Wireless Control Module (Wcm) - Lancer Evolution: Overview Mitsubishi Lancer X

GENERAL INFORMATION

The wireless control module (WCM) is a system that integrates the keyless entry function, with which remote operation (opening/closing of all doors, opening of trunk lid, and operation of warning function that warns a person who intends to damage the vehicle *), can be performed by operating the lock/unlock button, trunk lid button or panic button on the ignition key (transmitter). Also, WCM incorporates the immobilizer function, which prohibits the starting of engine using an unauthorized key, and the tire pressure monitoring system (TPMS), which issues a warning to a driver by illuminating or flashing the warning light if an abnormality to the tire pressure or the system error is detected. WCM has the following features

1. The ignition key has an indicator light that enables the driver to check if the signal is transmitted correctly or if the battery in the key is discharged.
2. Each vehicle is provided with two ignition keys, and up to eight ignition keys can be registered.
3. Settings of the keyless entry function can be adjusted using a customization function. NOTE: *: Horn sounds, and headlights and taillights flash.

Scheme 1

TECHNICAL DESCRIPTION (COMMENT)

If no data [ETACS transmits engine random number data to WCM via the CAN bus lines] is received from the engine control module via the CAN bus lines when the ignition switch is turned to ON position, it is judged as abnormal.

WCM determines that the abnormality is present when no VIN is recorded in it.

1. B1A08: WCM determines that the abnormality is present when the rolling code received from the transmitter 1 (the first transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
2. B1A09: WCM determines that the abnormality is present when the rolling code received from the transmitter 2 (the second transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
3. B1A0A: WCM determines that the abnormality is present when the rolling code received from the transmitter 3 (the third transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
4. B1A0B: WCM determines that the abnormality is present when the rolling code received from the transmitter 4 (the fourth transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
5. B1A0C: WCM determines that the abnormality is present when the rolling code received from the transmitter 5 (the fifth transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
6. B1A0D: WCM determines that the abnormality is present when the rolling code received from the transmitter 6 (the sixth transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
7. B1A0E: WCM determines that the abnormality is present when the rolling code received from the transmitter 7 (the seventh transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
8. B1A0F: WCM determines that the abnormality is present when the rolling code received from the transmitter 8 (the eighth transmitter registered in WCM) greatly differs from the rolling code stored in WCM.

1. B1A10: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 1 (the first transmitter registered in WCM) five consecutive times.
2. B1A11: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 2 (the second transmitter registered in WCM) five consecutive times.
3. B1A12: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 3 (the third transmitter registered in WCM) five consecutive times.
4. B1A13: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 4 (the fourth transmitter registered in WCM) five consecutive times.
5. B1A14: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 5 (the fifth transmitter registered in WCM) five consecutive times.
6. B1A15: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 6 (the sixth transmitter registered in WCM) five consecutive times.
7. B1A16: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 7 (the seventh transmitter registered in WCM) five consecutive times.
8. B1A17: WCM determines that the abnormality is present when it receives low battery voltage signal from the transmitter 8 (the eighth transmitter registered in WCM) five consecutive times.

WCM determines that the abnormality is present, if the ignition key's key ID is not registered in WCM when the ignition switch is turned ON.

WCM determines that the abnormality is present, if the key ID for the ignition key does not match the one registered in WCM when the ignition switch is turned ON.

WCM determines that the abnormality is present, if the key certification result and the engine control module starting condition do not match after the engine start permission communication is completed.

WCM determines that the abnormality is present, if it cannot receive the key ID for the ignition key when the ignition switch is turned ON.

WCM determines that the abnormality is present, if it has detected discrepancy in the ignition switch level shown below ten consecutive times when WCM has received the CAN message (ignition switch position information) from ETACS-ECU with the ignition switch turned to the ON or START position.

WCM determines that the abnormality is present when the vehicle information registered in it does not match the vehicle information data.

WCM determines that the abnormality is present when VIN registered in it and the one that has been transmitted on the CAN bus do not match.

When the ignition switch is turned ON, WCM transmits signal to the antenna. When the antenna is found faulty, WCM determines that the abnormality is present.

If the number of keyless ID registered transmitter is zero, the WCM determines that there is a problem.

The reciever antenna assembly receives the transmitter signal. The reciever antenna assembly transmits the received signal to the WCM. If an open circuit or short to ground occurs on the wiring harness between WCM and reciever antenna assembly at this time, WCM determines that there is a problem.

WCM determines that the abnormality is present, if the data abnormality is found when the ignition switch is turned ON and then EEPROM is written.

TECHNICAL DESCRIPTION(COMMENT)

If WCM cannot perform the data transmission in normal conditions due to a malfunction of the CAN-B bus circuit, WCM determines that there is a problem.

CIRCUIT OPERATION

WCM receives the vehicle information stored in the ETACS-ECU via CAN bus lines.

If the M.U.T.-III cannot communicate with the WCM, the CAN bus lines may be defective. If the WCM does not work, the WCM or the power supply circuit may be defective.

If only some ignition keys cannot be registered, the ignition key itself may be faulty. If no ignition key can be registered, the key assembly may have already been registered for another vehicle, or the WCM may be faulty.

If the fuel injection does not work, WCM and the MFI system may have a problem. This symptom is not considered abnormal when the engine is started by an ignition key that has not been registered.

If the WCM does not work at all or if the WCM cannot communicate with the scan tool, the WCM power supply or the ground circuit may be defective.

The reciever antenna assembly receives the lock/unlock signals from the transmitter, and sends them to the WCM, and further to the ETACS-ECU. Then, the ETACS-ECU receives the signals of the key reminder switch and all door switches, then activates the keyless entry system.

If the hazard warning light and the dome light works normally, ETACS-ECU may be faulty. Also, the answerback function may have been disabled using the customization function.

If the timer lock function does not work normally, the keyless entry transmitter input signal circuit or ETACS-ECU may be faulty.

The reciever antenna assembly receives the trunk signals from the transmitter, and sends them to the WCM, and further to the ETACS-ECU. Then the ETACS-ECU determines to actuate the trunk open function of the keyless entry system.

Input signal from the keyless entry transmitter is used to operate the keyless entry system. If the signal is abnormal, the keyless entry system will not work normally.