The blower engine does not work/blow air. I have tried one more electronic temperature control panel and also a relay because that the blower engine itself however to no avail. I eliminated the blower motor and also tested it straight with 12v power and also it moves like it should. Is there maybe a ground wire the has damaged or can have come off? This difficulty does not blow fuses and the electric system in this auto is solid, minus this issue.


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correct it is referred to as the blower motor resistor (called the blower engine controller on schematics) most likely that is your problem but I'm sending you the diagnostics procedure simply in instance you require itThis overview cane aid us fix it.https://www.6294.org/articles/blower-fan-motor-works-on-high-speed-only1999 Jeep cool Cherokee 4.0L Eng LaredoVehicle Reference: HVAC solution - AUTOMATICSYMPTOM DIAGNOSIS > BLOWER motor INOPERATIVEPossible causes: blower motor controller ground circuit open, strength Distribution facility (PDC) fuse No. 1 blown, defective blower motor. Blower engine voltage it is provided circuit open/shorted to round, blower motor manage circuit open/shorted come ground, blower motor controller defective, defective AZC module (no PWM signal), defective AZC module (PWM signal sent, blower high), blower motor regulate circuit shorted come blower motor ground circuit, or blower motor manage circuit shorted to B+ (battery voltage). Revolve ignition off. Remove and also inspect power Distribution facility (PDC) fuse No. 1. If fuse is blown, change fuse and also check for a short circuit. If fuse is okay, walk to following step. Disconnect blower engine controller connector. Inspect connector and repair together necessary. Measure resistance in between blower engine voltage it is provided circuit and also ground. If resistance is much less than 5 ohms, repair short circuit to ground. Calibrate HVAC system. Check out BODY confirmation TEST VER-2A under PROGRAMMING. If resistance is greater than 5 ohms, go to following step. Rotate ignition off and also disconnect blower motor. Utilizing a known-good battery, apply voltage directly to blower motor. If blower motor operation properly, walk to next step. If blower engine is inoperative, make sure blower motor is no obstructed. Fix or replace blower motor together necessary. Disconnect blower motor controller. Check connector and repair as necessary. Measure up resistance between ground and blower engine controller soil circuit. If resistance is much less than 5 ohms, go to next step. If resistance is higher than 5 ohms, repair open ground circuit. Revolve ignition on (engine off). For sure blower switch is off. Disconnect blower motor controller. Examine connector and repair together necessary. Rotate setting selector switch to defrost position, transforming front defroster on. Rotate blower switch to high (manual override). Inspect voltage in ~ blower motor voltage supply circuit. If voltage is better than 10.0 volts, walk to following step. If voltage is less than 10.0 volts. Repair open up blower motor voltage supply circuit. Calibrate HVAC system. Watch BODY verification TEST VER-2A under PROGRAMMING. Rotate ignition off and disconnect blower motor. Disconnect AZC module connector. Inspect connectors and also repair as necessary. Measure up resistance in between blower motor manage circuit and ground. If resistance is much less than 5 ohms, repair short circuit come ground. Calibrate HVAC system. See BODY confirmation TEST VER-2A under PROGRAMMING. If resistance is greater than 5 ohms, go to next step. Disconnect blower engine controller connector. Disconnect AZC module connector. Inspect connectors and repair together necessary. Measure up resistance of blower motor regulate circuit between blower engine controller and also AZC module C2 connector. View WIRING DIAGRAMS . If resistance is higher than 5 ohms, repair open blower motor control circuit. If resistance is much less than 5 ohms, go to next step. Turn ignition off. Disconnect blower motor controller connector. Examine connector and also repair as necessary. Revolve ignition on. Measure voltage in between ground and blower motor manage circuit at blower motor controller 3-pin connector. If voltage is better than 0.5 volts, repair brief to battery voltage in blower motor manage circuit. Calibrate HVAC system. Check out BODY verification TEST VER-2A under PROGRAMMING. If voltage is less than 0.5 volts, go to following step. Rotate ignition off. Disconnect blower engine controller connector. Disconnect Heater Ventilation A/C (HVAC) body harness connector (C202). Examine connectors and repair as necessary. Measure resistance between blower motor regulate circuit and blower engine ground circuit. If resistance is much less than 5 ohms, repair brief to floor in blower motor control circuit. Calibrate HVAC system. View BODY confirmation TEST VER-2A under PROGRAMMING. If resistance is greater than 5 ohms, walk to next step. Turn ignition on. Using DRB lab scope, select LIVE DAT, AUTO SET-UP, collection the TIME department to 20MS/DIV. Set voltage variety to variety 10.0 VOLTS. Backprobe blower motor regulate circuit in ~ blower motor controller 3-pin connector through blower motor switch in LO (manual override) and mode pick switch in defrost mode. The voltage pattern must cycle from about 0.5 volts up to 5.0 volts in low speed fan position. If voltage pattern is cycling as specified, go to following step. If voltage pattern is no cycling together specified, change defective AZC module. Through lab scope as in step 10) , backprobe blower motor manage circuit at blower motor controller 3-pin connector v blower motor switch in hi (manual override) and mode choose switch in defrost mode. The laboratory scope pattern must be flattened. Now change the rap scope voltage setup to selection 2.0 VOLTS. The voltage pattern must cycle up to about 0.3 volts through blower engine in high pan speed. If voltage pattern is as specified, walk to following step. If voltage pattern is not as specified, replace AZC module. Disconnect blower motor. Examine connector and repair together necessary. Revolve ignition on. Location blower switch on HI and also mode selector move to defrost mode. Attach a test light throughout blower motor wiring exploit 2-pin connector. If test light comes on brightly, check is complete.

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If test light does not come ~ above brightly, replace blower motor controller.