Where the pcm location

Here is the manual https://www.google.com/url?sa=t&source=web&rct=j&url=http://ww2.ac-poitiers.fr/vehicules-materiels/sites/vehicules-materiels/IMG/pdf/schematique_din-2. pdf & ved = 2ahUKEwiuwLXBm_jsAhWRnxQKHZA1B6gQFjAKegQI

remove the left rear quarter trim panel.
remove the auxilairy heater case from the vehicule
remove the retainers from the bottom of the heater case
remove the heater core from the case.

to remove the left rear quarter trim panel,

remove the passenger seats as needed
grasp and gently pull the body side rear trim panel in order to
disengage the retaining clips
remove the body side rear trim from the vehicule

the PCM control it, base on engine rpm,map sensor(load on engine) vehicule speed,engine temp,
PCM take action base on those input and light on
hope it helps

CHECK FOR ANY LEAKS UNDER THE VEHICULE .IF NO LEAKS HAVE SOMEONE HELP YOU ONE PERSON UNDER THE VEHICULE AND THE OTHER INSIDE THE VEHICULE ON DRIVERS SIDE THE ONE UNDER THE VEHICULE WILL BLEED THE LINES AND THE ONE INSIDE WILL PRESS THE BRAKE PEDAL SEVERAL TIMES EACH TIME HE IS ASKED TO DO SO AND LEAVE HIS FOOT ON THE BRAKES ALL THE WAY DOWN SO THAT THE AIR GOES OUT MUST DO THIS ON ALL THE FOUR WHEEL S

contact GM dealer they will tell you if yes or not but have your VIN ready Vehicule Identification Number
hope it help

Generally speaking for any cars it's relatively obvious to find out the distributor cap by following the path from any spark plug wire form the plug to its origin.

In your specific case I expect that you doesn't have traditional distribution cap meaning that you can't adjust the timing this task being assumed automatically by your vehicule PCM.

In any ways you will adjust the timing by the timing belt positionning unless the belt is bad and jumped. If it's the situation the belt has to be replaced and a new one installed with the proper cam and crank synchro.

Why would you like to set your timing? Is your check engine light turned on?
Let us know more about the symptoms.

rear oxygen sensor heater circuit malfunctiion.
standard code definition for all the vehicules.
I'm not a Subaru specialist but you your vehicule could be equipped with two oxygen sensors. The front one located into/near the engine exhaust manifold and the rear one located near the catalytic converter.
The specific code you're getting is associated to the rear one.
First check the wiring and connection of your rear sensor for burned wire or corrosion/dirty in the connector. If the unit has never been replaced and your millage is around/over 100,000 mile, it's easy to think that your unit could be bad and must be replaced.
Easy to replace by yourself as long as you have the right wrench size fiiting the the bottom like nut seat.

Hope it will help
Sorry for my englis
Dan

It is NOT the motor itself in this case, it is the blower motor's resistor pack, which was and seems still is a common problem with the grand cherokees. It is usually located under or behind the glove box right on the firewall, and some rarer cases under the hood, also on the firewall but on the hood side and not the inside of the vehicule, next to the blower motor assembly. In your case it should be located inside the vehicule and requires removal of the glove box according to a few tech experts on the web. Here is the section of tech info i have found which i think will be the most useful for you:

"Get to the blower motor in a Grand Cherokee by first disabling the airbags. Unscrew the glove box and remove it. Unscrew and remove the blower motor wire harness found directly behind the blower motor. Unscrew three screws holding the blower motor into place and then remove the motor."

So I hope this helps you out.

you will need to unplug the suspected bad injector. Then using a multi-meter on the lowest ohm setting check the resistance between both pins. A good working injector has a range of 12-15 ohms. If the resistance is higher just replace the injector.

You should check with a scanner to retrive the codes the PCM register,depending the code you can either send the vehicule to a mecanic or to a GM dealer for repair.Do not desconnect the battery anymore or you'll loose all the PCM codes and it will be difficult to find the exact problem.luck!