Code
B1288
ALFA ROMEO
B — Body
Right air intake potentiometer servo circuit
Views:
UK: 3
EN: 7
RU: 2
AI status
Completed
Completed
100%
Causes
- Open circuit in potentiometer signal wire
- Short to ground or battery on potentiometer signal or reference wire
- Corroded/damaged connector at right air intake servo
- Internal failure of the right intake potentiometer (wiper or element)
- Mechanical binding or seized actuator preventing correct feedback
- Poor ground or reference voltage from HVAC control module
Symptoms
- HVAC intake door stuck in one position (recirculation or fresh air)
- Erratic or intermittent change in air intake position
- HVAC displays fault message or stores DTC B1288
- Reduced HVAC control functionality or limp mode for vent selection
- Noise or unusual resistance when actuator is commanded
What to check
- Read and record stored DTCs and freeze frame data with a diagnostic scanner
- Visual inspection of right intake actuator, wiring harness and connectors for corrosion, damage or water ingress
- Check fuses and relays related to HVAC control
- Back-probe connector and monitor potentiometer signal while operating intake actuator with a scan tool
- Wiggle harness while monitoring signal to reproduce fault
- Perform actuator / end-stop tests from the diagnostic tool if available
Signal parameters
- Potentiometer reference voltage: ~5.0 V (typically 4.8–5.2 V)
- Potentiometer wiper output: typically ~0.5–4.5 V depending on position (should change smoothly as actuator moves)
- Potentiometer end-to-end resistance: commonly 5–20 kΩ (manufacturer-specific)
- Ground continuity: near 0 Ω between potentiometer ground and vehicle chassis ground
- Actuator motor current: low steady current when moving; large or stalled current indicates binding (typical
- Diagnostic position values: ECU should report a changing position value (e.g., 0–255 or 0–100%) when commanded
Diagnostic algorithm
- Connect an appropriate scan tool, read B1288 and any related HVAC codes; record freeze frame and live data
- Visually inspect the right intake actuator, mounting, and harness for damage, moisture or contamination; repair as needed
- With ignition ON, back-probe the actuator connector: verify 5 V reference and chassis ground presence
- Command the intake actuator through the scan tool while observing the potentiometer wiper voltage or position value; confirm the signal changes smoothly through full travel
- If wiper voltage is stuck or out-of-range, disconnect actuator and measure potentiometer end-to-end resistance and wiper-to-end resistances while moving actuator by hand; check for intermittent readings or open circuit
- Check connector pins and continuity from actuator connector to HVAC control module for opens/shorts; repair any wiring faults
- If wiring and voltages are correct but the potentiometer signal is still incorrect, replace the right air intake servo/actuator assembly
- After repair, clear DTCs and verify proper operation through full actuator sweep and confirm code does not return
Likely causes
- Damaged connector or pins at the right air intake servo
- Worn or contaminated potentiometer inside the actuator
- Broken or shorted harness between servo and HVAC module
- Actuator motor binding causing incorrect feedback
- Loss of 5 V reference or ground to the potentiometer
Fault status
Status
HVAC control module detected implausible/open/shorted signal from right air intake potentiometer; fault stored. May force limited HVAC vent/recirculation operation until corrected.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
B1288
FIAT
B — Body
Right air intake potentiometer servo circuit
Views:
UK: 3
EN: 6
RU: 2
AI status
Completed
Completed
100%
Causes
- Open circuit in potentiometer signal wire
- Short to ground or battery on potentiometer signal or reference wire
- Corroded/damaged connector at right air intake servo
- Internal failure of the right intake potentiometer (wiper or element)
- Mechanical binding or seized actuator preventing correct feedback
- Poor ground or reference voltage from HVAC control module
Symptoms
- HVAC intake door stuck in one position (recirculation or fresh air)
- Erratic or intermittent change in air intake position
- HVAC displays fault message or stores DTC B1288
- Reduced HVAC control functionality or limp mode for vent selection
- Noise or unusual resistance when actuator is commanded
What to check
- Read and record stored DTCs and freeze frame data with a diagnostic scanner
- Visual inspection of right intake actuator, wiring harness and connectors for corrosion, damage or water ingress
- Check fuses and relays related to HVAC control
- Back-probe connector and monitor potentiometer signal while operating intake actuator with a scan tool
- Wiggle harness while monitoring signal to reproduce fault
- Perform actuator / end-stop tests from the diagnostic tool if available
