Mercedes-Benz C-Class C300/C400 W205 How To Replace Front Bumper

Mercedes-Benz C-Class C300/C400 W205 How To Replace Front Bumper

As delicate it is in class, style, and roaring on the track, the Mercedes-Benz C-Class looks exactly the part for an entertaining weekend. But this already intimidating look can be taken a step further. So whether you plan to install a new diamond sports grille or simply replace the front bumper on your Mercedes-Benz C-Class w205, the procedure must be done right and true. Read on to learn how. Disconnect the negative terminal (black lead) of the battery. 5 in Figure 1). Use a trim removal tool to unsnap the rivets, and set them aside. With a ratchet and socket, remove a bolt on each side bracket of the front engine compartment panel. Pull back on the inner fender liner of each wheel well. There is a bracket secured by two bolts on each side; remove them as well. Then, unplug the electrical connector located inside the right inner fender. Unplug one more electrical connector on the top center of the bumper. Remove the two remaining bolts on top of the bumper right above the headlights. Check that all bolts and connectors are removed as well as detached before removing the bumper. 13 in Figure 5). Slide the bumper out beginning with the center and working your way to the sides. Carefully set it aside, so as not to scrape it. Whether replacing the front bumper or installing a new grille to the stock bumper, reassemble the front end in reverse order to the steps above. Line up the sides and top of the front bumper. Slide the bumper onto the front end, and latch the top. Bolt the bumper's top end to the frame. Reconnect all wire harnesses. Bolt the side and top bumper brackets. Snap on the expansion rivets.

The relay control coils look a little different that those in Figure 3. A resister is shown (zagged line) and is used to prevent voltage spikes from reaching the PCM when the relay is operated. NOTE: This circuit operates on 12-volts. However, when the engine is running the operating voltage is 14-volts, or charging voltage provided by the alternator. The three cooling fan relays determine the power and ground paths to the cooling fans. To run both cooling fans in the high-speed mode, the PCM grounds both terminals 42 and 33 (low and high-speed cooling fan relay controls). 3鈥檚 control coil at terminal B4. This turns the relay on because terminal C6 has power all the time from the 10 am fuse. The RED wire at terminal C4 of the relay is connected to the 40 amp cooling fan fuse and with the relay on connects to terminal B6 within the relay.

The WHT wire from the relay (terminal B6) is connected to the right cooling fan and provides power. The right cooling fan has a constant ground on the BLK wire. With 14 volts (engine running) on the WHT wire and a ground on the BLK wire the right cooling fan runs at high-speed. 1. On the same relay, terminal C3 gets power from the 10a fuse on the ORN wire. With power at C3 and a ground a B1 the relay operates and connects relay terminals B3 to C1 providing power to the left cooling fan on the LT BLU wire. 2 is turned on by the PCM high-speed relay control ground at relay terminal C10 on the DK BLU wire. 2 connects the GRY wire from the left cooling fan to the BLK wire (no terminal number listed). The BLK wire provides the ground for the left cooling fan and it runs at high-speed.

We have walked through the answers and analysis to questions 1 and 2. Finding the answer to question 3 is up to you. Question 3. Trace the path that provides power to each cooling fan in the low-speed mode. Identify the wire colors, relays, and relay terminals that are powered during fan operation. Trace the ground return path for the relays and cooling fans鈥攊dentify the wire colors and relay terminals used in the ground side of the circuit. To understand the low-speed fan operation a quick review of electrical theory will help. In a parallel circuit (the most common type used in automobiles) all load devices operate on system voltage. For example, when the cooling fans operate in the high-speed mode each has 14v from the 40a fuse. A series circuit operates differently. With two load devices wired in series, they divide the available voltage between them. In the low-speed mode the cooling fans are wired in series and each fan runs on 7 volts 鈥?one half of the system voltage of 14 volts. 1. With a ground at relay terminal B1 (DK GRN wire), and power at C3 the relay鈥檚 control coil connects the high-amperage contacts (terminals B3 and C1). This connects power (14-volts) from the 40a fuse (RED wire) to the LT BLU wire going to the left cooling fan. 2 is not triggered by the PCM in the low speed mode and the C8 to B9 relay connection is normally closed. 2 (B9) goes to the right cooling fan providing 7 volts (one half of 14 volts) to power the fan. 3 is not operated in low-speed fan operation. The BLK wire from the right fan provides the ground return for BOTH fans. Because the fans are wired in series, they divide system voltage (14 volts) equally between them and both operate on 7 volts causing them to run at low speed.

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