B1322

Driver Door Ajar Circuit Short To Ground

Body Chassis/Safety Door Ajar Sensor Circuit 🟢 Low — Fix at next service ✅ Safe to Drive
💬

What This Actually Means

In plain language — no jargon

The driver's door ajar sensor circuit is shorted to ground, meaning the electrical signal wire is touching a metal part and draining power instead of sending proper signals. It's like a leaky water pipe where water escapes instead of flowing where it's supposed to go.

⚡

Symptoms You May Notice

3 known symptoms for this code
Door ajar warning light stays on continuously
Interior dome light remains on when door is closed
Keyless entry or power lock system malfunctions
🔬

How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors the driver door ajar switch circuit voltage to detect open and closed door states. When the door is closed, the switch should provide a specific voltage signal; a short to ground pulls this voltage to zero, triggering a fault. The ECU compares the actual voltage against expected thresholds to confirm the short condition.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Door Switch Voltage 4.5V - 5.0V (closed) or 0V with pull-down when open Continuous 0V when door is closed (short to ground)
Circuit Resistance 10kΩ - 50kΩ (switch open state) <1kΩ (short detected)
🔧

Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Door ajar switch connector
Inspect the connector at the driver door frame for corrosion, moisture, or loose pins and clean or reseat it.
2
Door ajar switch wiring harness
Check the wiring harness along the door jamb for damaged insulation, pinched wires, or exposed conductors touching metal.
3
Door ajar switch assembly
Replace the faulty switch if corrosion or internal damage is found after inspecting the connector and wiring.
⚠️

When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1322 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.
🔄

How to Clear Code B1322

What happens after you fix the fault

Once the fault is repaired, B1322 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When
  • Fault has been diagnosed and repaired
  • You want to confirm the repair worked
  • Code appeared after a sensor was cleaned
⚠️ Do Not Clear When
  • Preparing for an emissions/PUC test
  • Root cause is still undiagnosed
  • Check engine light is flashing
Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.