B1328

Code

Other B — Body

Passenger Door Ajar Circuit Open

Brand: Other

Type: B — Body

Views: UK: 36 EN: 87 RU: 53

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Page language: EN

Causes

Broken or disconnected wiring between passenger door latch/sensor and BCM
Corroded or loose connector at door latch or body harness
Failed door ajar/latch switch (mechanical or sensor failure)
Blown fuse or power/ground issue feeding the circuit
Faulty BCM or poor BCM connector terminal

Symptoms

Passenger door ajar warning lamp or message illuminated
Interior lights stay on or come on unexpectedly
Key-in-ignition or chime stays active
Battery drain when vehicle is parked
Central locking/auto-lock features behave incorrectly for passenger door

What to check

Scan for stored/configure DTCs and freeze frame data; note related body codes
Visually inspect door latch connector, wiring along the door hinge, and BCM connector
Operate the passenger door while watching the door-ajar indicator or live data
Check fuses supplying the BCM/door circuits
Perform a wiggle test of wiring in the hinge area while monitoring signal

Signal parameters

Typical closed switch: near 0 ohms (continuity) between switch terminal and ground or expected reference
Typical open switch: very high resistance (open circuit / OL) or floating voltage
Typical voltage when circuit is pulled up by BCM: approx. 5 V or ignition feed voltage depending on design
Expected behavior: change of state when door is opened/closed (switch toggles between closed and open)

Diagnostic algorithm

Verify complaint and read/record all related DTCs. Note whether code is current or historic.
Inspect the passenger door latch area and connector for damage, corrosion, or water intrusion. Check wiring through the door hinge boot for chafing.
With a multimeter, check for proper fused power and ground at the door module/BCM circuits related to door-ajar sensing.
Backprobe the door ajar switch connector and observe voltage or continuity while opening and closing the door. Confirm the switch changes state.
If the switch shows open continuously, disconnect the switch and measure resistance across its terminals to confirm failure. Replace switch if defective.
If the switch is good, perform continuity/short-to-ground tests from the switch harness to the BCM connector. Repair any open or shorted wires found.
Check for aftermarket device splices or recent body repairs that may have disturbed wiring. Repair soldered or crimped connections as needed.
After repairs, clear the DTCs and cycle the door open/close several times. Re-scan and test drive to confirm the code does not return.
If wiring and switch check good but the code persists, consider BCM connector inspection and BCM bench diagnosis or replacement as a last resort.

Likely causes

Damaged wiring at the door hinge (flex area) from repeated opening/closing
Corrosion or bent pins in the door latch connector
Door latch switch failed due to wear or contamination
Connector pushed out or not fully seated after service
Aftermarket alarm/remote wiring interfering with the circuit

Fault status

⚠️ Status

B1328 - Passenger Door Ajar Circuit Open: The body control module has detected an open circuit or loss of signal on the passenger door ajar/latch sensor circuit.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2 hours