2005 GMC C3500 SERIAL DATA

Tiny
NBS AUTO REPAIR
  • MEMBER
  • 2005 GMC C3500
  • V8
  • 2WD
  • AUTOMATIC
  • 35,000 MILES
HOW DO WE MONITOR A SERIAL DATA LINE WITHOUT USING A SCAN TOOL
Friday, February 13th, 2009 AT 7:04 AM

1 Reply

Tiny
BRIAN 1
  • MECHANIC
  • 1,030 POSTS
Its hard to do without a scan tool but I will help as best I can. Follow this info, Key in the off position

2) Use a dvom while reading resistance, put one lead with the correct probes on pin 6 of the aldl diagnostic connector and put the other lead on pin 14 at the dlc.

3) Measure the resistance results

If the resistance is out of limits (ol), look for a open in circuits 2500 or 2501 that runs from the dlc to the bcm on the LAN bus as per the wiring schematic. Repair as necessary.

4) The resistance value should be approximately 60 ohms +/- 10%. What problem are you having? No communication? Need some more info. Are you having a problem with the high and low speed LAN communication bus?Post back with any other questions.
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Friday, February 13th, 2009 AT 11:11 AM

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