Code
B1322
ALFA ROMEO
B — Body
Driver-side door open switch short to ground
Views:
UK: 3
EN: 4
RU: 6
AI status
Completed
Completed
100%
Causes
- Damaged or corroded door switch
- Chafed or pinched wiring harness contacting chassis ground
- Water intrusion in connector causing low resistance to ground
- Faulty or damaged connector/terminal
- Short in accessory or aftermarket wiring (alarm, audio)
- Faulty body control module input (less common)
Symptoms
- Driver-door indicator permanently shows open or inoperative
- Interior lights remain on or do not behave correctly
- Door ajar warning lamp or chime operates incorrectly
- Central locking or alarm behaves unpredictably
- Possible battery drain if circuit forces lights/BCM logic active
What to check
- Read and record freeze-frame and live data for door switch status from BCM
- Visually inspect driver door switch and connector for damage, corrosion, moisture
- Inspect wiring through door hinge grommet for chafing or exposed conductor
- Disconnect the door switch connector and check circuit voltage/continuity
- Perform wiggle test on wiring while monitoring live data to reproduce fault
- Check for aftermarket devices spliced into door switch circuit
Signal parameters
- Expected: circuit toggles between battery voltage (~9–14 V with ignition on) and low (near 0 V) depending on switch state
- Fault symptom: signal stuck low/near 0 V indicating a hard short to ground
- Expected switch resistance: low ohms to ground when switch commanded closed; high/infinite when open (verify with wiring diagram for exact behavior)
Diagnostic algorithm
- Connect an OEM-capable scan tool. Confirm B1322 is current or historic and capture live door-switch status while operating the driver door.
- Perform a visual inspection of the driver-door area: switch, connector, door panel, grommet at hinge, and harness routing for obvious damage or moisture.
- With ignition off, disconnect the driver-door switch connector. Measure resistance between the switch signal wire (at the harness side) and chassis ground. A low resistance indicates a short in the harness or at a splice.
- With ignition on, backprobe the harness signal wire (connector to BCM side) and measure voltage while opening/closing the door. The signal should change state. If it remains near 0 V, the harness or BCM input is pulling low.
- If a short to ground is indicated, isolate by disconnecting sections: unplug any intermediate connectors (door sill, hinge connectors). Re-test to find which segment shows the short.
- Inspect/replace damaged wiring or repair with proper soldering or quality crimping and heat-shrink protection. Replace switch if it tests faulty or shows corrosion.
- After repair, reconnect everything, clear codes, and verify the door switch reports correctly in live data and that related functions operate normally. Road test and re-check for reoccurrence.
- If harness and switch check good but fault persists, test BCM input pin for internal short or consult manufacturer procedures for BCM diagnosis.
Likely causes
- Broken insulation where harness passes through door hinge or grommet
- Corroded switch plunger or terminals inside switch
- Connector with bent pins making contact with ground
- Water ingress inside door causing bridging to ground
Fault status
Status
Driver-side door open switch circuit shorted to ground (low voltage) detected by BCM. Fault stored; may be present continuously or intermittently.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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