Aussie MAX-PLUS®
Plug-In Keyless Entry - Install Instructions
With Remote Entry, Factory Alarm Activation, Parking light Confirmation & Sound Chirp Option
Mercedes Benz w126 chassis >>>>> SE, SD, SEL, SDL, SEC
Picture # 1 Picture # 2 Picture # 3
THE BASICS You will
- Disconnect a round plug from the trunk lock actuator and connect it to the keyless system. (Picture # 3)
- Connect a Negative (-) ground wire to an existing screw in the chassis (car body) for power (Picture # 5)
- Connect a paddle plug to the Trunk Light to give the unit 12 volts power (Picture # 8)
- If you choose, solder or wire-tap ONE wire to the passenger side taillight plug to flash the parking lights (Picture # 6). Not necessary to lock the car or control the factory alarm. (Only the passenger side parking lights flash on w126 and r107 models)
ACTUALLY DOING IT
(If you purchased the Aussie ASSEMBLE YOURSELF version, first read the section on MAX-PLUS assembly).
To install the keyless control box, your Trunk Light must be working, and you will need the following tools.
- 8mm wrench or pliers are necessary to remove two screws on the lock actuator.
- Small flat head screwdriver (Jewelers type), to remove plastic grommets in trunk/tailgate.
- Long-Nose pliers and Flash Light are handy, but not necessary.
- A Flat head screw driver is handy, but not necessary.
FIRSTLY, Disconnect the car battery, or remove fuse # 15 which controls the central locking.
You will be installing the keyless control box in the trunk, under the rear sill, in the small cavity below the rear window brake light assembly. When mounted here, the range of the remote fobs is approx 200 feet. (Picture # 1)
Along the back wall of your trunk, you will find a piece of Mercedes carpet which is attached to the rear wall of the trunk on either side by two round black plastic clips. The clips are actually expansion plugs. Remove the center, and then remove the expansion sleeve. Un-clip the carpet from these clips, and lift the carpet up to reveal the trunk lock, which is in the center, and the vacuum actuator, which is located off center to the left of the lock. (Picture # 2).
The actuator is a black box with a metal pole sticking into it. If you use a flashlight, you will see a yellow vacuum line connected to the top of the actuator, and a round plastic wire connector, plugged into the bottom. This round electrical connector is what you need to un-plug and re-plug the Keyless entry control box into. (Picture # 3 ). (On some later model SEL’s; this carpet cover in the trunk may have been replaced by a hard plastic cover, which you will need to remove).
Picture # 4 Picture # 5 Picture # 6
Start by removing the two 8 mm screws holding the lock actuator in place, so the actuator is loose and free to move around.
On all the w126 models, although the round plug you will be removing is visible, it is not accessible. On these model cars, you will need to dismantle the vacuum actuator in order to gain access to the round electrical plug.
The metal shaft that is connected to the vacuum actuator appears to have a thread on it, but it is NOT a thread. It is actually a compression fitting.
With a marking pen, mark where the metal shaft connects to the fluted plastic end of the vacuum actuator. Next, hold the plastic fluted end of the vacuum actuator and pull firmly on the metal shaft. The shaft will extract from the vacuum actuator, being held in place by a plastic compression grommet. (Picture # 4)
Now the actuator is disconnected from the metal shaft, you can remove the round plastic wiring plug (usually clear in color), from the trunk lock actuator. It is jammed in tight, and hard to get to. Also, there is a plastic security clip on the side of the actuator which holds the round wiring plug in place. You need to bend this clip back while trying to separate the round wire plug from the lock actuator. Pull on the plastic body of the plug. Do not pull by the wires, as you may break them. (If you break the security clip, it’s OK). Using long-nose pliers will make this process easier. Also, you can use a screwdriver as a lever to bend back the plastic security clip, which holds the round plug in place. (On newer models, there is no security clip and the plug is a black right angle 90-degree plug, as illustrated.)
Once you have separated the round electrical connector, extract this wire and round connector out of the back trunk wall, and redirect it under the carpet side lining so the plug and cable are sitting up behind the trunk spring / hinge mechanism on the passenger side. (Picture # 5)
IMPORTANT: Make sure to line up the Multi-Pin connector on the wire harness as you plug it into the control box.
Position the Max-Plus keyless control box, with multi-pin cable attached inside the trunk, in the cavity underneath the Rear Window Brake Light. Place the multi-pin connector in first, and the antenna sticking outwards. (You may need to use a piece of dry kitchen sponge to jam the control box in nice and tight in the cavity to prevent it from moving or rattling) (Picture #1)
From the Keyless control box, run the thin BLACK negative, the ROUND CONNECTOR and the one of the PINK / COPPER colored wires in the direction of the trunk hinge on the passenger side. Connect the round connector to the round connector from the central locking (Pic #5).
IMPORTANT: Make sure you line the two plugs up correctly as you connect it. There are two flat surfaces inside the plugs you need to line up. (See illustration on next page).
Pictures # 7 Picture # 8 Picture # 9
Connect the BLACK negative wire to one of the two fuel tank door actuator screws directly under the hinge spring.(Pict# 5)
Continue running the PINK /ORANGE wire behind the passenger side trunk carpet side lining to the taillight connector. (Connect this wire to Pin # 6 of the connector, described in Parking Light section) (Picture # 6)
Run the RED POWER wire wire inside the tube of the Drivers Side trunk hinge, and run it through the cavitys in the trunk lid to the trunk light. (Picture # 7). Cut the wire to the correct length and crimp on the end with pliers, the paddle connector.
Take the paddle doubler provided, and place it on the trunk light fixture terminal that has the POSITIVE cable (Red Strip). Now re-connect the POSITIVE wire (Red Stripe) from the car chassis/light fixture to the paddle doubler together with the RED wire from the keyless control box. (Picture # 8) Make sure the wires and paddle connectors do not protrude or sit to high, because if they touch the car chassis it will short out and blow your fuses.
Now neaten up all the cables. In the rear sill first aid compartment on the passenger side, you will find ventilation holes in all four corners. From inside the car cabin, poke a plastic wire-tie in through the two front most holes. From inside the trunk, wrap those wire ties around the cables coming from the Keyless control box, and poke the wire-tie back up through the ventilation holes and back into the head of the wire-tie.. (Picture #9).
Hide the PINK / ORANGE wire going to the passenger side taillight behind the trunk carpeted side panel.
Take the thick BLACK ANTENNA wire and poke it upwards through the cavity above where the keyless control box is mounted, so the antenna is above the sheet metal of the rear ledge / sill. Try keeping the wire straight by sliding it under the figerglass lining of the rear ledge, or if this doesn't work, you may need to form a large circle of the antenna wire to fit it in the cavity. The more antenna you can get inside the cabin of the car and above the sheet metal, will produce a longer range on the remotes.
Now test the central locking is working. (You can check your alarm later, but it is also working now !)
Re-connect the car battery, or re-install fuse # C and close the doors, trunk and hood.
Push the Lock button on the remote control (Button # 1), and the car will centrally lock. Button # 2 will Un-Lock the car.
FINDER FUNCTION: By pushing the FINDER button #3 on the remote, the parking lights will illuminate and flash for 30 seconds to assist finding the car in a crowded parking lot at night without disabling the factory alarm or un-locking the car.
TRUNK-POP FUNCTION: The BLUE / BLACK Stripe wire from the keyless control box is for a possible TRUNK-POP function. To operate, push the Un-lock button # 2 for three seconds. However Mercedes trunks don’t pop, so there’s no reason to install it, but if you have another use for it, you could use it. The BLUE wire sends a negative (-) control signal. You must use an external12-Volt relay.
USING YOUR CAR KEYS: If you LOCK or UN-LOCK the car with your mechanical key, you may have to push the UN-LOCK and then the LOCK buttons on the keyless remote to cycle the system, as it sometimes gets confused if you use the mechanical key.
If you ever have a problem with the system, remove the fuse “C” for 10 seconds and then re-install, or disconnect your car battery and re-connect. This will re-initiate the vacuum pump and keyless.
PROGARMMING ADDITIONAL REMOTES: Up to 6 remotes can be programmed on the Aussie Max-Plus. To program additional remotes; open the Keyless control box by removing the four Philips head screws. On the PC board inside, move the BLACK jumper plug from it’s current position (P2) to the Programming Position (P1). (See illustration). The parking lights will flash once to indicate it is learning. Push the LOCK button on the remote control, and the remote is programmed. Re-position the Black jumper plug to its original position when done. Repeat the same procedure for each additional remote to be programmed.
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