Turn signal lamps / Hazard warning signal flashers

Fig 1: Turn Signal Lamps And Hazard Warning Signal Flashers

Courtesy of VOLVO CARS OF NORTH AMERICA.

There are six lamps around the car to indicate direction changes. These are located in the front and rear lights and on the sides of the car in front of the front doors.

The turn signal lamps are operated using the left-hand control stalk.

To cancel the hazard warning signal flashers, where all the turn signal lights flash, press in the button for the hazard warning signal flasher. This is positioned in the middle of the dashboard by the center air vents.

The central electronic module (CEM) supplies the lamps with power via two shunts. These are located on the relay box by the central electronic module (CEM). A signal is also sent to the bulb in the hazard warning signal flasher switch when this function is activated.

The central electronic module (CEM) monitors the power consumption on each side to check for bulb faults. If the power consumption falls below a certain threshold value, a fault is indicated and the frequency of the signal to the bulbs is doubled on the side of the blown lamp.

There are diagnostics for the shunts.