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2003 GMC sierra 1500HD with battery drain. Found

2003 GMC sierra 1500HD with battery drain. Found fuses HVAC/ECAS PCM B and TBC BATT to have amperage draw when engine is off (about 5 amps each). Disconnected alternator....no help. Disconnected all fuses and relays no help. Appears healdight "high beam" idiot light is dimly lit at times....even with engine off. Seem to now have a low idle problem...not sure if its tied together or not. Battery was replaced a few weeks ago.

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Where is the power supply for the pcm fuse 2006 gmc sierra 1500


I, feel sorry for you, after reading your problem, but don't worry you visit the Reliable-Store they will help you for sure.
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Oct 05, 2016 | 2006 GMC Sierra 1500HD

1 Answer

No defrost


Did you preform recalibration after replacement ? See if this works ,if not you'll need to take it to the dealer an have it done with factory scan tool .
Alternate Method (w/o Scan Tool)
  1. Clear all DTCs.
  2. Place the ignition switch to the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Remove the HVAC/ECAS fuse for a minimum of 10 seconds.
  6. Install the HVAC/ECAS fuse.
  7. Start the vehicle.
  8. Wait 40 seconds for the HVAC control module to self-calibrate.
  9. Verify that no DTCs have set as current DTCs.

Sep 25, 2016 | 2010 Buick Enclave

1 Answer

Where is the fuse for the heater located in a 2008 gmc sierra


Do you have The Automatic or Manual HVAC system ? Doesn't matter fuse's are the same ! Out in the under hood fuse / relay box are two fuse's for heater HVAC BATT fuse #39 10 amp an # 70 40 amp . HVAC BLWR . HVAC = heater ventilation an air conditioning ! So Tom what problem are you having ? Heater fan not working ? There is also a blower motor control module involved !

Feb 09, 2015 | 2008 GMC Sierra 2500HD

1 Answer

What is the fuse labeled Batt Main 3 for on a Pontiac Torrent 2007


i have no idea as never seen this car but if this one of the big 100amp fuses then it could be the alternator --one of the diodes has failed draining the battery

Jan 18, 2015 | Pontiac Cars & Trucks

1 Answer

Driver vent has cold a/c passenger does not


You can start by trying an actuator recalication.(w/o scan tool)

1. clear all DTCs by disconnecting the battery.

2. remove the HVAC/ECAS fuse for a minmum of 10 seconds.

3. install the HVAC/ECAS fuse.

4. start the vehicle.

5. Wait 40 seconds for the HVAC control module to self-calibrate.
If this doesnot work, probably the right actuator is defective. You
will have to replace it. In the center of the HVAC module, there are two actuators, one is on the top part of the module and the other one is Under. The right actuator is the top one.

Jul 09, 2014 | 2009 Chevrolet Silverado 1500

1 Answer

2003 GMC Sierra 1500. I was backing into my driveway and the truck just died. No electrical power at all. None! Could the problem be associated with the anti-theft system?


cud--but test alternator and make sure batt is holden 12.6v at all times--also inspect wiring and chec fuses and maxi fuses under hood--with older cars components wear and gain resistence too causing blacout until vehicle cools down

Oct 06, 2013 | 2003 GMC Sierra 1500

1 Answer

Need to use lock pick to open my 2005 gmc drivers door show directions, key isn't working


hose the lock with some oil or wd40 like stuff and work the key in it. should come free.. dont break the dang key in it!!

Mar 06, 2018 | 2005 GMC Sierra 1500HD

2 Answers

TBC Batt fuse is draining battery after car set 24 hrs what is this fuse for


This fuse is for the body control module, so your draw is probably something controled by the bcm. Get a manusl, get a list, and eliminate them one by one until your draw is gone! Good luck, let me know if you need any more help!

Feb 11, 2012 | 2003 Chevrolet Silverado 1500

1 Answer

I have a draw from my battery how can I find it? I have put a test light in between the neg. post and the cable and the light stays on.I have pull all the fuses one at a time and the light dose not go...


Could be a ground problem; I send you a drain test to check it, you will need a digital volt and ohm meter to perform a battery draw test.

WARNING: Do not attempt this test on a lead-acid battery that has recently been recharged. Explosive gases may cause personal injury. Failure to follow these instructions may result in personal injury.

