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Connect amp meter to battery, by removing battery terminal and put one test probe of meter on battery terminal and the other on battery terminal. with vehicle turned off anything higher than approx. 25 mA, 0.025Amps is high. depending on vehicle electronics. start removing fuses one at a time to find concerned circuit that is drawing high current. then find out what else is on circuit and disconnect one at a time with the fuse back in modules, motors, radios, etc... or what ever the fuse supplys power to until you find the culprit.
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Check that altinator belt is tight enough, it should be able to move 1/2" up and down on the side with greatest distance between pulleys, if the belt is tight enough the alternator may be damaged or faulty. Hope this helps
code p 1625 refers to CAN databus, TCM--incorrect signal===causes --TCM trouble code/s stored---TCM incorrectly coded---wiring---matching resistor in ECM
I don't have a listing for code p 1749 but codes 1748 and 1750 are concerned with TCM defective and voltage supply low
so after you check the wiring and connections form the transmission you have 2 options
use a known good ECM to replace yours ( will eliminate any ECM faults)
and/or replace the TCM module on the transmission
Ignition switch , possibly . GM had ignition switch issues . Plus GM had instrument cluster issues as well . Have you ever heard of silver migration in electronic componets with solder connections ? Have a video for you to watch , from a auto repair Tech. has his own shop .Instrument cluster draining the battery ! Chevrolet Truck Battery Dies Overnight Part Chevrolet Truck Battery Dies Overnight Part II
Code 1625 is for a problem with the radiator fan relay. The relay could be faulty, or the radiator fan may not be functional. The components and circuits would need to be checked out.
On most GM models you have a main cable from the alternator to the starter or battery, and a small wire that goes to the instrument cluster. The small wire energizes the alternator. And the large wire should have a fuse or a fuseable link for protection. Are you getting battery power at the large terminal, and is the small terminal hot when the key switch is on ?
The battery drain can any number things such as; vanity mirror or glovebox lights staying on, defective modules, stuck brake light switch, etc. A technician would have to go through all of the electrical circuits to measure for any unusual current draw.
P1625 means that the engine computer has lost communication with the antilock brake and/or traction control computer for at least 3 seconds. How expensive this is depends on why it has lost communication, It could be something as simple as a loose connection at a wiring connector or a broken or shorted wire in the PCI bus circuit inside the wiring harness. (Which may require considerable diagnostic time to find) or it could be an internally failed ABS module.
Recommendation: If you are NOT experiencing ANY of the symptoms below, I would simply clear the code and move on.... It is an intermittent fault that you will most likely not find very easily. If you ARE experiencing ONE OR MORE of these symptoms, then the problem needs to be diagnosed by checking the ABS module's ability to communicate with a scanner while testing the PCI Bus circuits.
Other possible symptoms of Diagnostic Trouble Code (DTC) P1625
• Speedometer malfunctioning • Traction Control malfunctioning • Antilock Brake System malfunctioning or ABS light on • Cruise Control malfunctioning
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