Hummer H1 The original Hummer, which brought the Hummer look to the public eye during Desert Storm, with the addition of some features that make the H1 more of a street vehicle and less of a Army truck

Shorting pins 4 & 15 on DLC connector to figure out ABS/TT4 light not working

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Old Jun 24, 2022 | 11:53 AM
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darkostoj's Avatar
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Default Shorting pins 4 & 15 on DLC connector to figure out ABS/TT4 light not working

I have a 2003 H1 and the ABS and TT4 light are on. I tried shorting pins 4 & 15 on the DLC connector to see the flashing but I wasn't able to get it to work. Does anyone have any idea how I can start to diagnose what the issue is? It's a nice setup with only 23k miles on it. Thanks!
 
Old Jun 24, 2022 | 02:10 PM
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Cletus's Avatar
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Originally Posted by darkostoj
I have a 2003 H1 and the ABS and TT4 light are on. I tried shorting pins 4 & 15 on the DLC connector to see the flashing but I wasn't able to get it to work. Does anyone have any idea how I can start to diagnose what the issue is? It's a nice setup with only 23k miles on it. Thanks!
  1. I have a similar issue. TT4 and abs light is on.
  2. Any idea what this is telling me.
 
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