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Home / DTC / B1320 — Driver door open circuit

B1320 — Driver door open circuit

Detailed page for trouble code B1320.

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Code

B1320

ALFA ROMEO B — Body

Driver door open circuit

Brand: ALFA ROMEO
Type: B — Body
Views: UK: 5 EN: 7 RU: 9
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or shorted wiring in the driver door harness (common at hinge/boot)
  • Corroded, loose or damaged connector/pins at door switch or BCM
  • Failed door jamb/courtesy switch or door latch sensor
  • Poor ground or power supply to the switch circuit
  • Water intrusion or corrosion in door switch/connector
  • Aftermarket alarm/remote wiring interfering with circuit

Symptoms

  • Driver door ajar indicator lamp or message on dash
  • Interior/reading lights remain on or do not behave correctly
  • Central locking or alarm may not behave correctly for driver door
  • Possible battery drain if lights remain on
  • DTC B1320 stored and may be intermittent

What to check

  • Check for stored freeze frame and confirmation count with OEM scan tool
  • Visually inspect driver door harness through the boot for chafing, breaks or water entry
  • Inspect and unplug the driver door switch/connector; look for corrosion or bent pins
  • Perform a wiggle test of the door harness while watching the door-status input on a scan tool or multimeter
  • Measure continuity between the door switch and the body control module pin with harness disconnected (use backprobe at BCM)
  • Check for correct supply voltage and ground at the door switch connector

Signal parameters

  • Typical closed-switch continuity: near 0 Ω (closed to ground) — actual depends on switch design
  • Open-switch resistance: very high (kΩ to infinite) when open
  • Voltage at switch pin with door open: may be near battery voltage or pulled-up to module reference (varies by vehicle)
  • Voltage at switch pin with door closed: often near 0 V if switch grounds the line, or near reference if switch pulls to supply — verify with schematic
  • Door-status on scan tool: binary open/closed (0/1) or percentage for some vehicles — should change state when switch actuated

Diagnostic algorithm

  1. Connect a compatible scan tool and confirm B1320 is present; note freeze frame and occurrence data
  2. Visually inspect the driver door area, door latch, switch and wiring boot for damage or moisture
  3. With connector disconnected, check continuity of the switch itself or resistance across switch terminals while operating the door latch/switch; replace switch if faulty
  4. Backprobe the harness at the body control module (or at an accessible module connector) and verify signal changes when operating the door switch
  5. If the switch is expected to ground the input, verify continuity to ground when closed (
  6. Perform a wiggle test of the door harness through full range of door motion while watching the scan tool for dropouts; repair any broken conductors in the boot
  7. Repair or replace damaged connectors/wiring (solder and heat-shrink or proper crimp repair), protect the harness and re-seal against moisture
  8. Clear code and test-drive; if code returns and wiring/switch is good, consider module input fault and consult manufacturer procedures before replacing BCM

Likely causes

  • Broken wire in flex boot between body and door
  • Connector pin pushed out, bent or corroded at door switch or module
  • Door latch/switch mechanical failure or stuck actuator
  • Moisture intrusion into door switch/connector causing intermittent open circuit

Fault status

⚠️ Status
Stored B1320 — driver door open circuit detected by body control module. Fault may be intermittent or permanent until wiring or switch fault is repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B1321 B1310 B1399 B1200
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Code

B1320

FIAT B — Body

Driver door open circuit

Brand: FIAT
Type: B — Body
Views: UK: 3 EN: 6 RU: 9
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or shorted wiring in the driver door harness (common at hinge/boot)
  • Corroded, loose or damaged connector/pins at door switch or BCM
  • Failed door jamb/courtesy switch or door latch sensor
  • Poor ground or power supply to the switch circuit
  • Water intrusion or corrosion in door switch/connector
  • Aftermarket alarm/remote wiring interfering with circuit

Symptoms

  • Driver door ajar indicator lamp or message on dash
  • Interior/reading lights remain on or do not behave correctly
  • Central locking or alarm may not behave correctly for driver door
  • Possible battery drain if lights remain on
  • DTC B1320 stored and may be intermittent

What to check

  • Check for stored freeze frame and confirmation count with OEM scan tool
  • Visually inspect driver door harness through the boot for chafing, breaks or water entry
  • Inspect and unplug the driver door switch/connector; look for corrosion or bent pins
  • Perform a wiggle test of the door harness while watching the door-status input on a scan tool or multimeter
  • Measure continuity between the door switch and the body control module pin with harness disconnected (use backprobe at BCM)
  • Check for correct supply voltage and ground at the door switch connector

Signal parameters

  • Typical closed-switch continuity: near 0 Ω (closed to ground) — actual depends on switch design
  • Open-switch resistance: very high (kΩ to infinite) when open
  • Voltage at switch pin with door open: may be near battery voltage or pulled-up to module reference (varies by vehicle)
  • Voltage at switch pin with door closed: often near 0 V if switch grounds the line, or near reference if switch pulls to supply — verify with schematic
  • Door-status on scan tool: binary open/closed (0/1) or percentage for some vehicles — should change state when switch actuated

Diagnostic algorithm

  1. Connect a compatible scan tool and confirm B1320 is present; note freeze frame and occurrence data
  2. Visually inspect the driver door area, door latch, switch and wiring boot for damage or moisture
  3. With connector disconnected, check continuity of the switch itself or resistance across switch terminals while operating the door latch/switch; replace switch if faulty
  4. Backprobe the harness at the body control module (or at an accessible module connector) and verify signal changes when operating the door switch
  5. If the switch is expected to ground the input, verify continuity to ground when closed (
  6. Perform a wiggle test of the door harness through full range of door motion while watching the scan tool for dropouts; repair any broken conductors in the boot
  7. Repair or replace damaged connectors/wiring (solder and heat-shrink or proper crimp repair), protect the harness and re-seal against moisture
  8. Clear code and test-drive; if code returns and wiring/switch is good, consider module input fault and consult manufacturer procedures before replacing BCM

Likely causes

  • Broken wire in flex boot between body and door
  • Connector pin pushed out, bent or corroded at door switch or module
  • Door latch/switch mechanical failure or stuck actuator
  • Moisture intrusion into door switch/connector causing intermittent open circuit

Fault status

⚠️ Status
Stored B1320 — driver door open circuit detected by body control module. Fault may be intermittent or permanent until wiring or switch fault is repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B1321 B1310 B1399 B1200
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Code

B1320

MITSUBISHI B — Body

Quarter window cancel current

Brand: MITSUBISHI
Type: B — Body
Views: UK: 6 EN: 11 RU: 16
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or shorted wiring in the driver door harness (common at hinge/boot)
  • Corroded, loose or damaged connector/pins at door switch or BCM
  • Failed door jamb/courtesy switch or door latch sensor
  • Poor ground or power supply to the switch circuit
  • Water intrusion or corrosion in door switch/connector
  • Aftermarket alarm/remote wiring interfering with circuit

Symptoms

  • Driver door ajar indicator lamp or message on dash
  • Interior/reading lights remain on or do not behave correctly
  • Central locking or alarm may not behave correctly for driver door
  • Possible battery drain if lights remain on
  • DTC B1320 stored and may be intermittent

What to check

  • Check for stored freeze frame and confirmation count with OEM scan tool
  • Visually inspect driver door harness through the boot for chafing, breaks or water entry
  • Inspect and unplug the driver door switch/connector; look for corrosion or bent pins
  • Perform a wiggle test of the door harness while watching the door-status input on a scan tool or multimeter
  • Measure continuity between the door switch and the body control module pin with harness disconnected (use backprobe at BCM)
  • Check for correct supply voltage and ground at the door switch connector

Signal parameters

  • Typical closed-switch continuity: near 0 Ω (closed to ground) — actual depends on switch design
  • Open-switch resistance: very high (kΩ to infinite) when open
  • Voltage at switch pin with door open: may be near battery voltage or pulled-up to module reference (varies by vehicle)
  • Voltage at switch pin with door closed: often near 0 V if switch grounds the line, or near reference if switch pulls to supply — verify with schematic
  • Door-status on scan tool: binary open/closed (0/1) or percentage for some vehicles — should change state when switch actuated

