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ELECTRICAL
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1. EXTERIOR LIGHTS
The lighting system of a motor vehicle consists of lighting and signaling devices mounted or integrated to the
front, sides, rear, and in some cases the top of the motor vehicle. The purpose of this system is to provide
illumination for the driver to operate the vehicle safely after dark, to increase the conspicuity of the vehicle,
and to display information about the vehicle's presence, position, size, direction of travel, and driver's
intentions regarding direction and speed of travel
1.1 TURN SIGNALS & HAZARD LIGHTS
1.1.1 Description
Turn signals — formally called "directional indicators" or "directional signals", and informally known as
"directional‘ s", "blinkers", "indicators" or "flashers" — are signal lights mounted near the left and right front
and rear corners of a vehicle, and on the sides, used to indicate to other drivers that the operator intends a
lateral change of position (turn or lane change).
1.1.2 Conditional Requirements
Activation –
• Hazard switch is activated or
• Turn left / Turn right switch is activated & IGN On/Crank or
• Crash is detected or
• Force panic is activated.
Deactivation –
• Hazard switch is deactivated &
• Turn left / Turn right switch is deactivated & IGN OFF &
• Crash condition is removed &
• Force panic is deactivated.
Tell-tale Indication -
On IC as long as the hazard is activated.
On Fault –
No telltale indication if all loads are failed & and respective DTC logged
Any of load fails , the remaining bulb flashing with double frequency and respective DTC logged.
1.1.3 Operating Voltage Range
DESCRIPTION
REQUIREMENT
VOLTAGE
Turn signal
Normal voltage range
9V-16V
Hazard Lights
Normal voltage range
Threshold: If voltage drops below 6V, then it should stop
working AND when voltage rises to/above 7V, then it should
start working.
7V-16V