1. Check the Bulbs:
* Obvious First Step: This is the simplest and most common cause. Check both the left and right brake light bulbs. Make sure they are firmly seated in their sockets. While you're at it, inspect the bulbs for filament breakage. Replace any burnt-out bulbs.
2. Check the Fuses:
* Locate the Fuse Box: Your Jeep Cherokee will have a fuse box (or multiple) – typically under the hood and sometimes inside the cabin (often near the steering column). Consult your owner's manual to locate the fuse box(es) and identify the fuse(s) for the brake lights.
* Inspect the Fuses: Carefully examine the fuses for any blown elements (a broken wire inside the fuse). Replace any blown fuses with fuses of the *same amperage rating*. If a fuse blows immediately after replacement, there's a short circuit somewhere in the system (see below).
3. Inspect the Brake Light Switch:
* Location: The brake light switch is usually located on the brake pedal assembly. It's a small switch that activates when you press the brake pedal.
* Testing: This is the most likely culprit in your scenario.
* Visual Inspection: Look for any visible damage or loose wiring connections to the switch.
* Continuity Test (Requires Multimeter): With the brake pedal *released*, there should be no continuity (open circuit) between the terminals of the brake light switch. When you press the brake pedal, there *should* be continuity (closed circuit). If not, the switch is faulty and needs replacement. You can test this with a simple multimeter set to continuity mode.
* Direct Testing (Alternative): If you don't have a multimeter, you can temporarily bypass the switch (carefully!) to see if it's the problem. Connect the wires going to the switch together with a short jumper wire. *Only do this briefly while someone is watching the brake lights to ensure the rest of the circuit works and it's not a short.*
4. Wiring Issues:
* Check for Broken or Damaged Wiring: Examine the wiring harness running from the brake light switch to the taillights for any signs of damage, fraying, or corrosion, particularly near the brake pedal and the taillights themselves. Look for breaks in the wire insulation.
* Ground Connection: A poor ground connection can also prevent the brake lights from working. Ensure the ground wires at the taillights are clean and making good contact with the vehicle's body.
5. Consider the Brake Light Relay:
* Some Jeeps use a relay for the brake lights. It's less common than the switch being the issue, but it is possible. You'll need to refer to your owner's manual to see if your model uses one and where it's located.
Important Notes:
* Safety First: Always disconnect the negative terminal of your battery before working on any electrical components in your vehicle.
* Owner's Manual: Your owner's manual will have diagrams and information specific to your 1997 Jeep Cherokee, including fuse box locations and wiring diagrams.
* Professional Help: If you are not comfortable working on your vehicle's electrical system, it's best to take it to a qualified mechanic.
By systematically checking these areas, you should be able to pinpoint the cause of the brake light malfunction. Remember, the fact that your hazard and turn signals work suggests the problem is isolated to the brake light circuit itself.
