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1999 Chevrolet Silverado 1500 Question: Tow/Haul Function - Switch replaced still not working

 

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das86turbo, Evergreen, CO, March 17, 2013, 09:11
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I replaced the infamous stem mounted switch that controls the haul/tow function and the tranny still will not go into haul mode. The new wiring appears intact. The original switch when removed had the wires broke as is common on this failure. Prior to replacing the switch I tried jumpering the 2-pin contact to see if it would go into haul mode. This was not successful in getting the tranny to flip to haul mode. I replaced the switch anyway. Is there a module mounted on the tranny that I can jumper or troubleshoot? If the switch is operating what next to check? Also, could my jumpering the switch caused a problem?
Thanks

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