1. Neutral Safety Switch (NSS):
* What it does: This switch prevents the car from starting unless it's in Park or Neutral. If it's malfunctioning, it might be sending a signal that the car is in reverse even when it's in park. This is the most likely culprit given your symptoms.
* Troubleshooting:
* Check the shifter: Make absolutely sure the shifter is firmly in Park. Sometimes a slightly loose shifter can cause issues with the NSS.
* Inspect the NSS: The NSS is usually located on the transmission. It's a small switch and can be difficult to access, depending on the Bravada's setup. You might need to consult a repair manual for your specific vehicle. Visually inspect it for damage or loose connections.
* Test the NSS: This requires a multimeter to check the continuity of the switch in different gear positions. A repair manual will guide you through the correct testing procedure. This is more advanced and might require some electrical knowledge.
* Replacement: If the NSS is faulty, it'll need replacement. This is often a relatively straightforward repair, but might require some mechanical skill.
2. Wiring Issues:
* Damaged or corroded wiring: Wires leading to or from the NSS, or within the transmission shift linkage, can be damaged, corroded, or shorted. This can lead to incorrect signals being sent to the starting system.
* Troubleshooting: This requires carefully inspecting the wiring harness leading to and from the NSS and the related components. Look for any broken, frayed, or corroded wires. Repair or replace any damaged wiring.
3. Other less likely possibilities:
* Low battery: While less likely given the reverse lights are on, a very low battery could still prevent the car from cranking. Check the battery voltage.
* Starter motor problems: A faulty starter motor could prevent cranking, but it's less likely to be directly related to the reverse lights being on.
* Ignition switch issue: A problem with the ignition switch could also prevent starting.
What to do:
1. Safety first: Don't attempt any repairs unless you're comfortable working on cars. If you're not sure, take it to a qualified mechanic.
2. Start simple: Ensure the shifter is firmly in Park. Check the battery voltage.
3. Consult a repair manual: A repair manual specific to your 2000 Oldsmobile Bravada will be invaluable in diagnosing and fixing the problem. It will show you diagrams of the wiring, the location of the NSS, and testing procedures.
4. Professional help: If you're not comfortable troubleshooting electrical issues, take your Bravada to a mechanic. The reverse lights being on in park is a strong indicator of an electrical fault that requires professional attention. Ignoring this could lead to further damage.
The reverse lights being on in park is a crucial clue—it's not just a simple starting problem. Address the underlying electrical issue to avoid further complications.
