Turn signal and hazard Control

If conditions of activating flashing conflict with each other, functional priorities are as following:

1st : Arm/Disarm/Flashing (Burglar Alarm system) & Tailgate release Flashing

2nd : Burglar Alarm Flashing

3rd : Panic (including MTS) Flashing

4th : Hazard Flashing

5th : Turn Signal Flashing

If the Left (or Right) turn switch is active and if IGN2 is On, the left (or Right) turn signal outputs are driven. The turn signal is active as long as both conditions ((Turn Signal LH switch or L_Turn Signal RH switch = On) and IGN2 = On) are true and is turned Off when one of these conditions is no longer detected.

If a failure is detected (Bulb/LED) outage or open load on the activated turn signal side, the flasher frequency is doubled.

This failure can be detected when IGN1 and IGN2 On (IGN1 = On and IGN2 = On).

While turn switch is ON and failure was detected, even if bulb (or LED) failure is no longer detected, keep the double blinking flashing and after next turn switch ON transition, only then, flasher is activated with normal blinking.

Fig 2: Turn Left / Right Signal Flashing Blinking Pattern

Courtesy of KIA MOTORS AMERICA, INC.

The Flasher Lane-Change feature is initiated with a momentary activation of the turn switch. The turn signal will then flash 3 times.

This lane-change feature operates under the following conditions:

1. Lane change mode enabled (Lane Enable = ON)
2. The Lane Change feature will not work without voltage on the Ignition 2 circuit.
3. The "bulb-fail" mode is not working and the flashing frequency is always normal blinking in lane change mode (85 ±10 period/min).
4. During the lane change mode operation, if the user moves the turn switch in the other direction, then lane change mode is finished and the other direction's flashing (normal or lane change flashing) will start depending on the switch detection time.
   Fig 3: Lane Change Turn Left / Right Signal Control Blinking Pattern

   Courtesy of KIA MOTORS AMERICA, INC.

Activating the hazard switch generates the hazard signal, regardless of the Ignition key position. The hazard signal is a permanent sequence. It goes off when the hazard switch is deactivated. The hazard drives both the Left and Right flashing sides.

Like the turn signal flashing, if bulb (or LED) failure is detected, flashing frequency is doubled. But it is Only possible in IGN1 and IGN2 ON (IGN1 = ON and IGN2 = ON).

Fig 4: Hazard Flashing Function Blinking Pattern

Courtesy of KIA MOTORS AMERICA, INC.

Hazard flashing has a higher priority than turn Left/Right control.

1. During hazard flashing, if turn Flashing is requested, keep the hazard operation.
2. During turn flashing, if hazard flashing is requested, interrupt the turn flashing and start hazard operation immediately.
3. During hazard operation if hazard and turn switch are On at the same time, if hazard switch is turned Off, turn flashing starts to operate but, does not discontinue the running period.
   Fig 5: Turn Signal And Hazard Blinking Pattern

   Courtesy of KIA MOTORS AMERICA, INC.

In case of activation of hazard the fault detection will be able to detect the failure only if 3 bulbs of Front or Rear are broken-down.

In case of turn signal activation when one of the front or rear is broken-down (Lamp failure), the turn signal blinks with double frequency. Lamp failure condition as below:

1. Flasher fault detection should be inhibited according to Battery voltage, i.e.: When the Vbat voltage is lower than flasher fault voltage detection (9V). This threshold for flasher fault detection should be configured as a calibration variable (EEPROM variable)
2. The fault detection is done while output for turn left/right or hazard is active and IGN1 ON and IGN2 ON (lane change is not included), once fault is detected, IPM keep the fault mode until flasher triggering condition is released (Turn right or left switch off/ IGN2 or hazard switch off)