Geely Emgrand X7. Manual part — 515

11.4.3 System work principle

11.4.3.1 System operating principle

Headlamp operating principle

When the light combination switch is turned to the “headlamp” gear, the operating voltage is input
through a terminal No. 13 of the combination switch wire harness connector IP42, and the
headlamp relay is driven to close through control grounding of a terminal No. 16 of the wire
harness connector IP42 to turn on the headlamp. The headlamp supply voltage is transmitted to the
headlamp optical axis regulating switch as well as left and right headlamp optical axis regulating
motors; at this time, the signal voltage of the regulating motor can be changed by turning the
regulating switch up and down, thereby realizing the height regulating function of the headlamp.

Notes:

The regulating motor may not work or be damaged due to the frequently turning of the button.
When BCM (centralized controller) monitors that the voltage of a terminal No. 6 of a light
combination switch wire harness connector IP42 is less than 1V, which shows that the switch is in
"AUTO" (automatic transmission); at this time, the BCM shall monitor a signal from an ambient
light sensor; if the ambient illumination is not strong, the BCM will input power supply from a
terminal No. 5 of the IP49, a headlamp relay is driven to close by controlling grounding through a
terminal No. 7 of a wire harness connector IP50, so that the headlamp automatically turns on;
when the ambient illumination is strengthened, the MCB cuts off the power supply output, so as to
realize that the headlamp automatically turns off.

When the light combination switch is turned to the high beam position, the operating voltage is
input through the terminal No. 7 of the combination switch wire harness connector IP42, and the
high beam relay is driven to close through control grounding of the terminal No. 16 of the wire
harness connector IP42 to turn on the high beam; and at the same time, the high beam provides.

Voltage is sent to the instrument to turn on the high beam indicator lamp therein.

Notes:

The working voltage of high beam lamp relay is from the headlamp power supply circuit.

Position lamp operating principle

When the light combination switch is turned to the "headlamp" gear, the switch signal is output to
a terminal No. 26 of the BCM wire harness connector IP50 through a terminal No. 14 of the wire
harness connector IP42 of the combination switch, and the operating voltage turns on all position
lamps through BCM wire harness connector position lamps passing through IP49-20 and IP49-10;
the operating voltage turns on left and right license plate lamps through the BCM wire harness
connector position lamps passing through IP49-8; and at the same time, the voltage is transmitted
to a back light regulating switch, and the brightness of the back light can be regulated through the
switch.

Front fog lamp operating principle

Coil driving power supply of the front fog lamp relay is from the terminal No. 8 of the IP49 of the
BCM. When the front fog lamp switch is switched off, the switch provides the grounding circuit to
drive the front fog lamp relay to close, and the operating voltage turns on the front fog lamp
through the relay. Meanwhile, this voltage is transmitted to the instrument.

Illuminate the front fog lamp indicator.

Rear fog lamp operating principle

Coil driving power supply of the rear fog lamp relay is from terminal No. 8 of the IP49 of the
BCM. After the rear fog lamp switch is closed, the rear fog lamp turns on. At the same time, this
voltage is sent to the instrument panel to light the front fog lamp indicator.

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Steering lamp operating principle

Multifunctional steering column controls the grounding circuit of the terminal No. 1 and 3 of the
light combination switch wire harness connector, and the grounding signal is transmitted to the
BCM. The BCM respectively turns on the left and right steering lamps through the output voltages
of Terminals 8 and 9 of the harness connector IP48.

Notes:

When pressing down a hazard warning lamp button, the BCM outputs voltage to the two circuits
and turns on all steering lamps.

Brake lamp operating principle

The brake lamps are controlled by the brake lamp switch on the brake pedal. When the brake
pedal is depressed.The working voltage is directly sent to the brake lamp bulb through the switch.

Notes:

The high braking lamp is arranged at the topside of the back door.

Reverse lamp operating principle

The reverse lamp is controlled by the reverse lamp switch arranged on the transmission. When the
vehicle is at reversing, the working voltage is directly sent to the brake lamp bulb through the
switch.

Operating principle of courtesy lamp and luggage compartment (back door) lamp

The power supply of the courtesy lamp and the trunk lamp is from the indoor fuse IF06.

When opening the door, a grounding circuit of a courtesy lamp is connected by a door latch switch,
so that the courtesy lamp of the door turns on.

After opening the back door, the back lock latch switch will access the grounding circuit of the
trunk lamp to turn on the trunk lamp.

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11.4.4 Part position

11.4.4.1 Component position

Front-end of vehicle body

1

2

5

3

4

NL11-2035b

1. Low

beam

2. Steering

lamp

3. High-beam

lamp

4. Position

lamp

5. Front fog lamp

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Rear-end of vehicle body

2

1

3

NL11-2036b

1. High

brake

lamp

2. Rear combination lamp assembly

3. Rear fog lamp (added rear reflex

reflector)

Rear Combination Lamp Assembly

1

2

3

1

2

3

NL11-2037b

1. Brake light and position light

2. Steering

lamp

3. Reversing

lamp

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