Step-by-step guide to replace and program the immobilizer control module on a Chery Tiggo 3 using LAUNCH X431. Includes troubleshooting tips and key programming steps.

Quick Answer: Replacing & Programming the Chery Tiggo 3 Immobilizer

Replacing the Immobilizer Control Module on a Chery Tiggo 3 requires a new or used module, a set of working keys, and a professional diagnostic tool like the LAUNCH X431. The process involves disconnecting the battery, removing the old module (usually under the dashboard), installing the new one, then using the X431 to perform an immobilizer reset and key programming. Without this final step, the engine will crank but not start. If you are using a used module, it must first be “virginized” — cleared of its previous vehicle data — before it can accept the new VIN and key codes.

Prerequisites and Preparation

Before touching any wiring or trim, gather the following tools and information:

Fully charged battery – voltage should be 12.5V or higher. Low power during programming can corrupt the module.
Original keys and VIN – you need at least one working key with a live transponder chip.
LAUNCH X431 – make sure it has the latest Chery software installed. Models like X431 PRO, V+, PAD V, or CR Series with the IMMO (Immobilizer) software pack are required.
Multimeter – to check power and ground at the module connector.
Plastic trim tools – for prying off panels without scratching them.

Locating the Immobilizer Control Module

On the Chery Tiggo 3 (model years 2005–2016), the immobilizer control module is commonly found in one of three places:

Behind the glove box
Under the steering column shroud
Integrated into the Body Control Module (BCM) or ECU

Look for a small black box with a large multi-pin connector (often 16–20 pins). It may be labeled “ISU” or “IMMO.” If you cannot find it, consult your service manual or search online for Chery Tiggo 3 immobilizer location photos.

Choosing the Right Replacement Module

Option	Pros	Cons	Notes
New OEM module	No need to virginize; plug-and-play with software linking	Expensive	Best for DIYers
Used module	Cheaper	Requires virginizing with X431; may not work if locked	Only try if you have a LAUNCH tool that can clear it

Important: The replacement module must have the exact OEM part number as your original. Check the sticker on the old module and match it when purchasing.

Step-by-Step: Physical Replacement

1. Safety and Preparation

Disconnect the negative battery terminal. Wait at least five minutes for capacitors in the airbag system and ECU to discharge. This prevents accidental shorts and protects the new module.

2. Removing the Old Module

Use plastic trim tools to pry off the panel covering the steering column or glove box.
Locate the immobilizer module. It is usually held by two or three screws (Phillips or Torx).
Disconnect the electrical connector by pinching the locking tab and pulling straight out.
Remove the screws and pull the module free.

3. Installing the New Module

Mount the new module in the same orientation. Tighten the screws securely but don’t overtighten (use hand-tight plus a quarter turn).
Reconnect the electrical harness. Make sure all pins are straight and fully seated. You should hear a click from the locking tab.
Temporarily reinstall the trim panels — you may need to remove them again if something doesn’t work after programming.

Step-by-Step: Programming with LAUNCH X431

This is the part where most DIYers run into trouble. Follow these steps exactly.

Connecting the Scanner

Plug the LAUNCH X431 into the OBD-II port (located under the driver’s side dashboard, near the hood release).
Turn the ignition ON (engine off). Do not start the engine.
On the X431, select Chery > Tiggo 3 > System Diagnosis.

Entering the Immobilizer System

From the system list, choose Immobilizer System or Anti-Theft System.
Before making any changes, read the fault codes (DTCs). Common codes you may see:
- B3054 – Key Not Programmed
- B3055 – IMMO Not Initialized

These codes confirm that the new module needs programming.

Performing the IMMO Learn Function

Navigate to Special Functions > IMMO Configuration. The next steps depend on whether your module is new or used.

Option A: New (Virgin) Module

Select “Initialize IMMO” or “Write VIN”.
Enter the vehicle’s 17-character VIN number exactly as shown on your registration or dashboard plate.
Confirm. The X431 will write the VIN into the module. This usually takes 30–60 seconds.

Option B: Used Module

Select “Clear IMMO” or “Unlock Module”.
The X431 will attempt to erase the previous vehicle’s data. Not all used modules can be virginized with this tool — if you get an error, you may need to contact a locksmith or replace with a new module.
If successful, the module will now behave like a virgin module. Proceed with Write VIN as in Option A.

Programming Keys (The “Key Learn” Step)

Go to Special Functions > Key Learning.
The X431 will prompt you to insert the first key into the ignition. Do so.
Follow the on-screen countdown. Typically, you have 5 seconds to turn the key from OFF to ON (do not start the engine).
The anti-theft light on the dashboard should go out or flash rapidly to confirm that the key was learned.
Do not remove the first key yet. Repeat steps 2–4 for all remaining keys (usually up to 4). If you remove a key before the process ends, you may lose the first programming.

Completion Test

Turn ignition OFF and wait 10 seconds.
Remove the first key, insert the second, turn to ON. The anti-theft light should go off immediately.
Attempt to start the engine. The engine should crank and fire normally. If it cranks but does not start, repeat the programming steps or check for additional error codes.

Troubleshooting Common Programming Failures

Even with a perfect procedure, issues can arise. Here are the most common problems and their solutions.

Error: “Communication Failure”

Possible causes: Blown fuse, bad ground at OBD port, or defective X431 cable.

Fix: Check the cabin fuse box for a fuse labeled “IMMO” or “ECU-B” (often 15A or 20A). Use a multimeter to verify 12V on OBD pin 16 and continuity to ground on pin 4. If the fuse is good, try a different X431 cable or restart the scanner.

Error: “Key Not Learned” / “Wrong Key”

Possible causes: Dead transponder chip in the key, incorrect timing, or missing driver’s door action.

Fix: Ensure the key’s internal battery is fresh (if it has a remote fob). Perform the key turn sequence quickly — the X431 expects the ON position within 5 seconds. Some Chery Tiggo 3 models require the driver’s door to be open during key learning. Try the procedure again with the door open.

Error: “Used Module – Security Lock”

Possible cause: The used module cannot be virginized with your X431 model.

Fix: Not all used Chery modules can be cleared. In this case, you have two options: purchase a new OEM module, or send the used module to a specialized locksmith who can force-unlock the EEPROM. The X431 Pro or V+ models have a higher success rate than standard versions.

Engine Starts but Dies After 2 Seconds

Cause: The immobilizer has not synced with the ECU. The ECU expects a valid IMMO signal, but the new module hasn’t communicated the key code to the ECM.

Fix: Look for a menu option called “ECU-IMMO Pairing” or “IMMO to ECM Reset” in the Special Functions section. Perform that function, then repeat the key learning process. This links the two computers so they recognize each other.

Topical Depth: Key Sub-Topics

The Role of the Transponder Chip

The LAUNCH X431 does not clone keys. It only programs the immobilizer module to accept the transponder IDs stored in your existing keys. If your key has a dead chip — no battery or broken coil — no programming will work. Common transponder chips used in Chery Tiggo 3 keys include PCF7935 (standard) and 4D60 (later models). You can test a key’s chip by holding it near a known-working immobilizer coil; if the dash light blinks, the chip is likely alive.

Difference Between Virginizing and Programming

Virginizing = wiping the old vehicle’s VIN, key IDs, and security data from a used module, returning it to factory-default state.
Programming = writing your vehicle’s VIN and learning your keys into the blank module.

Only professional-grade tools like the LAUNCH X431 PRO, V+, PAD V, or CR Series can reliably virginize Chery modules. The standard X431 Compact or entry-level models may not have this capability.

When to Replace vs. Repair

Replace the module if:

It has physical damage (water intrusion, cracked casing, burnt components).
The LAUNCH X431 cannot communicate with it at all (no response even after checking power and ground).

Consider repairing the module if:

The X431 communicates but fails to store keys.
You see common symptoms like intermittent start / no-start, but the module appears visually intact.

On older Chery Tiggo 3 modules, a faulty solder joint on the EEPROM chip is a known issue. Reflowing the solder can fix it. However, this requires steady hands and a soldering iron — not for beginners.

Frequently Asked Questions

Can I use any LAUNCH X431 model?

Yes, but only models that include the IMMO software pack — typically the X431 PRO, V+, PAD V, or CR Series. Basic entry-level diagnostic units without special functions cannot program the Immobilizer module. Check your tool’s specifications before starting.

Do I need the original keys?

Ideally, yes. The LAUNCH X431 can usually program up to 4 keys. If you have lost all keys, you must purchase new transponder keys (cut to match your locks) and then program them with the X431. Without at least one working key, you cannot initiate the key learning process.

How long does the process take?

The physical replacement takes 30–60 minutes. The programming via X431 takes 10–20 minutes if no errors occur. First-time users should budget a total of 2 hours to account for troubleshooting.

My engine doesn't crank at all after replacement. Is that normal?

Yes. The starter relay is often disabled by the immobilizer system after a module swap. Do not panic if the engine does not crank — focus on completing the key learning sequence. Once the keys are programmed, the starter will be re-enabled.

Will this work on a Chery Tiggo 3 Diesel vs. Petrol?

Yes, the procedure is identical. The immobilizer system is independent of the engine type. The same location, wiring, and LAUNCH X431 steps apply to both petrol and diesel variants.

What if my LAUNCH X431 shows “No Response” from the IMMO system?

First, check the IMMO module’s power and ground at the connector using a multimeter. If power (12V) and ground continuity are present, the module is likely faulty. If no power, check the related fuse — usually labeled “IMMO” or “ECU-B” in the under-dash fuse box. If the fuse is blown, replace it, then try again.

About the Author: Erwin Salarda is an Automotive Service Equipment Technician based in the Philippines, specializing in computerized automotive diagnostic equipment such as OBD scanners and wheel alignment systems. Since 2012, he has been actively providing technical support, equipment installation, troubleshooting, after-sales service, and hands-on training for automotive service equipment used by workshops and automotive professionals.

He has received specialized training from international suppliers and manufacturers, including Launch X431 in Shenzhen, China, Lawrence Engineering Company in Guangzhou, China, and 3Excel Wheel Alignment Company in Shenzhen, China. Through these trainings, he developed advanced expertise in automotive diagnostics, calibration, wheel alignment systems, and computerized automotive service technologies.

Erwin Salarda provides professional after-sales support and technical training for automotive diagnostic and wheel alignment equipment, helping clients maximize the performance and proper use of their tools and systems. His experience covers equipment setup, software updates, calibration procedures, troubleshooting, and operational guidance for automotive workshops and service centers.

With more than a decade of experience in the automotive equipment industry, Erwin Salarda continues to support automotive businesses by delivering reliable technical expertise and practical training solutions.

For inquiries and equipment purchases, please visit https://carlifterph.com/

Last Updated: June 15, 2026

Chery Tiggo 3 Immobilizer Replacement & Programming Guide