B1289

Code

Other B — Body

Servo Motor Potentiometer Airintake Right Circuit Open

Brand: Other

Type: B — Body

Views: UK: 26 EN: 48 RU: 20

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Open or broken wiring between the servo motor potentiometer and the control module
Corroded or loose connector at the servo motor
Faulty servo motor with internal potentiometer failure
Poor ground or missing reference voltage to the potentiometer
Intermittent connector contact from water ingress or vibration
Control module fault (rare)

Reference (supply) voltage to potentiometer: typically ~5 V (varies by vehicle)
Potentiometer output voltage: changes with door position, commonly ~0.5–4.5 V across range
Ground: low resistance to chassis ground (
No output (open circuit) or fixed voltage indicates open/failed potentiometer
Resistance across potentiometer terminals should vary smoothly with actuator movement

Retrieve all HVAC and body DTCs and note freeze frame/ignition state.
Attempt to operate the HVAC intake/recirc functions while observing actuator: note noise, movement, and if the code is active.
Visually inspect the right air intake actuator and harness for damage, corrosion, or loose pins. Repair or clean as needed.
With ignition ON (engine off unless manufacturer specifies otherwise), backprobe the actuator connector: verify reference voltage, ground, and potentiometer signal. Compare to expected signal parameters.
If reference voltage or ground is missing, trace wiring back to the control module and repair short/open. Check connector at module.
If reference and ground are present but potentiometer output is open or does not change with movement, check continuity between actuator potentiometer terminals and control module. If open, repair wiring or connector.
If wiring and connectors are good but signal does not change, remove and bench-test or replace the actuator (potentiometer likely failed).
After repair or replacement, clear codes and perform actuator/recirculation function tests. Re-scan for codes and verify proper operation under normal conditions.
If fault persists after actuator replacement and wiring verified, consider control module input circuit testing or replacement per vehicle-specific procedures.