

An extra key needs to be installed with the system. The box for the extra key is included with every SKSNG205D4

Inside the provided key box is a battery emulator. The battery will be removed from the extra key being used for the installation and the emulator is inserted in place of the battery.

Remove key battery

Insert battery emulator in place of battery in the key with arrow on emulator labelled 'FRONT OF KEY' pointing towards the TIP end of the key

Connect white plug from provided key box to 2 pin white plug labeled 'KEY' on SKSNG205D4 module

Insert push button back into ignition

Be sure that hood is closed and the vehicle is in a safe place to start. Vehicle should not remote start if the hood is open (parking lights will flash 7X)

The remote start will not work unless the push button is in the ignition switch

From outside vehicle, press PANIC button on key fob 1X (short press)

If the OEM key fob does not have a PANIC button, the SKSNG205D4 will automatically revert to a 'LOCK-UNLOCK-LOCK' remote start sequence

If vehicle does not remote start, the parking lights and yellow LED on the module should flash a series of times. The # of flashes corresponds to a failure code. The most common failure code is 9 flashes.

If you see 9 flash error code, attempt remote start while sitting inside vehicle with key. If the vehicle remote starts while sitting inside the vehicle with the key, check key box connection and operation of extra key installed in box. If vehicle does not remote start while sitting inside with key, check KG connection and EIS jumper modification

While vehicle is remote started, test key takeover by entering vehicle with the key on you (for vehicles with Keyless Go locking and unlocking from door handle, this feature will work during remote start- if lock/unlock does not work from the door handle, check KG connections)

Once inside vehicle, press the brake pedal and the push to start button at the same time

If the key is present, the parking lights will flash 3X to confirm key takeover

Once key takeover is done, confirm that vehicle will shift into gear

Mount key box and module in secure location in radio cavity

Make sure that all modules and harnessing are mounted away from any heat sources or moving parts

Re-install radio deck and console panel

Re-assemble passenger side floor