Question about 2003 Chevrolet Silverado 2500HD

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Battery indicator light and the hibeam indicator light are on at all times ignition off in park,this drains the battery in 2/3 days

The battery indicator light flickers and sometimes it goes out the period, of time its out varies constantly the blue hibeam light looks like its at reduced voltage due to its brightness ,or lack of

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  • ron gundy Dec 05, 2011

    I disconnected the neg battery cable . I put a 12vdc test light between the neg battery post and the neg, battery cable the test light ,lights .I pulled individual fuses and relays in the fuse panel under the hood one at a time the light stays on ,I pulled the gage panel fuse the test light stays on.I pulled the fuses one at a time in the fuse panel on the side of the dash ,the light stays on .The light for the battery indicator and hibeam indicator lights are still on ( they went out when I pulled the gage fuse),I installed a new battery and it went dead in 2 1/2 days ! I'm at a total loss where to look ,HELP PLEASE !!!!!!!!!

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Possibly a stuck switch for the hi/lo relay

Posted on Dec 02, 2011

  • ron gundy Dec 02, 2011

    thank you ,I'll have the mechanic check it out

  • ron gundy Dec 03, 2011

    Hi jeremy,good thought on the stuck relay but unfortunately I still have the problem,looking more like a gage cluster replacement ,Geez i hope not it will stay a problem if thats the case thanks again

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Backup Lamp Circuit Description
Battery positive voltage (B+) is supplied at all times to the REVERSE relay coil through the rear fuse block. Battery positive voltage (B+) is supplied at all times from the rear fuse block NSBU Fuse to the REVERSE relay switch. The powertrain control module (PCM) sends a class 2 message to the rear integration module (RIM) indicating that the gear selector lever is in the REVERSE position. The dash integration module (DIM) sends a class 2 message through power moding that the ignition switch is in the ON position. When these conditions occur, the RIM grounds the REVERSE relay coil. The coil is energized, closing the switch contacts. This supplies battery positive voltage (B+) to the backup lamps. The backup lamps are both permanently grounded, so both backup lamps have power and ground, and then light.

Do you know about class 2 serial data communications between control modules ? Do you know there is a fuse box under the rear seat ?

This is information taken from a Buick service repair manual !

Park Lamps
The dash integration module (DIM) supplies battery positive voltage (B+) to the PRK LP relay coil. When the headlamps or park lamps need to be on or when the ignition switch is in the ON position. Battery positive voltage (B+) is supplied at all times to the PRK LP relay switch. When the park lamps are to be active, the DIM grounds the PRK LP relay coil. The coil is energized, closing the switch contacts. Battery positive voltage (B+) is supplied to the rear fuse block RH PARK LP Fuse, LH PARK LP Fuse, and DIMR Fuse. The LH PARK LP Fuse supplies battery positive voltage (B+) to the LH park lamps. The LH PARK LP Fuse supplies battery positive voltage (B+) to the LH park lamps. The LH and RH park lamps are permanently grounded, so all park lamps have power and ground, and then light. The DIMR Fuse supplies battery positive voltage (B+) to the DIM park lamp input for interior lamps dimming, the license lamps, the underhood lamp, and the cornering lamps. The license lamps are permanently grounded, so both license lamps have power and ground, and then light.

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• The instrument panel module (IPM)
• The rear integration module (RIM)
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Battery voltage is provided from the rear fuse block to the RIM. Ignition voltage is provided from the rear fuse block to the RIM. These voltage inputs are referenced to module ground. The RIM is wired to the class 2 serial data line. The various RIM input and output circuits are described in the corresponding functional areas as indicated on the RIM electrical schematics.
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1 Answer

Why does my battery drain down when car is parked longer than 2 days


ah double posted and added that key word, PARKED
no matter, the alternator does nothing parked, sorry.
this i called phantom drains.
battery charged before bed time, parked.
next morning its not 12.6vdc but 12.0, that is called battery discharge.

phantom poster, and drain.
http://www.fixkick.com/drain/drain.html

double answered, i rarely ever double answer but for, you yes.
this one time.

this happens on all machines, with batteries, cars, boats ,planes and trains. all.

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1 Answer

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So start with checking for a drain.
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