B1330

Code

Other B — Body

Passenger Door Ajar Circuit Short To Ground

Brand: Other

Type: B — Body

Views: UK: 29 EN: 48 RU: 48

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Page language: EN

Causes

Chafed or pinched wiring contacting chassis ground
Corroded or damaged passenger door ajar (micro) switch or connector
Water intrusion in door harness or switch area
Aftermarket alarm/lighting accessory incorrectly tied into the circuit
Short in door harness or body harness splice to ground
Faulty BCM or internal input driver failure

Symptoms

Passenger door ajar lamp or message illuminated on dash
Interior/dome light stays on after doors closed
Battery drain when parked
Door ajar indication remains even when door is closed
Possible intermittent operation or loss of central locking on that door

What to check

Read stored codes and freeze-frame with a scan tool; erase and attempt to re-create
Visually inspect passenger door switch, connector, door jamb wiring and grommet for damage or corrosion
Check for water or debris in switch/connector and harness routing through door hinge area
Backprobe the passenger door ajar circuit at the BCM and at the switch while monitoring voltage
Wiggle harness and operate door while watching live data for changes or intermittent shorts
Disconnect the passenger door switch harness and observe if code clears or open/closed state changes

Signal parameters

Expected voltage with switch open: pulled-up voltage (typically vehicle reference — commonly 5–12 V depending on vehicle)
Expected voltage with switch closed: near 0–1 V (grounded)
Switch closed resistance: near 0–2 ohms
Switch open resistance: OL/infinite (or very high) between circuit and ground
Typical circuit current: very low (usually milliamps) — large current indicates a hard short

Diagnostic algorithm

Safety: park vehicle, key off, follow vehicle-specific safe procedures (airbag/aircraft modules where applicable).
Confirm code B1330 with a scan tool and note freeze-frame/live data while reproducing the fault (open/close passenger door).
Visually inspect passenger door latch area, switch and the door harness grommet for pinched wires, corrosion, or water entry. Repair as found.
With the ignition ON, backprobe the passenger door ajar circuit at the switch and at the BCM. Verify voltage: open = pulled-up reference, closed = ~0 V. Record readings.
Disconnect the switch harness at the door. If the BCM input returns to expected open voltage and the code clears, suspect switch or harness in door. If it remains low, suspect short in harness or BCM input.
With BCM connector disconnected (if service manual allows), measure resistance between the switch circuit pin and chassis ground. Low resistance indicates a short to ground in harness or splice. Trace wiring toward chassis and repair.
Wiggle the door harness through full door travel while monitoring the circuit for intermittent shorts; repair/replace damaged section or replace grommet if wires chafe.
Inspect and remove any aftermarket taps or accessories tied into the circuit; disconnect and retest.
Replace the passenger door ajar switch if it fails bench resistance/voltage checks or shows corrosion. Reconnect and clear codes.
If wiring and switch test good and the circuit still reads low only when connected to BCM, consider BCM input failure. Verify BCM power/grounds and consult manufacturer diagnostics before replacing BCM.
After repairs, clear codes and perform road/operational test to confirm the fault does not return.

Likely causes

Wiring insulation rubbed through at hinge/door jamb and contacting body
Failed/shorted door ajar switch due to corrosion or mechanical failure
Connector pins pushed out, bent, or contaminated causing short to ground
Accessory wiring tapped into the switch circuit creating a low-resistance path to ground