Code
B1264
ALFA ROMEO
B — Body
Floor ventilation flap control circuit
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to the floor ventilation flap actuator
- Bad connector or corroded terminal at actuator or control module
- Failed floor flap actuator motor or internal gearbox
- Failed flap position sensor (potentiometer) inside actuator
- Mechanical binding, broken linkage or obstruction of the flap
- Blown fuse or poor ground at HVAC/BCM module
Symptoms
- Floor vent cannot be selected or remains stuck in one position
- Airflow does not change to floor outlets when commanded
- Clicking or grinding noise from dash when mode is changed
- HVAC control displays a ventilation fault or limited mode operation
- Uneven airflow distribution despite blower operation
What to check
- Read and record all HVAC/air distribution DTCs with a compatible scan tool
- Verify fuse(s) for HVAC/ventilation actuators and control modules
- Visually inspect actuator, connector and wiring for damage, corrosion or pinback
- Attempt to operate mode selection while listening/watching the floor flap actuator
- Backprobe actuator connector and check for power, ground and position signal with command active
- Check continuity and resistance of motor and position sensor circuit with connector disconnected
Signal parameters
- Reference/supply voltage to actuator: approximately battery voltage when commanded (~11–14 V)
- Position sensor reference: typically 5 V reference from control module
- Position sensor feedback: varies with flap position (roughly 0.5–4.5 V) — should change when flap is commanded
- Motor current: actuator motors commonly draw up to ~0.5–2 A during movement; near-zero when stalled or open circuit
- Expected resistance: motor windings typically low ohms when measured between motor power pins (varies by actuator)
Diagnostic algorithm
- Connect a diagnostic scan tool and note B1264 plus any related HVAC codes; record live data for flap position feedback
- Verify fuses and check for good ground at the HVAC/actuator module
- With ignition on, command the ventilation mode to floor and watch/listen for actuator movement
- Backprobe the actuator connector: verify supply voltage, ground and position feedback while commanding flap movement
- If supply and ground are present but position feedback doesn’t change, remove actuator and check for mechanical binding or broken gears
- Measure motor windings and position sensor resistance with connector disconnected; compare to service specifications if available
- If wiring or connector suspect, perform continuity checks back to the HVAC control module and repair any opens/shorts
- If actuator is nonfunctional or position sensor out of range, replace the floor flap actuator assembly
- After repair, clear codes, verify correct movement across full range and confirm code does not return
Likely causes
- Failed flap actuator or internal position sensor
- Damaged connector or wiring harness (open/short/intermittent)
- Mechanical blockage of flap movement
Fault status
Status
HVAC floor ventilation flap control circuit malfunction detected — check actuator, wiring and HVAC control module
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
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Code
B1264
FIAT
B — Body
Floor ventilation flap control circuit
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to the floor ventilation flap actuator
- Bad connector or corroded terminal at actuator or control module
- Failed floor flap actuator motor or internal gearbox
- Failed flap position sensor (potentiometer) inside actuator
- Mechanical binding, broken linkage or obstruction of the flap
- Blown fuse or poor ground at HVAC/BCM module
Symptoms
- Floor vent cannot be selected or remains stuck in one position
- Airflow does not change to floor outlets when commanded
- Clicking or grinding noise from dash when mode is changed
- HVAC control displays a ventilation fault or limited mode operation
- Uneven airflow distribution despite blower operation
What to check
- Read and record all HVAC/air distribution DTCs with a compatible scan tool
- Verify fuse(s) for HVAC/ventilation actuators and control modules
- Visually inspect actuator, connector and wiring for damage, corrosion or pinback
- Attempt to operate mode selection while listening/watching the floor flap actuator
- Backprobe actuator connector and check for power, ground and position signal with command active
- Check continuity and resistance of motor and position sensor circuit with connector disconnected
Signal parameters
- Reference/supply voltage to actuator: approximately battery voltage when commanded (~11–14 V)
- Position sensor reference: typically 5 V reference from control module
- Position sensor feedback: varies with flap position (roughly 0.5–4.5 V) — should change when flap is commanded
- Motor current: actuator motors commonly draw up to ~0.5–2 A during movement; near-zero when stalled or open circuit
- Expected resistance: motor windings typically low ohms when measured between motor power pins (varies by actuator)
Diagnostic algorithm
- Connect a diagnostic scan tool and note B1264 plus any related HVAC codes; record live data for flap position feedback
- Verify fuses and check for good ground at the HVAC/actuator module
- With ignition on, command the ventilation mode to floor and watch/listen for actuator movement
- Backprobe the actuator connector: verify supply voltage, ground and position feedback while commanding flap movement
- If supply and ground are present but position feedback doesn’t change, remove actuator and check for mechanical binding or broken gears
- Measure motor windings and position sensor resistance with connector disconnected; compare to service specifications if available
- If wiring or connector suspect, perform continuity checks back to the HVAC control module and repair any opens/shorts
- If actuator is nonfunctional or position sensor out of range, replace the floor flap actuator assembly
- After repair, clear codes, verify correct movement across full range and confirm code does not return
Likely causes
- Failed flap actuator or internal position sensor
- Damaged connector or wiring harness (open/short/intermittent)
- Mechanical blockage of flap movement
Fault status
Status
HVAC floor ventilation flap control circuit malfunction detected — check actuator, wiring and HVAC control module
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1264
Other
B — Body
Servo Motor Foot Circuit Failure
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to the floor ventilation flap actuator
- Bad connector or corroded terminal at actuator or control module
- Failed floor flap actuator motor or internal gearbox
- Failed flap position sensor (potentiometer) inside actuator
- Mechanical binding, broken linkage or obstruction of the flap
- Blown fuse or poor ground at HVAC/BCM module
Symptoms
- Floor vent cannot be selected or remains stuck in one position
- Airflow does not change to floor outlets when commanded
- Clicking or grinding noise from dash when mode is changed
- HVAC control displays a ventilation fault or limited mode operation
- Uneven airflow distribution despite blower operation
What to check
- Read and record all HVAC/air distribution DTCs with a compatible scan tool
- Verify fuse(s) for HVAC/ventilation actuators and control modules
- Visually inspect actuator, connector and wiring for damage, corrosion or pinback
- Attempt to operate mode selection while listening/watching the floor flap actuator
- Backprobe actuator connector and check for power, ground and position signal with command active
- Check continuity and resistance of motor and position sensor circuit with connector disconnected
Signal parameters
- Reference/supply voltage to actuator: approximately battery voltage when commanded (~11–14 V)
- Position sensor reference: typically 5 V reference from control module
- Position sensor feedback: varies with flap position (roughly 0.5–4.5 V) — should change when flap is commanded
- Motor current: actuator motors commonly draw up to ~0.5–2 A during movement; near-zero when stalled or open circuit
- Expected resistance: motor windings typically low ohms when measured between motor power pins (varies by actuator)
Diagnostic algorithm
- Connect a diagnostic scan tool and note B1264 plus any related HVAC codes; record live data for flap position feedback
- Verify fuses and check for good ground at the HVAC/actuator module
- With ignition on, command the ventilation mode to floor and watch/listen for actuator movement
- Backprobe the actuator connector: verify supply voltage, ground and position feedback while commanding flap movement
- If supply and ground are present but position feedback doesn’t change, remove actuator and check for mechanical binding or broken gears
- Measure motor windings and position sensor resistance with connector disconnected; compare to service specifications if available
- If wiring or connector suspect, perform continuity checks back to the HVAC control module and repair any opens/shorts
- If actuator is nonfunctional or position sensor out of range, replace the floor flap actuator assembly
- After repair, clear codes, verify correct movement across full range and confirm code does not return
Likely causes
- Failed flap actuator or internal position sensor
- Damaged connector or wiring harness (open/short/intermittent)
- Mechanical blockage of flap movement
Fault status
Status
HVAC floor ventilation flap control circuit malfunction detected — check actuator, wiring and HVAC control module
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
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