High Beam Headlamps

The high beam headlamps are illuminated when all of the following relays are energized by the BCM.
1. Daytime Running Lamps (DRL) relay K151
2. Headlamp relay, LH (high beam) K133
3. Headlamp relay, RH (high beam) K132

The daytime running lamp relay K151 has B+ supplied at all times to the switch side of the relay. When the daytime running lamp relay is energized by the BCM, the relay internal switch closes and B+ is supplied to the LH headlamp. The LH headlamp relay K133 has ground supplied at all times to the switch side of the relay. When the LH headlamp Relay K133 is energized by the BCM, ground is supplied to the LH headlamp and it illuminates.

The RH headlamp relay K132 has B+ supplied at all times to the switch side of the relay. When the RH headlamp relay K132 is energized by the BCM, the relay internal switch closes and B+ is supplied to the RH headlamp. The RH headlamp is grounded at all times by G103 and the RH headlamp illuminates. The BCM will energize the RH and LH headlamp relays and the daytime running lamp relay when the BCM receive B+ from the turn signal switch (high beam switch). The LO BEAM Fuse supplies voltage to the turn signal switch only when the low beam headlamps are on. When the turn signal lever is pushed forward, the turn signal switch sends B+ to the BCM. When the BCM receives B+ from the turn signal switch, it then sends a ground signal to the daytime running lamp relay K151 and the LH and RH headlamp relays. The coil side of the relays have B+ supplied to them at all times and the relays energize, closing the internal switch contacts.