Diagnostic algorithm

  1. Connect a compatible scan tool and confirm B1320 is present; note freeze frame and occurrence data
  2. Visually inspect the driver door area, door latch, switch and wiring boot for damage or moisture
  3. With connector disconnected, check continuity of the switch itself or resistance across switch terminals while operating the door latch/switch; replace switch if faulty
  4. Backprobe the harness at the body control module (or at an accessible module connector) and verify signal changes when operating the door switch
  5. If the switch is expected to ground the input, verify continuity to ground when closed (
  6. Perform a wiggle test of the door harness through full range of door motion while watching the scan tool for dropouts; repair any broken conductors in the boot
  7. Repair or replace damaged connectors/wiring (solder and heat-shrink or proper crimp repair), protect the harness and re-seal against moisture
  8. Clear code and test-drive; if code returns and wiring/switch is good, consider module input fault and consult manufacturer procedures before replacing BCM

Likely causes

  • Broken wire in flex boot between body and door
  • Connector pin pushed out, bent or corroded at door switch or module
  • Door latch/switch mechanical failure or stuck actuator
  • Moisture intrusion into door switch/connector causing intermittent open circuit

Fault status

⚠️ Status
Stored B1320 — driver door open circuit detected by body control module. Fault may be intermittent or permanent until wiring or switch fault is repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B1321 B1310 B1399 B1200
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

B1320

Other B — Body

Driver Door Ajar Circuit Open

Brand: Other
Type: B — Body
Views: UK: 14 EN: 28 RU: 29
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Broken or shorted wiring in the driver door harness (common at hinge/boot)
  • Corroded, loose or damaged connector/pins at door switch or BCM
  • Failed door jamb/courtesy switch or door latch sensor
  • Poor ground or power supply to the switch circuit
  • Water intrusion or corrosion in door switch/connector
  • Aftermarket alarm/remote wiring interfering with circuit

Symptoms

  • Driver door ajar indicator lamp or message on dash
  • Interior/reading lights remain on or do not behave correctly
  • Central locking or alarm may not behave correctly for driver door
  • Possible battery drain if lights remain on
  • DTC B1320 stored and may be intermittent

What to check

  • Check for stored freeze frame and confirmation count with OEM scan tool
  • Visually inspect driver door harness through the boot for chafing, breaks or water entry
  • Inspect and unplug the driver door switch/connector; look for corrosion or bent pins
  • Perform a wiggle test of the door harness while watching the door-status input on a scan tool or multimeter
  • Measure continuity between the door switch and the body control module pin with harness disconnected (use backprobe at BCM)
  • Check for correct supply voltage and ground at the door switch connector

Signal parameters

  • Typical closed-switch continuity: near 0 Ω (closed to ground) — actual depends on switch design
  • Open-switch resistance: very high (kΩ to infinite) when open
  • Voltage at switch pin with door open: may be near battery voltage or pulled-up to module reference (varies by vehicle)
  • Voltage at switch pin with door closed: often near 0 V if switch grounds the line, or near reference if switch pulls to supply — verify with schematic
  • Door-status on scan tool: binary open/closed (0/1) or percentage for some vehicles — should change state when switch actuated

Diagnostic algorithm

  1. Connect a compatible scan tool and confirm B1320 is present; note freeze frame and occurrence data
  2. Visually inspect the driver door area, door latch, switch and wiring boot for damage or moisture
  3. With connector disconnected, check continuity of the switch itself or resistance across switch terminals while operating the door latch/switch; replace switch if faulty
  4. Backprobe the harness at the body control module (or at an accessible module connector) and verify signal changes when operating the door switch
  5. If the switch is expected to ground the input, verify continuity to ground when closed (
  6. Perform a wiggle test of the door harness through full range of door motion while watching the scan tool for dropouts; repair any broken conductors in the boot
  7. Repair or replace damaged connectors/wiring (solder and heat-shrink or proper crimp repair), protect the harness and re-seal against moisture
  8. Clear code and test-drive; if code returns and wiring/switch is good, consider module input fault and consult manufacturer procedures before replacing BCM

Likely causes

  • Broken wire in flex boot between body and door
  • Connector pin pushed out, bent or corroded at door switch or module
  • Door latch/switch mechanical failure or stuck actuator
  • Moisture intrusion into door switch/connector causing intermittent open circuit

Fault status

⚠️ Status
Stored B1320 — driver door open circuit detected by body control module. Fault may be intermittent or permanent until wiring or switch fault is repaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5 - 2.0 hours

Similar codes

B1321 B1310 B1399 B1200
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  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

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