How to Test a Wireless Control Module

A wireless module is an electronic function that provides remote or radio frequency-based access facilities to a user. Inspection of the functionality of such a system is important to secure uninterrupted use.

 The latest versions of wireless modules contain the following components.

  • The central hub of the wireless control module
  • Ignition Key
  • Combination Meters
  • Sensor for ABS or ASC-ECU
  • Engine and throttle control module
  • Tyre pressure meter system

 Professionals recommend inspecting the functionality of WCM units under two cases.

  1. If the WCM indicates functional issues.
  2. In case of replacement of WCM unit.

When treating an indicated functional issue of a WCM unit the ideal way to start the test is by conducting an observational study. For the case of WCM replacement, there is a pre-defined procedure to follow.

General Requirement of Tools

To test a wireless control module scan tool, vehicle communication interface, data link connector, and access to the main wire harness are required.

How to Test Wireless Control Module?

There is a common process that is applicable to every testing method and each specific testing method is an extension of the common process. Following are the steps of the common process

1.    Place the ignition switch in the ‘Off’ position.

2.    Connect the scan tool to the WCM through the data link connector cable.

3.     ‘On’ the ignition switch.

4.    Select the specific vehicle information, and seek contents.

Extensions of the common process

To read and erase diagnosis codes the battery of the vehicle should be in good condition. The low voltage of the battery will fail to set the diagnostic trouble codes. So check the battery power and start conducting the common process and then select ‘ETASC’ from the system spec list. Select diagnostic trouble code (DTC) and press ‘OK’.

To diagnose the CAN bus lines of the system, select “CAN bus diagnosis” from the start-up screen. When the scanner displays the vehicle information, check and confirm the compatibility of the settings to the vehicle under-diagnosis. Unable to find the matching entry, enter the information manually. Check and press ‘Ok’. When the base is set go for the 8-step diagnosis process.

Diagnostic Trouble Code Procedure

The diagnostic process of trouble codes consists of 5 phases.

  1. Identification of the relevant cautions and initiation of the process.
  2. DTC set condition phase
  3. Technical description evaluation
  4. Troubleshooting hints assessment
  5. Diagnosis

General Tips

  1.  Always turn the ignition switch to ‘OFF’ before connecting/ disconnecting the scanner tool.
  2. Check for the battery power of the vehicle. Low battery power won’t place the diagnostic trouble code properly.
  3. Always follow up on the logical conditions of the registration flow chart.
  4. Do not replace the Engine Control Module (ECM) and the WCM at the same time.
  5. When replacing multiple ECMs always replace one at a time. Complete the ID registration and then move to the next ECM replacement.
  6. Troubleshooting hits provide a guide to problem identification.
  7. If a WCM has been replaced, then always register the relevant IDs before moving to the next steps.

Also Read: 7 Best Modern Upgrades for Your Classic Car


Wireless Control Modules support individuals to ease up their lives. Hence the proper function of such systems is important. Based on indications and tips, professionals apply tests to verify the problem. A common process that considers the primary stage and the convenient test stage relevant to the diagnosis.