Trevor Ng
Removing the control unit from a car can be a tricky task, and the Volkswagen Golf Mk4 is no exception. The process can vary depending on the specific component being removed, but there are some general steps that can be followed. It is important to disconnect the battery before beginning any work, and to have the radio code to hand if necessary. The control unit is usually located under the steering wheel on the left side, and the first step is to remove the bolts from the plastic panels in this area. From here, different control units will require different steps, but it is important to be cautious when disconnecting electrical components and to always reassemble in the reverse order.
To remove the comfort body control module on VW Golf Mk4:
| Characteristics | Values |
|---|---|
| Step 1 | Disconnect the battery and have the radio code |
| Step 2 | Remove the three bolts from the plastic panels under the steering wheel |
| Step 3 | Use a flat-blade screwdriver to remove the fuse box cover |
| Step 4 | Remove the plastic faceplate surrounding the A/C control head |
| Step 5 | Remove the four Torx T20 screws |
| Step 6 | Take the CCM out but first disconnect the wiring harness from the comfort control module |
| Other steps | Remove the radio, the ashtray, the lower panel on the driver's side, and the glove box |
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What You'll Learn
Disconnect the battery
Disconnecting the battery is a crucial step when removing the control box from your MK4 Golf. Here is a detailed, step-by-step guide on how to safely disconnect the battery:
First and foremost, safety should be your top priority. Wear appropriate eye and hand protection to shield yourself from any potential hazards, such as spilled acid. Ensure that you have removed the key from the vehicle and stored it in a secure location.
The next step is to locate the battery. The MK4 Golf's battery is typically found in the engine compartment, covered by a larger cover that protects the top and sides of the battery. This cover has two circular plastic push-button retaining clips on either side. Push these clips in and gently lift the cover straight up to expose the battery.
You will now see the battery with two cables attached to its terminals: the positive and negative terminals. It is essential to disconnect the negative or ground strap first. Carefully detach the negative cable and ensure it is placed somewhere safe, away from the battery, to prevent any accidental contact.
Now, move on to the positive terminal. Disconnect the power strap from the main positive lead that connects to the fuse panel on top of the battery. This step grants you access to the fuses for various components, including the generator, interior relay, coolant fan, and control module.
After successfully disconnecting both the negative and positive terminals, you have completed the battery disconnection process. Remember to handle the battery with care and avoid any contact between the disconnected terminals to prevent short circuits or damage to sensitive electrical systems.
By following these detailed instructions, you can safely disconnect the battery from your MK4 Golf, allowing you to proceed with further maintenance or repairs.
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Remove the plastic faceplate
To remove the plastic faceplate of a Volkswagen Golf MK4, you will need a trim removal tool and a T20 Torx screwdriver.
First, disconnect the vehicle battery to avoid electrical shorts. Then, carefully pry off the plastic faceplate surrounding the control unit using the trim removal tool. Be gentle to prevent damage to the surrounding area.
Once the faceplate is removed, you will expose four Torx T20 screws. Remove these screws, and the faceplate should be loose. It may slide out, or you may need to remove the console, radio carrier, and possibly the glove box to fully remove the faceplate.
If you are removing the faceplate of the climate control unit, there will be a screw in each corner. Once these are removed, push the unit back into the dash and out of the way.
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Unscrew and remove the resistor
To remove the resistor on a Golf Mk4, you will first need to remove the front centre console and the glove box. You may need to remove a lower piece of insulation to access the resistor plate. The resistor plate is held in place by two Philips head screws. Use a screwdriver to unscrew the Philips head screws and remove the plate.
Now, carefully disconnect the harness from the blower motor resistor. You should be able to carefully slide the blower motor down and out of the housing. You may need to slightly bend the support bar to make room for the motor. Once you have done this, you can remove the motor from the vehicle.
If you are replacing the resistor, you will need to identify the correct part. You can do this by finding the OEM part number, which is usually located on the resistor. You can also call a VW dealership with your VIN number, and they can tell you the OEM part number.
Once you have the new resistor, simply follow the above steps in reverse to install it. Ensure that you reconnect the wiring harness and reinstall the ECU. Finally, reconnect the battery and reset the ECU.
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Disconnect electrical plugs
Disconnecting the electrical plugs is a crucial step in removing the HVAC dash control unit of a Golf MK4. Before beginning, it is important to disconnect the vehicle battery to avoid any electrical shorts.
To start, carefully pry off the trim panel surrounding the control unit. Utilise a plastic trim tool to prevent any damage to the trim. Once the trim panel is removed, locate the mounting screws securing the unit in place and unscrew them. Gently pull out the unit to access the wiring connectors.
At this point, you will need to disconnect all electrical plugs. Look for the release tabs on the plugs and press them to disconnect the plugs safely. Before proceeding further, take the time to inspect the connectors for any signs of corrosion or damage. This inspection is important for ensuring the proper functioning of the connectors and preventing any potential issues.
If everything appears to be in good condition, you can continue with the removal process. Reinstalling the unit or replacing it with a new one will depend on your specific needs and the condition of the connectors. Remember to reverse the steps for reassembly, ensuring that the functionality is tested before finalising any work.
Additionally, it is worth noting that removing the HVAC dash control unit is a significant task. It often requires the removal of several other components, including the console, radio centre trim, radio, and radio carrier. The process can take approximately three hours to complete, so it is important to plan accordingly and have the necessary tools and knowledge before beginning.
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Remove the CCM
To remove the CCM (Convenience Control Module) from a VW Golf Mk4, you must first disconnect the vehicle battery to avoid electrical shorts. The CCM is located under the steering wheel on the left side, behind the steering column.
Remove the plastic panels under the steering wheel by taking out the three bolts holding them in place. Then, use a flat-blade screwdriver to remove the fuse box cover. Disconnect the wiring harness from the comfort control module and then take out the CCM.
If you are replacing the CCM, you will need the coding value from the old one as the new one may come from a different specification car. The new unit will also need to have the remote control fob programmed in.
If you are removing the CCM to resolve an issue with the indicators staying on, you should also disconnect the battery and unbolt the ground, cleaning the connections to the metal and brass connectors. Remove the cowl and windshield wipers and clean the connections of any orange wires that are bolted to the body of the car.
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