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This is an interesting one. However, the idea that the battery gets weak is most likely the cause of all the electrical issues. Have you checked the alternator output to confirm it is working? A good battery can work on its own for awhile, but will eventually fail if not maintained by the alternator. I have to be honest, with the electronics on cars today, low voltage can cause many things to act up.
Also, if the check engine light is coming on, you should have it scanned to see what diagnostic trouble codes are stored in it.
Here is a quick video showing how to scan a computer:
https://youtu.be/YV3TRZwer8k
I realize most people don't own a scanner, but often times a parts store will do it for free or lend / rent you a scanner.
Next, we need to confirm the alternator is doing its job. Here is a link that explains how to check. All you will need is a basic volt meter or multi meter.
https://www.2carpros.com/articles/how-to-check-a-car-alternator
Here are a few links to help:
https://www.2carpros.com/articles/how-to-use-a-voltmeter
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
https://www.2carpros.com/articles/how-to-check-wiring
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Now, before doing anything, first check to make sure the battery terminals are clean and tight. If they are, then proceed with the alternator test. If the alternator fails the test, it will need replaced. If it doesn't fail, let me know.
Here is a link that shows in general how one is replaced:
https://www.2carpros.com/articles/how-to-replace-an-alternator
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Here are the directions specific to your vehicle for alternator / generator replacement. The attached pictures correlate with the directions.
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GENERATOR REPLACEMENT
Generator Replacement (LNJ) (3.4L)
Removal Procedure
pic 1
1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (See: Battery Cable > Removal and Replacement).
2. Remove the drive belt. Refer to Drive Belt Replacement (See: Drive Belt > Removal and Replacement > Drive Belt Replacement).
3. Disconnect the engine wiring harness electrical connector (1) from the generator.
4. Reposition the engine wiring harness boot (4).
5. Remove the generator terminal nut (2).
6. Remove the engine wiring harness terminal lead (3) from the generator.
pic 2
7. Remove the generator bolts (1).
8. Remove the generator (2).
Installation Procedure
pic 3
1. Install the generator (2).
Caution: Refer to Fastener Caution (See: Vehicle > Vehicle Damage Warnings > Fastener Caution).
2. Install the generator bolts (1) and tighten to 50 Nm (37 lb ft).
pic 4
3. Install the engine wiring harness terminal lead (3) to the generator.
4. Install the generator terminal nut (2) and tighten to 20 Nm (15 lb ft).
5. Position the engine wiring harness boot (4).
6. Connect the engine wiring harness electrical connector (1) to the generator.
7. Install the drive belt. Refer to Drive Belt Replacement (See: Drive Belt > Removal and Replacement > Drive Belt Replacement).
8. Install the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (See: Battery Cable > Removal and Replacement).
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Let me know what you find or if you have other questions.
Take care,
Joe
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Saturday, July 6th, 2019 AT 9:27 PM