How to

How to use forced activations for faster fault finding

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Forced activations are a powerful but often underused diagnostic feature. They allow technicians to command components directly, helping to confirm whether systems, wiring and actuators are functioning correctly without relying solely on fault codes.

In this video, Phil demonstrates how to use forced activations on an MG ZS, using two real-word diagnostic scenarios. You’ll learn how to:

Use the Delphi DS Diagnostic Tool to access forced activations
Navigate Body Control Module and Engine Control Module activation menus
Test components such as rear wipers and coolant fans without dismantling parts
Quickly rule out electrical faults before moving on to mechanical checks

Diagnostics & Test Equipment How to Technicians 1 min read

What are forced activations used for?

Forced activations allow technicians to command components on or off directly though the diagnostic tool. This makes it possible to confirm if a system, actuator or circuit is responding correctly, helping to pinpoint whether a fault is electrical, wiring-related, or elsewhere.

Why are forced activations useful for faster fault finding?

They allow immediate testing without waiting for specific vehicle conditions, such as engine temperature or vehicle speed. This helps reduce diagnostic time and prevents unnecessary removal or replacement of parts.

Is battery support required when using forced activations?

Yes. Using a battery support unit helps maintain a stable voltage during diagnostics, ensuring reliable communication with control modules and preventing interruptions while activations are being carried out.