Bi-directional control lets a diagnostic tool command components on the vehicle so a South African workshop can test actuators and modules before replacing parts.
Reading fault codes tells you what the vehicle reports. Bi-directional tests (also called active tests) let the tool send commands to components such as fuel injectors, cooling fans, ABS pumps, door locks or throttle actuators so you can prove whether the part responds.
When a workshop needs bi-directional tests
Most repair jobs benefit from active testing. If a fan does not run, a window does not move, or an ABS pump stays silent, commanding the component from the tool confirms whether the module, wiring or the part itself is at fault. This saves time and avoids replacing good parts.
What entry tools can and cannot do
The CRP123X Plus and CRP129X Plus read every system and clear codes. They do not support bi-directional control or active tests. For workshops that only diagnose and service, they are sufficient. Once you need to make components act, you step up.
Recommended LAUNCH tools
Bi-directional tests start with the CRP919X / CRP919X-E. Professional X431 tablets (PROS Elite, PRO3 APEX, V+ 5.0 PRO3) add faster processing, larger screens, CAN FD and DoIP support, and more advanced special functions on top of active testing.
Practical examples on South African vehicles
Common uses include commanding the radiator fan on a bakkie, testing the ABS hydraulic pump, cycling door locks, activating fuel injectors or solenoids, and checking throttle or EGR response. On newer vehicles the same principle applies once the correct software is loaded.
Local support and demonstration
Launch Dealer SA technicians in Midrand can demonstrate bi-directional tests on a live vehicle before you buy. WhatsApp support is available after the sale for questions about specific models and functions.
Visit the Midrand showroom or contact the team to see which tool matches the jobs you do every day.
Questions we get asked
What is bi-directional control on a diagnostic tool?
Bi-directional control lets the tool send commands to vehicle components so you can test actuators and modules directly instead of only reading fault codes.
Which LAUNCH tools support bi-directional tests?
The CRP919X and CRP919X-E support bi-directional tests. Professional X431 tablets such as the PROS Elite, PRO3 APEX and V+ 5.0 also include active testing plus advanced functions.
Can the CRP129X Plus do active tests?
No. The CRP123X Plus and CRP129X Plus diagnose every system and clear codes but do not support bi-directional control.
Why do workshops need active tests?
Active tests confirm whether a component responds before you replace it, reducing unnecessary parts and speeding up diagnosis on the ramp.
Can I see bi-directional tests before buying?
Yes. Visit the Launch Dealer SA showroom at Midrand Motor City and the technicians will demonstrate active tests on a compatible tool.