Signal parameters
- Potentiometer reference voltage: ~5.0 V (typically 4.8–5.2 V)
- Potentiometer wiper output: typically ~0.5–4.5 V depending on position (should change smoothly as actuator moves)
- Potentiometer end-to-end resistance: commonly 5–20 kΩ (manufacturer-specific)
- Ground continuity: near 0 Ω between potentiometer ground and vehicle chassis ground
- Actuator motor current: low steady current when moving; large or stalled current indicates binding (typical
- Diagnostic position values: ECU should report a changing position value (e.g., 0–255 or 0–100%) when commanded
Diagnostic algorithm
- Connect an appropriate scan tool, read B1288 and any related HVAC codes; record freeze frame and live data
- Visually inspect the right intake actuator, mounting, and harness for damage, moisture or contamination; repair as needed
- With ignition ON, back-probe the actuator connector: verify 5 V reference and chassis ground presence
- Command the intake actuator through the scan tool while observing the potentiometer wiper voltage or position value; confirm the signal changes smoothly through full travel
- If wiper voltage is stuck or out-of-range, disconnect actuator and measure potentiometer end-to-end resistance and wiper-to-end resistances while moving actuator by hand; check for intermittent readings or open circuit
- Check connector pins and continuity from actuator connector to HVAC control module for opens/shorts; repair any wiring faults
- If wiring and voltages are correct but the potentiometer signal is still incorrect, replace the right air intake servo/actuator assembly
- After repair, clear DTCs and verify proper operation through full actuator sweep and confirm code does not return
Likely causes
- Damaged connector or pins at the right air intake servo
- Worn or contaminated potentiometer inside the actuator
- Broken or shorted harness between servo and HVAC module
- Actuator motor binding causing incorrect feedback
- Loss of 5 V reference or ground to the potentiometer
Fault status
Status
HVAC control module detected implausible/open/shorted signal from right air intake potentiometer; fault stored. May force limited HVAC vent/recirculation operation until corrected.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
B1288
LAND ROVER
B — Body
Right air intake servo motor potentiometer - circuit failure
Views:
UK: 5
EN: 7
RU: 4
AI status
Completed
Completed
100%
Causes
- Open circuit in potentiometer signal wire
- Short to ground or battery on potentiometer signal or reference wire
- Corroded/damaged connector at right air intake servo
- Internal failure of the right intake potentiometer (wiper or element)
- Mechanical binding or seized actuator preventing correct feedback
- Poor ground or reference voltage from HVAC control module
Symptoms
- HVAC intake door stuck in one position (recirculation or fresh air)
- Erratic or intermittent change in air intake position
- HVAC displays fault message or stores DTC B1288
- Reduced HVAC control functionality or limp mode for vent selection
- Noise or unusual resistance when actuator is commanded
What to check
- Read and record stored DTCs and freeze frame data with a diagnostic scanner
- Visual inspection of right intake actuator, wiring harness and connectors for corrosion, damage or water ingress
- Check fuses and relays related to HVAC control
- Back-probe connector and monitor potentiometer signal while operating intake actuator with a scan tool
- Wiggle harness while monitoring signal to reproduce fault
- Perform actuator / end-stop tests from the diagnostic tool if available
Signal parameters
- Potentiometer reference voltage: ~5.0 V (typically 4.8–5.2 V)
- Potentiometer wiper output: typically ~0.5–4.5 V depending on position (should change smoothly as actuator moves)
- Potentiometer end-to-end resistance: commonly 5–20 kΩ (manufacturer-specific)
- Ground continuity: near 0 Ω between potentiometer ground and vehicle chassis ground
- Actuator motor current: low steady current when moving; large or stalled current indicates binding (typical
- Diagnostic position values: ECU should report a changing position value (e.g., 0–255 or 0–100%) when commanded
Diagnostic algorithm
- Connect an appropriate scan tool, read B1288 and any related HVAC codes; record freeze frame and live data
- Visually inspect the right intake actuator, mounting, and harness for damage, moisture or contamination; repair as needed
- With ignition ON, back-probe the actuator connector: verify 5 V reference and chassis ground presence
- Command the intake actuator through the scan tool while observing the potentiometer wiper voltage or position value; confirm the signal changes smoothly through full travel
- If wiper voltage is stuck or out-of-range, disconnect actuator and measure potentiometer end-to-end resistance and wiper-to-end resistances while moving actuator by hand; check for intermittent readings or open circuit
