Here's why:
* Body Control Module (BCM): The BCM is the "brain" that controls many of the vehicle's non-engine electrical functions, including the power locks, radio, wipers, and other accessories. A faulty BCM can cause multiple seemingly unrelated electrical components to malfunction simultaneously. It's the most likely culprit given the wide range of affected systems.
* Wiring Harness Issues: A short circuit or damaged wire in the main wiring harness could also affect multiple systems. This is less likely than a BCM failure, but possible, especially if there's evidence of rodent damage or previous repairs near the harness.
* Grounding Problems: A poor ground connection can disrupt the electrical flow throughout the vehicle, causing intermittent or complete failures of various systems. This is less probable than a BCM issue given the complete failure of multiple systems.
* Fuse/Relay Problems (less likely): While a blown fuse or failed relay *could* cause one or two of these issues, it's far less likely that a single fuse or relay would control all three independently.
Troubleshooting Steps:
1. Check the obvious: Although you mention the battery in the remote isn't the issue, ensure the vehicle's main battery is properly charged and connected. A low battery can sometimes cause strange electrical problems.
2. Have the BCM scanned: The most important step. A professional mechanic or auto parts store with diagnostic equipment can scan the BCM for fault codes. This will pinpoint the problem if the issue originates in the BCM.
3. Inspect wiring: If a BCM scan doesn't reveal anything, a visual inspection of the main wiring harness, particularly in areas prone to damage (under the dash, near the firewall), should be done to look for any cuts, fraying, or corrosion. This is best done by a mechanic.
4. Check fuses and relays (less promising): While less likely, checking the fuses and relays related to the affected systems (power locks, radio, rear wiper) is a simple diagnostic step.
In summary: The simultaneous failure strongly points towards a problem with your vehicle's Body Control Module (BCM). Have it professionally diagnosed as soon as possible to prevent further issues and potential damage to other electrical components. Repairing or replacing the BCM will likely resolve the problem.
