B1564

Code

Other B — Body

Door Ajar Circuit Open

Brand: Other

Type: B — Body

Views: UK: 29 EN: 41 RU: 30

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Broken or chafed wiring in the door harness
Disconnected or corroded connector at the door switch or body harness
Failed door ajar (door contact) switch
Incorrectly installed or damaged door switch (aftermarket parts)
Water intrusion/corrosion in switch or connector
Damaged or faulty BCM/input module

Symptoms

Door ajar warning or lamp illuminated on dash with door closed
Interior/dome lights may remain on or not behave normally
Chime or reminder may sound inappropriately
Possible battery drain if interior lights stay on
Door-related functions (auto-lock, alarm, ambient lighting) may not operate correctly

What to check

Visually inspect door switch, latch area, and wiring harness for damage, corrosion, or water intrusion
Check connector at door switch for corrosion, bent pins, or poor engagement
Verify fuse(s) related to body/BCM circuits are intact
Scan for additional body/BCM codes to confirm affected door/input
Attempt to reproduce fault by opening/closing the door while monitoring the indicator or DTC status
Wiggle test harness through door hinge area while watching indicator/DTCs

Signal parameters

Expected behavior: switch signal should change state when door opens/closes (voltage or continuity toggle)
Common voltage ranges: ~0–0.5 V when pulled to ground, ~9–14 V when pulled to battery (system dependent)
Continuity: closed switch should show near 0 Ω continuity between switch terminals; open switch shows infinite/OL
Resistance: typical closed-switch resistance should be very low (

Diagnostic algorithm

Read and record freeze frame/related codes with a scan tool. Clear codes and try to reproduce the fault to confirm persistence.
Visual inspection: check door switch actuator, latch area, switch body, and wiring harness through the door hinge for pinching, chafing, or corrosion.
Inspect and firmly reseat the door switch connector. Inspect pins for corrosion or damage.
With ignition on, back-probe the switch connector and observe signal while opening/closing the door. Verify expected voltage change or continuity change per vehicle design.
If no signal change, test continuity between switch and BCM input pin (with ignition off). Repair any open or high-resistance wiring found.
If wiring and connector are good but switch does not change state, bench-test or replace the door ajar switch. Re-test after replacement.
If new switch and wiring continuity are good but the BCM still reports open, verify power and grounds to BCM, and consider BCM/input module fault — consult wiring diagram and manufacturer procedures before replacing module.
After repairs, clear DTCs, perform function test (multiple door cycles), and confirm no reoccurrence.
Safety note: take care with airbag/door wiring and disconnect battery if required by manufacturer procedures before major repairs.

Likely causes

Disconnected or poorly seated connector at the door switch
Broken wire where harness flexes (door hinge area)
Failed/mechanically stuck door ajar switch
Corroded contacts inside the switch or connector

Fault status

⚠️ Status

Open circuit detected on door ajar input — module not receiving expected door switch signal. Inspect switch, connector, and wiring for open or disconnected condition.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours