Bulb, roof lighting, front (50F), 4D
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Bulb, roof lighting, front (50F), 4D
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Front roof light bulb (50F)
Used as general front roof lighting.
Two lamps and a switch are integrated in the front roof console. The switch has three positions, 1, 0 and 2. In the centre position (0), lighting is controlled automatically based on the doors and key position. In the rear position (1), the lights are off. Lights are continuously on in the front position (2).
The lamps are grounded with PWM from BCM via REC. The lamps are supplied power from a relay controlled by BCM. The supply voltage lead passes through BCM and REC on its way to the lamps. BCM takes a reading from the lead to determine whether the switch has suddenly been moved to the front position when the relay is not activated.
Pin No.
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Signal type
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Description
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685F pin 1
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Ground
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When the switch (53) is in position 2, the lamp (50F) is grounded in the car body.
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685F pin 3
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Ground
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When the switch (53) is in position 2, the lamp (50F) is grounded in the car body.
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685F pin 4
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Ground
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When the switch (53) is in position 0, the lamps are grounded by BCM pin A18 (K78).
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685F pin 2
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Power supply
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From BCM pin A19 (K78)
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