Test E: The Headlamps Are On Continuously

PINPOINT TEST E: THE HEADLAMPS ARE ON CONTINUOUSLY

Normal Operation
When the headlamp switch is placed in the HEADLAMPS ON position, voltage is routed through circuit 15 (RD/YE) to the multifunction switch. The vehicle security module (VSM) also supplies voltage to circuit 15 (RD/YE) when the autolamp system has requested the exterior lamps on.

For low beam headlamps, the multifunction switch routes voltage through circuit 13 (RD/BK) to the central junction box (CJB) fuses 25 (10A) (LH headlamp) and 23 (10A) (RH headlamp). If equipped with daytime running lamps (DRL), the DRL resistor also routes voltage to circuit 13 (RD/BK) (at a reduced voltage) when the ignition is in the RUN position and the high beams are off.

After passing through the fuses, voltage is then routed through circuits 160 (DB/WH) (LH headlamp) and 161 (DG/OG) (RH headlamp) to the low beam headlamps.

For high beam headlamps, the multifunction switch routes voltage to circuit 275 (YE) to the high beam relay. When the high beam relay receives voltage from circuit 275 (YE), the high beam relay energizes. Battery voltage from the CJB is then routed to circuit 12 (LG/BK), through CJB fuse 35 (20A), to the high beam headlamps. The fog lamp relay coil uses the high beam circuit as a ground when energized.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- High beam relay
- Fog lamp relay
- DRL system
- Headlamp switch
- Multifunction switch
- CJB
- VSM

E1-E9:

E10-E14: