Code
B1328
ALFA ROMEO
B — Body
Passenger door open circuit
Views:
UK: 4
EN: 10
RU: 5
AI status
Completed
Completed
100%
Causes
- Broken or disconnected wiring in the passenger door harness (flex/door sill area)
- Corroded, bent or loose connector pins at the door switch, latch module or BCM
- Faulty door jamb/switch or latch position sensor in the passenger door
- Water intrusion or corrosion inside the door module or connector
- Faulty or misconfigured body control module or door control module
- Aftermarket equipment or recent repairs that disturbed door wiring
Symptoms
- Passenger door ajar warning lamp or message on dash
- Interior reading lamp stays on or does not respond to door
- Central locking may not lock/unlock passenger door or alarm may trigger
- Battery drain if lamp stays on
- DTC B1328 stored or repeated on scan tool
- Intermittent behaviour when closing/opening passenger door
What to check
- Scan vehicle, record freeze frame and pending codes; clear and recheck
- Visually inspect the passenger door wiring harness, especially at the hinge flex area
- Inspect door latch/switch connector for corrosion, bent pins or water
- Operate the door while monitoring the door-open input on a scan tool or multimeter
- Perform continuity and resistance checks between the door switch and BCM connector
- Wiggle-test wiring and connectors while observing signal to reproduce fault
Signal parameters
- Door-ajar sensor logic varies by vehicle: typically a switched circuit to ground when closed or a pulled-up input that reads ~0 V (closed) / ~12 V or open-circuit (open). Consult wiring diagram for exact levels.
- Closed switch: continuity (near 0 Ω) between switch terminal and ground or BCM input (depending on design).
- Open switch: high resistance / open circuit (OL) between switch terminal and ground.
- With module powered, expected digital input states can be read with a diagnostic tool (Open vs Closed).
- No CAN traffic expected for a pure open/closed door switch; some vehicles report state over CAN via door module.
Diagnostic algorithm
- Connect a capable scan tool, read/verifiy DTC B1328, note freeze frame and stored events. Clear code and see if it returns.
- Reproduce the symptom: open/close passenger door while watching the door-ajar status on the scan tool. Note if the input changes reliably.
- Visually inspect the passenger door area: check latch, switch, and door harness near the hinge for damage or pinched wires.
- With door closed, disconnect the passenger door latch/switch connector and check continuity between the switch terminals and BCM harness pins per wiring diagram. Expect continuity when switch is closed (may be to ground or specified reference).
- Backprobe the switch connector with the harness connected and measure voltage/state with door open and closed. Compare to manufacturer expected values. Do not short pins; use safe backprobing technique.
- Wiggle the hinge flex harness and connectors while monitoring the input/state to identify intermittent faults.
- If wiring and switch test good, inspect/replace the door latch/sensor assembly. After replacement, re-test and clear codes.
- If fault persists and wiring and latch are verified, inspect BCM/door module connector for corrosion or damaged pins and consider module-level diagnostics or replacement per manufacturer procedures.
- After repairs, verify function (lock/unlock, interior lamp, alarm) and perform final scan to ensure B1328 does not return.
Likely causes
- Damaged/abraded wiring in the door hinge flex harness (most common)
- Corroded/loose connector at the passenger door latch/switch
- Faulty door latch/sensor assembly
- Intermittent BCM input due to water or connector contamination
- Rare: defective BCM/door module
Fault status
Status
B1328 — Passenger door open circuit: Passenger door position signal is open or not detected by the body control module. May be stored as active, pending or historic depending on conditions.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1328
FIAT
B — Body
Passenger door open circuit
Views:
UK: 4
EN: 8
RU: 5
AI status
Completed
Completed
100%
Causes
- Broken or disconnected wiring in the passenger door harness (flex/door sill area)
- Corroded, bent or loose connector pins at the door switch, latch module or BCM
- Faulty door jamb/switch or latch position sensor in the passenger door
- Water intrusion or corrosion inside the door module or connector
- Faulty or misconfigured body control module or door control module
- Aftermarket equipment or recent repairs that disturbed door wiring
Symptoms
- Passenger door ajar warning lamp or message on dash
- Interior reading lamp stays on or does not respond to door
- Central locking may not lock/unlock passenger door or alarm may trigger
- Battery drain if lamp stays on
- DTC B1328 stored or repeated on scan tool
- Intermittent behaviour when closing/opening passenger door
What to check
- Scan vehicle, record freeze frame and pending codes; clear and recheck
- Visually inspect the passenger door wiring harness, especially at the hinge flex area
- Inspect door latch/switch connector for corrosion, bent pins or water
- Operate the door while monitoring the door-open input on a scan tool or multimeter
- Perform continuity and resistance checks between the door switch and BCM connector
- Wiggle-test wiring and connectors while observing signal to reproduce fault
Signal parameters
- Door-ajar sensor logic varies by vehicle: typically a switched circuit to ground when closed or a pulled-up input that reads ~0 V (closed) / ~12 V or open-circuit (open). Consult wiring diagram for exact levels.
- Closed switch: continuity (near 0 Ω) between switch terminal and ground or BCM input (depending on design).
- Open switch: high resistance / open circuit (OL) between switch terminal and ground.
- With module powered, expected digital input states can be read with a diagnostic tool (Open vs Closed).
- No CAN traffic expected for a pure open/closed door switch; some vehicles report state over CAN via door module.
Diagnostic algorithm
- Connect a capable scan tool, read/verifiy DTC B1328, note freeze frame and stored events. Clear code and see if it returns.
- Reproduce the symptom: open/close passenger door while watching the door-ajar status on the scan tool. Note if the input changes reliably.
- Visually inspect the passenger door area: check latch, switch, and door harness near the hinge for damage or pinched wires.
- With door closed, disconnect the passenger door latch/switch connector and check continuity between the switch terminals and BCM harness pins per wiring diagram. Expect continuity when switch is closed (may be to ground or specified reference).
- Backprobe the switch connector with the harness connected and measure voltage/state with door open and closed. Compare to manufacturer expected values. Do not short pins; use safe backprobing technique.
- Wiggle the hinge flex harness and connectors while monitoring the input/state to identify intermittent faults.
- If wiring and switch test good, inspect/replace the door latch/sensor assembly. After replacement, re-test and clear codes.
- If fault persists and wiring and latch are verified, inspect BCM/door module connector for corrosion or damaged pins and consider module-level diagnostics or replacement per manufacturer procedures.
- After repairs, verify function (lock/unlock, interior lamp, alarm) and perform final scan to ensure B1328 does not return.
Likely causes
- Damaged/abraded wiring in the door hinge flex harness (most common)
- Corroded/loose connector at the passenger door latch/switch
- Faulty door latch/sensor assembly
- Intermittent BCM input due to water or connector contamination
- Rare: defective BCM/door module
Fault status
Status
B1328 — Passenger door open circuit: Passenger door position signal is open or not detected by the body control module. May be stored as active, pending or historic depending on conditions.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Your experience will help others
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Was this AI description helpful?
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Code
B1328
HUMMER
B — Body
Vehicle system voltage is greater than 15.9 volts
Views:
UK: 5
EN: 13
RU: 8
AI status
Completed
Completed
100%
Causes
- Broken or disconnected wiring in the passenger door harness (flex/door sill area)
- Corroded, bent or loose connector pins at the door switch, latch module or BCM
- Faulty door jamb/switch or latch position sensor in the passenger door
- Water intrusion or corrosion inside the door module or connector
- Faulty or misconfigured body control module or door control module
- Aftermarket equipment or recent repairs that disturbed door wiring
Symptoms
- Passenger door ajar warning lamp or message on dash
- Interior reading lamp stays on or does not respond to door
- Central locking may not lock/unlock passenger door or alarm may trigger
- Battery drain if lamp stays on
- DTC B1328 stored or repeated on scan tool
- Intermittent behaviour when closing/opening passenger door
What to check
- Scan vehicle, record freeze frame and pending codes; clear and recheck
- Visually inspect the passenger door wiring harness, especially at the hinge flex area
- Inspect door latch/switch connector for corrosion, bent pins or water
- Operate the door while monitoring the door-open input on a scan tool or multimeter
- Perform continuity and resistance checks between the door switch and BCM connector
- Wiggle-test wiring and connectors while observing signal to reproduce fault
Signal parameters
- Door-ajar sensor logic varies by vehicle: typically a switched circuit to ground when closed or a pulled-up input that reads ~0 V (closed) / ~12 V or open-circuit (open). Consult wiring diagram for exact levels.
- Closed switch: continuity (near 0 Ω) between switch terminal and ground or BCM input (depending on design).
- Open switch: high resistance / open circuit (OL) between switch terminal and ground.
- With module powered, expected digital input states can be read with a diagnostic tool (Open vs Closed).
- No CAN traffic expected for a pure open/closed door switch; some vehicles report state over CAN via door module.
Diagnostic algorithm
- Connect a capable scan tool, read/verifiy DTC B1328, note freeze frame and stored events. Clear code and see if it returns.
- Reproduce the symptom: open/close passenger door while watching the door-ajar status on the scan tool. Note if the input changes reliably.
- Visually inspect the passenger door area: check latch, switch, and door harness near the hinge for damage or pinched wires.
