Rear fog lights switch (161): Connection
The light switch is directly grounded to the body. The rear fog light pin is fed separately via a resistor integrated in BCM. Voltage between the pin and ground will be 0 V when the circuit is closed to ground and approx. 6 V when it is open. If the control module reads 10.2 V, it will interpret it as a break. The LEDs are grounded internally and are supplied PWM from BCM.
DESCRIPTION CHART
| Pin No. | Signal type | Description |
|---|---|---|
| 4 | Lighting | From BCM. + supply with PWM to LEDs |
| 2 | Rear fog light | To BCM. Grounded when the button is depressed |
| 1 | Ground | Ground in the body |