When the headlamp switch is placed in the AUTO position, with the windshield wipers ON in daylight conditions, after a 6 second delayīattery voltage is applied at all times to the coil and switch sides of the LOW BEAM PCB Relay located in the underhood fuse block. When the headlamp switch is in the AUTO position, for automatic lamp control (ALC) When the headlamp switch in the HEAD position for normal operations It's non -replaceable ,if bad whole fuse box has to be replaced ! The low beam headlamps may be turned ON in 3 different ways: It is located in the under hood fuse/relay box. In the left front of the passenger compartment, in the steering column Lighting Systems Connector End Views in Lighting Systems Lighting Systems Component Views in Lighting Systems Under the left side of the IP, to the right of the steering column If you look on top of fuse there are two metal tabs ,check there for B+ voltage, If no B+ voltage the LCM - lamp control module isn't supplying any. If the fuse is good check for B+ voltage with the low beams on. The LCM then removes battery positive voltage (B+) from the low beam headlamps and supplies battery positive voltage (B+) through the underhood fuse block HDHIBML fuse and HDHIBMR fuse, which feed the left high beam headlamp and the right high beam headlamp respectively.Ĭheck this fuse in the left under hood fuse box first. When you activate the headlamp dimmer switch by pulling on the multifunction lever until the switch clicks, the high beam input circuit to the LCM in grounded. The LCM then applies battery positive voltage (B+) through the underhood fuse block HDLOBML fuse and HDLOBMR fuse, which feed the left low beam headlamp and the right low beam headlamp respectively. When you place the headlamp switch in the HEAD position, the headlamps input to the LCM is grounded. You need to isolate the circuits, pull fuse's till the fuse doesn't blow !īattery positive voltage (B+) is applied at all times to the lamp control module (LCM) through the underhood fuse block HDLP fuse. Any one of those circuits could have your short. A/C compressor relay, rear window defroster relay ,daytime running lights. you will also see it powers the igintion switch ,look at last part of ignition switch, when in start or run that 40 amp fuse powers all those other fuse's plus three relays i see there also. You will see Ign A 40 amp fuse at the top of the page. First blue link scroll down to the second diagram. year, make, model an engine, Under system click on electrical distribution, under sub system click on power distribution. That 40amp fuse powers a lot of subsystems ! If you were to jump 30 to 87 in the relay box the starter should spin the engine over, not start an run just spin ! 85 & 86 is the control side. If you pull the relay out of the box it's plugged into an look on the bottom of it you would see four sets of numbers ! 30 & 87 an 85 & 86. Which fuse ? IGN A - 40 amp ,under hood fuse / relay box ? This fuse powers the Starter Relay and Ignition and Start Switchĭoes your vehicle have a manual or automatic transmission ? The starter relay could be shorted inside, It's also located in the under hood fuse box. What all does that fused supply B+ voltage too ? Do you know ? That would be your first thing to find out ! Do you know what a electrical distribution diagram is ? Do you know how to test electrical circuits with a DVOM - digital volt ohm meter ? Do you know what a short to ground is ?
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