B1333 — Decklid Ajar Rear Door Circuit Short To Battery #

Note: The code label and description may vary between vehicle manufacturers.

• Decklid Ajar Rear Door Circuit Short To Battery (Generic, Ford, Lincoln, Mercury)
• Trunk Lid Ajar Switch Circuit High (General Motors)
• Rear Hatch Open Signal Circuit Short to B+ (Toyota/Lexus)
• Liftgate Ajar Switch Circuit Voltage High (Chrysler/Jeep/Dodge)

Summary of Code B1333 #

The B1333 diagnostic trouble code (DTC) signals a problem in the decklid ajar (trunk or rear door open) switch circuit, specifically a short to battery condition. In plain terms, the vehicle’s control module has detected that the wiring or switch meant to detect whether the trunk or rear door is closed is inadvertently receiving battery voltage when it should not. This can confuse the system, leading to false open/closed readings. Typically, this code is stored by the Body Control Module (BCM) or a similar body electronics controller. Prompt attention helps maintain correct operation of trunk-related features and avoids drained batteries or security vulnerabilities.

Common Symptoms for Code B1333 #

A B1333 code can result in a surprising number of issues, some of which seem trivial until they interfere with your daily routine or drain your battery overnight. Here’s what you might notice:

• Trunk or rear door ajar warning light stays ON or flickers
• Alarm or security system triggering unexpectedly
• Trunk/rear door interior lights stay illuminated
• Remote trunk release not working
• Battery drain if lights or systems remain active
• Trunk/rear door not locking or unlocking correctly

Most Likely Causes for Code B1333 #

When you see B1333 appear, think of it as your vehicle’s way of crying out: “Something’s crossed wires in my trunk!” Here’s what most often triggers this code, in order of likelihood:

1. Damaged or pinched wiring at the trunk/rear door hinge area
2. Decklid ajar switch (the sensor that detects trunk open/closed) is shorted internally
3. Water intrusion or corrosion in trunk wiring or connectors
4. Incorrect installation of aftermarket accessories (e.g., remote starters, security systems) interfering with circuit
5. Faulty Body Control Module (BCM) (rare)

Step-by-Step Diagnosis for Code B1333 #

Diagnosing B1333 means methodically working from the obvious (damaged wires) to the rare (faulty control module). Here’s a proven workflow:

1. Scan for related DTCs. Note if any other body or electrical codes are present.
2. Visually inspect trunk/rear door wiring, especially at flex points (hinges, grommets).
3. Check the decklid ajar switch: Disconnect it and inspect for corrosion or moisture.
4. Test the circuit voltage: With the switch disconnected, use a multimeter to check for battery voltage where it shouldn’t be.
5. Inspect connectors: Look for loose, damaged, or corroded pins at the switch and BCM.
6. Check for aftermarket wiring: Verify no extra wires are spliced into the decklid circuit.
7. Test the BCM: If all else passes, consult OEM data and test the control module’s input/output for the circuit.

Possible Repairs for Code B1333 #

Your repair path will depend on what the diagnosis reveals. Here are the most common solutions matched to typical causes:

• Repair or replace damaged wiring at hinge or trunk area
• Replace the decklid ajar switch if faulty or shorted
• Clean or replace corroded connectors
• Remove or properly install aftermarket wiring to prevent interference
• Replace the BCM only if all wiring and switch checks pass and module is conclusively faulty (rare scenario)

Is It Safe to Drive With Code B1333? #

Yes, you can generally drive with code B1333, but with limitations. While the code itself won’t disable your vehicle, it may lead to annoying side effects like a trunk ajar warning, battery drain (if lights stay on), or compromised security. If you notice your battery dying or if your alarm keeps going off, address the code promptly to avoid being stranded.

Vehicles Most Commonly Affected by Code B1333 #

B1333 is most often reported on vehicles with electronic trunk or liftgate monitoring, especially those from the following OEMs:

• Ford (Focus, Fusion, Taurus, Escape, Explorer)
• Lincoln (MKZ, MKC, Navigator)
• Mercury (Milan, Mariner)
• General Motors (Chevrolet Malibu, Impala, Equinox)
• Toyota/Lexus (Camry, Avalon, RX Series)
• Chrysler/Jeep/Dodge (300, Pacifica, Grand Cherokee)

Common Mistakes & Best Practices for B1333 #

Troubleshooting body codes like B1333 can lead even seasoned techs astray. Here’s what to watch for:

• Replacing the switch without checking wiring first — Always inspect harnesses at flex points.
• Overlooking water damage — Trunk leaks can corrode both switches and connectors.
• Ignoring aftermarket modifications — Incorrectly tapped wiring can confuse the circuit.
• Skipping voltage checks — Confirm battery voltage isn’t present where it shouldn’t be.
• Failing to clear the code after repair — Always reset the code and verify the fix holds.

Quick FAQ for B1333 #

Q: Will this code cause my trunk to stop working completely?
A: Not always. The trunk may still open and close, but you may get false open/closed warnings or erratic alarm behavior.

Q: Can I fix B1333 myself?
A: If you’re comfortable with basic wiring checks and can safely use a multimeter, you might address obvious wiring or switch faults. Otherwise, a professional technician is recommended for advanced diagnosis.