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Cruise control fuse # 31 10amp located in the under hood fuse / relay box an HZDFL fuse # 40 15amp located in the center console fuse box . If you pull the plastic side panel off of the right side of the console there is a fuse box inside . If the fuse are good the control module could be bad . Could also be turned off because the ABS has a problem .
DTC P1554 - do you know what a diagnostic trouble code is ?
The powertrain control module (PCM) has the ability to inhibit cruise control operation if conditions exist that would make cruise operation undesirable. The following conditions may inhibit cruise control operation:
• The engine speed is too high or too low.
• The vehicle speed is too high or too low.
• The traction control has been active for longer than 1 second.
• The vehicle acceleration or deceleration rate is too high
If the ABS light is on ,there are DTC'S stored in the system . Your best bet , take it to a GM dealer or someother qualified repair shop.
RR/HVAC fuse 30amp located in the under hood fuse box. You can check it but highly doubt it's the problem . More then like it's the blower motor control module that's bad .
The auxiliary blower motor is a variable speed fan. The HVAC control module controls the fan speed by sending a pulse width modulated signal to the auxiliary blower motor control module. The auxiliary blower motor control module varies the duty cycle across the auxiliary blower motor in relation to the pulse width modulated signal. The auxiliary blower motor speed can be adjusted from 10 percent to 90 percent duty cycle (PWM), 90 percent is high speed fan.
Watch this video for testing purpose's only , this is a front blower motor control module . Same way your back one works . GM is GM Chevy , Buick ,GMC , Cadillac .
In theory once the desired idle speed is programmed into the management system, in the absence of such faults as air leaks, sticking idle air control valve and suchlike it should be impossible for the idle speed to be much different from the programmed value because the ECU should continue closing down the amount of air bypassing the throttle butterfly until the idle is around the correct value.
I think you need to go back to basics and double-check the work to ensure everything is as it should be. In the absence of mechanical faults and ignoring the possibility of electronic problems a high idle must be caused by too much air entering the engine, either because the idle air control valve is not closing properly or because the throttle butterfly is not closing fully.
It is worth noting air can enter the intake through leaky diaphragms, split vacuum hoses or faulty pcv systems. It is also worth checking the egr valve if fitted.
Check with a Dealer for a Recall on the Cruise unit and park the car outside until you do. There were fire hazards for some year models. Get your Vin# checked to see if the upgrade was missed. The Dealers installed an inline fuse to repair these.
Hi Jim, If the vehicle is fitted with climate control it will have electronic management. However it can be wired by someone knowing electrical circuitry to by pass the control. It will save you some cash but will need manual control. Make sure whoever does the job knows what he or she is doing. Have a happy new year. Regards John