Question about 1999 GMC Jimmy
I'm assuming that the blower isn't work in LOW, then with blower control speed at Low, you have no power supply to the yellow wire. Let ma know the following:
1. Do you have power at the Tan wire when blower speed is set at M1?
2. Do you have power at the Light Blue wire when blower speed is set st M2?
3. Does applying battery voltage to the terminal of the resistor at the yellow wire work the blower at low speed?
4. Did you test the HTR fuse ( 25A) in the fuse box?
If you have power on the brown wire coming from the heater 25amp fuse when key is On and when you switch to low the yellow wire should have power-Is this happening if not were right back with HVAC control module. Now if yellow has power ,blower motor should come On-if not-check and test the ground pointG201 at right side of dash.
Keep us uodated.
Posted on Nov 11, 2010
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Posted on Jan 02, 2017
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