P1690 HYUNDAI – Immobilizer SMARTRA No Response

P1690 HYUNDAI Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light),No start situation

P1690 HYUNDAI Possible Causes

No response from SMARTRA,Antenna coil error,Communication line error (Open/Short etc.),Invalid message from SMARTRA to Engine Control Module (ECM),Faulty SMARTRA

P1690 HYUNDAI Description

The immobilizer system will disable the vehicle unless the proper ignition key is used, in addition to the currently available anti-theft systems such as car alarms, the immobilizer system aims to drastically reduce the rate of auto theft. The SMARTRA carries out the communication with the built-in transponder of the ignition key. This wireless communication runs by RF (Radio frequency of 125 kHz). The SMARTRA is mounted at the ignition lock close to the antenna coil for RF transmission and receiving. The RF signal from the transponder received by the antenna coil is converted into messages for serial communication by the SMARTRA device. And the received messages from the EMS are converted into the RF signal, which is transmitted, to the transponder by the antenna. The SMATRA executes the encryption algorithm and transmits the encryption result. And SMARTRA is in charge of relaying from EMS to Transponder. The SMARTRA is taught in key learning process and stores the DPN (converted from PIN) in memory inside SMARTRA. This DPN (converted from PIN) is used in encryption algorithm between EMS and SMARTRA and to neutralize the SMARTRA. When SMARTRA is neutral, old DPN (converted from PIN) and SEK (generated from DPN) are deleted. New DPN (converted from PIN) can be stored in Neutral SMARTRA. The SMATRA Learning is possible in the case that the status of SMARTAR is virgin or neutral. In case that the SMARTRA3 is learned, the SMARTRA will transmit the information whether DPN (converted from PIN) inputted from tester is same as the DPN (converted from PIN) in SMARTRA. The SMARTRA Learning is possible regardless of key status. The SEK (generated from DPN) is used in encrypted communication between SMARTRA and EMS. The SEK (generated from DPN) is made from DPN (converted from PIN) inputted during SMARTRA3 Learning. If the SMARTRA is learned, the SEK (generated from DPN) will be stored in EEPROM. The EMS stores the SEK (generated from DPN) in EEPROM in case that one more key is taught validly. If the DPN (converted from PIN) inputted from EMS failover 3 trials (3 trials: continuously or intermittently), the EMS will not accept the request of key Learning for an hour. Disconnecting the battery or other manipulation cannot reduce this time. After the connecting of battery to EMS the timer starts again for one hour