CAUTION: To prevent damage to the meter, do not crank the engine or operate accessories that draw more than 10A.

NOTE: No factory-equipped vehicle should have more than a 50 mA (0.050 amp) draw.

Check for current drains on the battery in excess of 50 milliamps (0.050 amp) with all the electrical accessories off and the vehicle at rest for at least 40 minutes . Current drains can be tested with the following procedure:

NOTE:
Many electronic modules draw 10 mA (0.010 amp) or more continuously.
Use an in-line ammeter between the negative battery post and its respective cable.

Typically, a drain of approximately one amp can be attributed to an engine compartment lamp, glove compartment lamp, or interior lamp staying on continually. Other component failures or wiring shorts may be located by selectively pulling fuses to pinpoint the location of the current drain. When the current drain is found, the meter reading will fall to an acceptable level. If the drain is still not located after checking all the fuses, it may be due to the generator.

To accurately test the drain on a battery, an in-line digital ammeter must be used. Use of a test lamp or voltmeter is not an accurate method due to the number of electronic modules.

When the battery has been disconnected and reconnected, some abnormal drive symptoms may occur while the powertrain control module (PCM) relearns its fuel trim. The vehicle may need to be driven to relearn the strategy.

Make sure the junction box(es)/fuse panel(s) is accessible without turning on interior or underhood lights. Drive the vehicle at least 5 minutes and over 48 km/h (30 mph) to turn on and activate the vehicle systems.
Allow the vehicle to sit with the key OFF for at least 40 minutes to allow modules to time out/power down.

Connect a fused jumper wire between the negative battery cable and the negative battery post to prevent modules from resetting and to catch capacitive drains.
Disconnect the negative battery cable from the negative battery post without breaking the connection of the jumper wire.

NOTE: It is very important that continuity is not broken between the negative battery post and the negative battery cable when connecting the meter. If this happens, the entire procedure must be repeated. Connect the tester between the negative battery cable and the post. The meter must be capable of reading milliamps and should have a 10 amp capability.

NOTE:
If the meter settings need to be switched or the test leads need to be moved to another jack, the jumper wire must be reinstalled to avoid breaking continuity.
Amperage draw will vary from vehicle to vehicle depending on the equipment package. Compare to a similar vehicle for reference.
No factory-equipped vehicle should have more than a 50 mA (0.050 amp) draw.

Remove the jumper wire. If the draw is found to be excessive, remove fuses from the central junction box one at a time and note the current drop. Do not reinstall the fuses until you are finished testing. To properly isolate each of the circuits, all of the fuses may need to be removed and install one fuse, note the amperage draw, then remove the fuse and install the next fuse, etc.

If the current draw is still excessive, remove the fuses from the battery junction box (BJB) one at a time and note the current drop. Do not reinstall the fuses until you have finished testing. To properly isolate each of the circuits, all of the fuses may need to be removed. After removal of all of the fuses, install one fuse, note the amperage draw, then remove the fuse and install the next fuse until each circuit has been tested. When the current level drops to an acceptable level after removing a fuse, the circuit containing the excessive draw has been located.

Check the wiring schematic in the wiring diagram for any circuits that run from the battery without passing through the junction boxes. This could find in the Service Manual or Haynes books. If the current draw is still excessive, disconnect these circuits until the draw is found. Also disconnect the generator electrical connections if the draw can not be located. The generator may be internally shorted, causing the current drain.

Hope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using Fixya, and have a nice day.

Nov 18, 2011 | 2004 GMC Envoy

1 Answer

2001 GMC Sierra headlights won't come on. Located 3 each 10Amp fuses that were blown and replaced them, however, headlights didn't come on.


what fuses were blown and replaced? Theres a TBC fuse under the hood, along with a Headlamp Relay. Theres a R HDLP and LT HDLP fuses, make sure they are getting power, and are good. If the LT HDLP and RT HDLP fuses are good AND getting power, then the TBC fuse and the relay is good. then I would suspect the Hi-Lo dimmer switch bad. The LOW beam ground wire is YELLOW, the high beam ground is PURPLE. see if high beams work, if they do, then I suspect the dimmer switch is bad.

Dec 17, 2010 | 2001 GMC Sierra Crew Cab

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