Mercedes Head unit Anti-Theft PIN Code & Unlock | Online Remote Service

Mercedes Head unit Anti-Theft PIN Code & Unlock Online Service through OBD

Installed a used or replacement Mercedes headunit and now see Anti-Theft Protection Active, fault B156100 / 9561, or a locked headunit? Don't have the headunit 14-character serial number or aren't sure how to enter the PIN? We can remotely read the required headunit information and assist with unlocking through OBD using supported Mercedes diagnostic tools or interfaces. No need to remove it from the car! Connect a compatible diagnostic interface to the vehicle's OBD port and your Windows laptop. We can then help read the required headunit information, verify the serial number, and perform the applicable Anti-Theft PIN unlock procedure. You Connect → We Diagnose → Get PIN from Manufacturer→ Headunit Unlock

Mercedes Head unit Unlock Remote Service through OBD

$250

100% Guaranteed to Work or Your Money Back

Session add-ons

A headunit commonly enters Anti-Theft mode after being installed in another vehicle. The headunit detects that the vehicle VIN differs from the VIN previously associated with it and requires the applicable Anti-Theft PIN.

B156100 / 9561 indicates: “The PIN for the anti-theft protection is incorrect or absent.” It can appear when the replacement head unit has not been correctly activated for the vehicle.

The PIN is looked up using the headunit's exact 14-character serial number. ARMHEX can perform the PIN lookup from the OEM and unlock it remotely if it is not a stolen component.

The serial number can be read from the physical headunit label or electronically through the vehicle's diagnostic connection.

Yes. We can remotely assist with reading the connected ECU/headunit information, including the variant, software, hardware and serial number.

No. The code is not generated or calculated. We search and get it from the OEM corresponding to the supplied head unit serial number.

No. If the head unit has been reported stolen, a PIN cannot be obtained for it.

No. For supported head units, the system can be identified through the diagnostic connection.

Supported systems include HU4, HU4.5, HU5, HU5S1, HU5ES2, HU5.5, HU6, HU7 and Gen20x.

Yes. For supported systems, ARMHEX can assist with the Anti-Theft unlock procedure remotely through the OBD.

Depending on the system and procedure, use a Mercedes diagnostic interface like C4, C6, or a compatible OBD diagnostic interface.

After the procedure, the headunit's Anti-Theft status can be checked to confirm that it is activated and unlocked for the vehicle.

Not necessarily. If the head unit accepted the PIN, the PIN is correct. Anti-Theft returning after a restart can indicate a communication problem between the head unit and EIS/EZS.

First, verify that the PIN corresponds to the exact 14-character serial number of the connected head unit. Then verify the diagnostic connection and check the Anti-Theft status again.

Mercedes Head unit Anti-Theft PIN Code & Unlock Online Service through OBD

Service Overview

Perfect for

How to Unlock Mercedes Head unit Antitheft Mode

Connect to ARMHEX

Buy the Service

Install Remote Software

Start Remote Session

Head Unit Is Unlocked

What Tools do You Need?

Typical Service Time

We Help Automotive Professionals Complete Advanced Programming with Confidence

ASE Certified Engineers

OEM Software

BBB Accredited Business

100% Money-Back Warrantee

Get Your Mercedes Head Unit Unlocked

Advanced Multi-Brand Programming: Bring OEM-Level Programming to Your Workshop

Frequently Asked Questions

Related BMW Remote Services

BMW 6HP EGS ISN Reset Remote Service

BMW 7DCT300 ISN Reset Remote Service

BMW 8HP EGS ISN Reset Remote Service

BMW 8HP EGS ISN Reset Remote Service

BMW 8HP S18A EGS7 ISN Reset Remote Service

BMW 8HP45 EGS ISN Reset Remote Service for E Series