Bulb, roof lighting, front (50F), 4D: Connection
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.
CONNECTOR PINOUTS REFERENCE
| Pin No. | Signal type | Description |
|---|---|---|
| 685F pin 1 | Ground | When the switch (53) is in position 2, the lamp (50F) is grounded in the car body. |
| 685F pin 3 | Ground | When the switch (53) is in position 2, the lamp (50F) is grounded in the car body. |
| 685F pin 4 | Ground | When the switch (53) is in position 0, the lamps are grounded by BCM pin A18 (K78). |
| 685F pin 2 | Power supply | From BCM pin A19 (K78) |