B1334

Code

Other B — Body

Decklid Ajar Rear Door Circuit Short To Ground

Brand: Other

Type: B — Body

Views: UK: 27 EN: 44 RU: 34

AI status

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Page language: EN

Causes

Damaged wiring harness with insulation rubbed through, pinched, or chafed to chassis ground
Corroded or bent connector terminals at the decklid latch/sensor or BCM
Faulty decklid/trunk latch switch or sensor internally shorted to ground
Water intrusion in connector causing bridging to ground
Incorrect aftermarket equipment or repair that grounded the circuit
Internal failure in the BCM or module input circuit (less common)

Symptoms

Trunk/decklid ajar warning lamp/indicator illuminated with door closed
Interior/cargo/ dome lamps stay on when vehicle is off
Battery draining or parasitic draw
Central locking may not lock/unlock trunk properly
DTC stored and possibly related limp functionality for convenience features

What to check

Retrieve and record freeze frame and any related codes; clear codes and attempt to reproduce
Visual inspection of decklid latch, wiring harness routing, and connectors for damage, corrosion, or water
Backprobe the decklid ajar circuit at the latch/sensor connector and at the BCM connector while operating the latch
Measure continuity between the ajar circuit and chassis ground with connectors disconnected
Wiggle the harness near the hinge and trunk opening while watching data or lamp behavior
Disconnect the latch/sensor and check if the code clears or changes

Signal parameters

Normal: circuit is typically pulled up inside the BCM or harness; when switch is activated it is pulled to ground—expected voltages depend on vehicle design
Typical voltages: 0–0.5 V indicates a ground; 4.5–5 V or 9–14 V indicates pulled-up/open depending on system (verify vehicle spec)
Continuity to ground should be present only when the latch/switch is commanded closed (if switch is ground-switched)
Resistance from circuit to chassis ground should be very high (open) with connectors disconnected and switch open

Diagnostic algorithm

Record codes, clear them, then operate decklid and re-scan to confirm repeatability.
Visually inspect the decklid latch and harness along the trunk hinge area for chafing, broken wires, pinched sections, or corrosion. Repair obvious damage.
With ignition ON, backprobe the decklid ajar wire at the latch connector. Observe voltage with latch open and closed. Compare to expected behavior (open = pulled-up voltage, closed = near 0 V if switch grounds).
If the circuit reads ground (0 V) when it should be open, disconnect the latch/sensor. If voltage returns to pulled-up when disconnected, suspect latch internal short or short in harness between latch and connector.
If circuit remains grounded with latch disconnected, isolate wiring by unplugging intermediate connectors toward the module until the ground goes away. Repair the shorted section.
Perform a continuity test between the ajar circuit and chassis ground with connectors disconnected. Low resistance indicates a short to ground.
Wiggle harness and flex trunk while watching voltage or DTC status to locate intermittent shorts at the hinge or routing points.
If wiring and latch check good, test/inspect BCM input pin for damage. If module input is suspected, consult manufacturer diagnostics and consider module bench testing or replacement.
After repairs, clear codes and verify proper operation over several open/close cycles. Confirm no parasitic draw and that dome/aja r indicators behave normally.

Likely causes

Wiring rub-through at hinge, trunk opening, or body sheet-metal
Connector corrosion at latch or body harness connector
Failed latch/sensor assembly (shorted switch)
Accessory or previous repair created a ground splice on the circuit

Fault status

⚠️ Status

Decklid (rear door) ajar circuit detected short to ground — module input is seeing an unintended ground condition on the trunk/decklid ajar sensor circuit.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours