Low Frequency Initiator

The LFI is located at each vehicle wheel house(F/L, F/R, R/L, R/R). Only HIGH-LINE systems are fitted with LFI units. An LFI unit is mounted in each wheel well of a vehicle to enable the Receiver unit to determine the vehicle position of each WE for which it has a stored ID code. Using a digital bi-directional serial CONTROL line to each LFI, the Receiver can activate an LFI to send out an LF message and trigger the WE sensor near its location to respond with an RF transmission. By activating the LFI units one at a time, the Receiver can automatically locate the vehicle position of each WE. For fault detection, the LFI will report back its “operating properly” status to the Receiver via the CONTROL line.

The transmitter is capable of receiving an LF signal from a Low Frequency Initiator (LFI) mounted in the wheel well. The transmitter respond to a valid command from the LFI with a RF response. The transmitter changes from Normal state to Storage state and from Storage state to Normal state with a valid command from the LFI. The LF communication prolonges battery life (through state changes) and determines sensor location (through one-to-one handshaking between LFI and transmitter).

This DTC indicates that ECU does not detect "PASS" or "FAIL" pulse from Rear Left LFI module (No Response from LFI = Open). -OR- ECU detects Open, Short to battery/ground in LFI Signal Circuit or Open in Ground. If this DTC is detected, ECU sets additionally 'C1314' after LFI activity cycle. Also ECU sets all four DTC’s (1351-1354) if one or more Signal Circuit are shorted to battery.