Circuit Description

The BCM monitors the voltage on the headlamp dimmer switch high beam signal circuit in order to determine the amount of voltage present in the high beam circuit. The BCM will set DTC B2600 when either of the following conditions exists:

• The headlamp dimmer switch high beam signal circuit is shorted to battery voltage.
• The headlamp dimmer switch high beam signal circuit is shorted to ground and the daytime running lamps (DRL) are requested ON.

The BCM monitors the headlamp dimmer switch high beam signal circuit in order to determine if either of the following lamps are ON:

• The DRL
• The high beams