- Check connector pins and continuity from actuator connector to HVAC control module for opens/shorts; repair any wiring faults
- If wiring and voltages are correct but the potentiometer signal is still incorrect, replace the right air intake servo/actuator assembly
- After repair, clear DTCs and verify proper operation through full actuator sweep and confirm code does not return
Likely causes
- Damaged connector or pins at the right air intake servo
- Worn or contaminated potentiometer inside the actuator
- Broken or shorted harness between servo and HVAC module
- Actuator motor binding causing incorrect feedback
- Loss of 5 V reference or ground to the potentiometer
Fault status
Status
HVAC control module detected implausible/open/shorted signal from right air intake potentiometer; fault stored. May force limited HVAC vent/recirculation operation until corrected.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
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Code
B1288
Other
B — Body
Servo Motor Potentiometer Airintake Right Circuit Failure
Views:
UK: 14
EN: 17
RU: 10
AI status
Completed
Completed
100%
Causes
- Open circuit in potentiometer signal wire
- Short to ground or battery on potentiometer signal or reference wire
- Corroded/damaged connector at right air intake servo
- Internal failure of the right intake potentiometer (wiper or element)
- Mechanical binding or seized actuator preventing correct feedback
- Poor ground or reference voltage from HVAC control module
Symptoms
- HVAC intake door stuck in one position (recirculation or fresh air)
- Erratic or intermittent change in air intake position
- HVAC displays fault message or stores DTC B1288
- Reduced HVAC control functionality or limp mode for vent selection
- Noise or unusual resistance when actuator is commanded
What to check
- Read and record stored DTCs and freeze frame data with a diagnostic scanner
- Visual inspection of right intake actuator, wiring harness and connectors for corrosion, damage or water ingress
- Check fuses and relays related to HVAC control
- Back-probe connector and monitor potentiometer signal while operating intake actuator with a scan tool
- Wiggle harness while monitoring signal to reproduce fault
- Perform actuator / end-stop tests from the diagnostic tool if available
Signal parameters
- Potentiometer reference voltage: ~5.0 V (typically 4.8–5.2 V)
- Potentiometer wiper output: typically ~0.5–4.5 V depending on position (should change smoothly as actuator moves)
- Potentiometer end-to-end resistance: commonly 5–20 kΩ (manufacturer-specific)
- Ground continuity: near 0 Ω between potentiometer ground and vehicle chassis ground
- Actuator motor current: low steady current when moving; large or stalled current indicates binding (typical
- Diagnostic position values: ECU should report a changing position value (e.g., 0–255 or 0–100%) when commanded
Diagnostic algorithm
- Connect an appropriate scan tool, read B1288 and any related HVAC codes; record freeze frame and live data
- Visually inspect the right intake actuator, mounting, and harness for damage, moisture or contamination; repair as needed
- With ignition ON, back-probe the actuator connector: verify 5 V reference and chassis ground presence
- Command the intake actuator through the scan tool while observing the potentiometer wiper voltage or position value; confirm the signal changes smoothly through full travel
- If wiper voltage is stuck or out-of-range, disconnect actuator and measure potentiometer end-to-end resistance and wiper-to-end resistances while moving actuator by hand; check for intermittent readings or open circuit
- Check connector pins and continuity from actuator connector to HVAC control module for opens/shorts; repair any wiring faults
- If wiring and voltages are correct but the potentiometer signal is still incorrect, replace the right air intake servo/actuator assembly
- After repair, clear DTCs and verify proper operation through full actuator sweep and confirm code does not return
Likely causes
- Damaged connector or pins at the right air intake servo
- Worn or contaminated potentiometer inside the actuator
- Broken or shorted harness between servo and HVAC module
- Actuator motor binding causing incorrect feedback
- Loss of 5 V reference or ground to the potentiometer
Fault status
Status
HVAC control module detected implausible/open/shorted signal from right air intake potentiometer; fault stored. May force limited HVAC vent/recirculation operation until corrected.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Workshop Manuals
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Workshop ManualLAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
+100 karma for a short comment :)
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