- With door closed, disconnect the passenger door latch/switch connector and check continuity between the switch terminals and BCM harness pins per wiring diagram. Expect continuity when switch is closed (may be to ground or specified reference).
- Backprobe the switch connector with the harness connected and measure voltage/state with door open and closed. Compare to manufacturer expected values. Do not short pins; use safe backprobing technique.
- Wiggle the hinge flex harness and connectors while monitoring the input/state to identify intermittent faults.
- If wiring and switch test good, inspect/replace the door latch/sensor assembly. After replacement, re-test and clear codes.
- If fault persists and wiring and latch are verified, inspect BCM/door module connector for corrosion or damaged pins and consider module-level diagnostics or replacement per manufacturer procedures.
- After repairs, verify function (lock/unlock, interior lamp, alarm) and perform final scan to ensure B1328 does not return.
Likely causes
- Damaged/abraded wiring in the door hinge flex harness (most common)
- Corroded/loose connector at the passenger door latch/switch
- Faulty door latch/sensor assembly
- Intermittent BCM input due to water or connector contamination
- Rare: defective BCM/door module
Fault status
Status
B1328 — Passenger door open circuit: Passenger door position signal is open or not detected by the body control module. May be stored as active, pending or historic depending on conditions.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
B1328
Other
B — Body
Passenger Door Ajar Circuit Open
Views:
UK: 17
EN: 49
RU: 28
AI status
Completed
Completed
100%
Causes
- Broken or disconnected wiring in the passenger door harness (flex/door sill area)
- Corroded, bent or loose connector pins at the door switch, latch module or BCM
- Faulty door jamb/switch or latch position sensor in the passenger door
- Water intrusion or corrosion inside the door module or connector
- Faulty or misconfigured body control module or door control module
- Aftermarket equipment or recent repairs that disturbed door wiring
Symptoms
- Passenger door ajar warning lamp or message on dash
- Interior reading lamp stays on or does not respond to door
- Central locking may not lock/unlock passenger door or alarm may trigger
- Battery drain if lamp stays on
- DTC B1328 stored or repeated on scan tool
- Intermittent behaviour when closing/opening passenger door
What to check
- Scan vehicle, record freeze frame and pending codes; clear and recheck
- Visually inspect the passenger door wiring harness, especially at the hinge flex area
- Inspect door latch/switch connector for corrosion, bent pins or water
- Operate the door while monitoring the door-open input on a scan tool or multimeter
- Perform continuity and resistance checks between the door switch and BCM connector
- Wiggle-test wiring and connectors while observing signal to reproduce fault
Signal parameters
- Door-ajar sensor logic varies by vehicle: typically a switched circuit to ground when closed or a pulled-up input that reads ~0 V (closed) / ~12 V or open-circuit (open). Consult wiring diagram for exact levels.
- Closed switch: continuity (near 0 Ω) between switch terminal and ground or BCM input (depending on design).
- Open switch: high resistance / open circuit (OL) between switch terminal and ground.
- With module powered, expected digital input states can be read with a diagnostic tool (Open vs Closed).
- No CAN traffic expected for a pure open/closed door switch; some vehicles report state over CAN via door module.
Diagnostic algorithm
- Connect a capable scan tool, read/verifiy DTC B1328, note freeze frame and stored events. Clear code and see if it returns.
- Reproduce the symptom: open/close passenger door while watching the door-ajar status on the scan tool. Note if the input changes reliably.
- Visually inspect the passenger door area: check latch, switch, and door harness near the hinge for damage or pinched wires.
- With door closed, disconnect the passenger door latch/switch connector and check continuity between the switch terminals and BCM harness pins per wiring diagram. Expect continuity when switch is closed (may be to ground or specified reference).
- Backprobe the switch connector with the harness connected and measure voltage/state with door open and closed. Compare to manufacturer expected values. Do not short pins; use safe backprobing technique.
- Wiggle the hinge flex harness and connectors while monitoring the input/state to identify intermittent faults.
- If wiring and switch test good, inspect/replace the door latch/sensor assembly. After replacement, re-test and clear codes.
- If fault persists and wiring and latch are verified, inspect BCM/door module connector for corrosion or damaged pins and consider module-level diagnostics or replacement per manufacturer procedures.
- After repairs, verify function (lock/unlock, interior lamp, alarm) and perform final scan to ensure B1328 does not return.
Likely causes
- Damaged/abraded wiring in the door hinge flex harness (most common)
- Corroded/loose connector at the passenger door latch/switch
- Faulty door latch/sensor assembly
- Intermittent BCM input due to water or connector contamination
- Rare: defective BCM/door module
Fault status
Status
B1328 — Passenger door open circuit: Passenger door position signal is open or not detected by the body control module. May be stored as active, pending or historic depending on conditions.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email