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Your ebcm internal relay is likely failed, possibly has a c0265 code in ebcm. Pull the abs maxi-fuse underhood fuseblock, abs and red brake light will come on, but noise should stop. There are several module rebuilders online (module masters comes to mind)
{: ) At the underhood fuseblock, the AUX PWR fuse 20amps is for the Instrument panel and center console outlets, while the RR APO fuse 20amps is for the rear console and rear power outlets.
If your vehicle is equipped with an accessory 110vac, there is this PWR OUTLET fuse 25amps also at the underhood fuseblock. See red arrows on the sample diagram below:
Safety reminders: Use only fuses of the same specifications. A higher fuse rating replacement can heat the wirings and could cause fire.
{: ) It seems you have done your homework well. I presume you are referring about the main power source of the relay coming from the battery. And that you dont have any trouble with the relay receiving the control signal commanded by your headlamp switch.
You can try these: Turn ignition off. On your underhood fuseblock, there is a 15amp fuse labeled HDM. Pull this out and make sure its not blown. If it is, replace with same amp rating and check again operation. Otherwise proceed with the next step.
Using your test lamp, probe on the exposed conductor on the fuse for voltage. The test lamp should light up whenever you probe on either side of the fuse, otherwise your fuseblock is in question. We can rule out the main wiring issue if the fuseblock is supplying power to all other circuits on your vehicle. Ihope you get lucky.
the fuse for the reverse lights is located on the underhood fuse block. Look for the fuselabel VEH Backup and it's 10amps. If the ignition is switched off, transm in Park, and the reverse lights still on, try removing this fuse. The reverse lights shoud be off, which means the wiring from the fuseblock going to the reverse lamps is not the fault. If the lights stayed on after removing the fuse, then you have two possible culprits. The underhood fuseblock may be shorted, or a BCM (Body Control Module) that is malfunctioning. This is assuming that the wirings going to these components are normally sound. This requires thorough testing procedures.. goodluck and have a nice day. : )
{: ) Check the fuses at the I/P fuseblock labelled CRUISE(10amp) and STOP(15amp). Also check the the ETC/ECM fuse(15amp) at the underhood fuseblock. A faulty brakepedal switch is most likely the cause. The cruise control system will not function properly if this switch is giving inaccurate voltage signals.
{: ) The main fuse is located at the underhood fuseblock labeled STOP LAMP 25A. At the rear fuseblock there are 2 in-line fuses labeled VEH STOP 15A and VEH CHMSL 10A (this one is for the middle brakelight)
THE FRONT CONTROL MODULE IS LOCATED ON THE END OF THE UNDERHOOD FUSEBLOCK..YOU MUST REMOVE 1 BOLT FROM FUSEBLOCK AND 1 PLASTIC CLIP..SLIDE FUSEBLOCK BACK..FCM IS ATTACHED WITH 4 SCREWS TO FUSEBLOCK..PCM IS LOCATED ON RIGHT SIDE OF FIREWALL OF ENGINE COMPARTMENT..I HOPE THIS HELPS
SOUNDS LIKE INTEGRATED POWER MODULE(UNDERHOOD FUSEBLOCK)IS DEFECTIVE..ALSO CHECK FOR CORRODED TERMINALS IN CONNECTORS ON FUSEBLOCK..HAVE SEEN THIS BEFORE AND NEW FUSEBLOCK WAS NEEDED AND REPAIRED PROBLEM
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