BMW E70 Comfort Access Wiring Kit Guide

Retrofitting or repairing the Comfort Access system on your BMW E70 can significantly enhance convenience and usability. The Comfort Access feature allows for keyless entry and ignition, making it a sought-after addition for many BMW enthusiasts. In this guide, we’ll explore the steps to install or replace the front driver Comfort Access wiring adaptor kit, ensuring a seamless process.

What Is Comfort Access?

Comfort Access is BMW’s proprietary keyless entry and ignition system. It enables drivers to unlock and start their vehicle without removing the key fob from their pocket or bag. The system uses proximity sensors in the door handles, interior antennas, and an advanced control module to detect the presence of the key fob.

Tools and Materials Needed

Before starting, ensure you have the following:

• BMW E70-specific Comfort Access door handle with integrated sensors
• Front driver’s Comfort Access wiring adaptor kit
• Passive Go System (PGS) module (if required for retrofit)
• Wiring harness and connectors
• Trim removal tools
• Screwdrivers
• Multimeter
• Electrical tape and zip ties

Optional: BMW coding software and diagnostic tool for post-installation programming.

Step-by-Step Installation Guide

Step 1: Prepare Your Workspace

• Park your vehicle on a level surface and engage the parking brake.
• Disconnect the negative terminal of the battery to prevent electrical shorts or damage during installation.

Step 2: Remove the Door Panel

1. Use a trim removal tool to carefully pry off the interior trim of the driver’s door.
2. Unscrew and remove the screws securing the door panel.
3. Gently pull the panel away, disconnecting any electrical connectors attached to the panel, such as window controls and ambient lighting.

Step 3: Access the Existing Wiring and Door Handle

1. Locate the existing wiring connected to the door handle.
2. Disconnect the old handle’s wiring and unscrew the handle from its mounting position.

Step 4: Install the New Comfort Access Door Handle

1. Position the new Comfort Access door handle and secure it using the provided screws.
2. Connect the integrated sensor to the wiring adaptor kit.
3. Ensure the handle operates smoothly by testing its movement before reattaching the door panel.

Step 5: Route the Wiring Adaptor

1. Connect the wiring adaptor to the handle’s sensor and route the harness along the door’s internal wiring paths.
2. Secure the wiring using zip ties or clips to prevent it from interfering with the window mechanism or other moving parts.

Step 6: Connect to the Passive Go System (If Applicable)

1. Locate the Passive Go System (PGS) module in your vehicle, typically near the glove compartment or center console.
2. Connect the wiring harness to the PGS module following the wiring diagram provided with the kit.
3. Verify all connections are secure and properly insulated.

Step 7: Reassemble the Door Panel

1. Reattach any disconnected electrical components to the door panel.
2. Align the panel with the door frame and press it firmly into place.
3. Secure the panel with screws and reinstall the trim pieces.

Step 8: Reconnect the Battery and Test the System

1. Reconnect the negative terminal of the battery.
2. Test the Comfort Access system by attempting to lock and unlock the door using the new handle.
3. Check that the keyless ignition operates as expected.

Post-Installation Considerations

• System Coding: In some cases, the vehicle’s electronic control unit (ECU) will need to be coded to recognize the new Comfort Access components. Use BMW coding software or consult a professional technician.
• Testing and Troubleshooting: If the system does not function as expected, double-check all wiring connections and ensure the PGS module is properly integrated.

Why Choose a Comfort Access Upgrade?

Adding or repairing the Comfort Access system on your BMW E70 enhances convenience and adds modern functionality. This feature is particularly valuable for daily drivers, providing a seamless experience every time you use your vehicle.

Conclusion

Retrofitting or repairing the Comfort Access system on your BMW E70 can greatly improve the functionality and ease of use of your vehicle. With the right tools, components, and a bit of patience, you can successfully install the front driver’s Comfort Access wiring adaptor kit. Whether you’re updating an older system or adding a new feature, following this guide ensures a smooth process. For those unsure about certain steps, professional assistance is always a recommended option.

Frequently Asked Questions (FAQs)

1. Can I install the Comfort Access system myself? Yes, with the right tools and this guide, you can install the system yourself. However, if you’re unfamiliar with car electronics, professional help is recommended.

2. Do I need to code my BMW after installing the Comfort Access kit? In most cases, coding is necessary for the vehicle’s ECU to recognize the new components. This can be done using BMW-specific diagnostic tools or by a professional.

3. What if the system doesn’t work after installation? Double-check all wiring connections and ensure the Passive Go System is properly integrated. If issues persist, consult a professional or use diagnostic tools to identify the problem.

4. Is this retrofit compatible with all BMW E70 models? The Comfort Access kit is generally compatible with most E70 models, but it’s essential to verify compatibility with your vehicle’s production year and specifications.

5. How long does the installation process take? The installation typically takes 2-4 hours, depending on your experience level and whether additional coding is required.