Code
P1017
DACIA
P — Powertrain
Engine coolant blower motor relay, low speed - circuit malfunction
AI status
Completed
Completed
100%
Causes
- Blower motor low-speed relay faulty or sticking
- Open, short or high-resistance wiring in relay output or control circuit
- Blower motor resistor / low-speed element failed
- Poor ground or corroded connector at blower, relay, or control module
- Blower motor drawing excessive current (internal short) causing circuit fault
- Body/BCM/engine control module output driver fault (relay control)
Symptoms
- Blower fan does not run at low speed but may run at higher speeds
- No blower operation on selected low speed setting
- Intermittent low-speed operation or only works after tapping relay
- HVAC blower only works on high speed (direct feed) or not at all
- Blown fuse or repeated fuse failures in blower circuit
- Malfunction indicator or stored DTC P1017
What to check
- Verify customer complaint and reproduce symptom with HVAC controls
- Scan for P1017 and any related HVAC/body module codes; record freeze frame and live data
- Check blower fuses and relay appearance (burnt, melted, corrosion)
- Listen/feel for relay click when low-speed is requested; operate blower at all speed settings
- Inspect connectors and wiring at relay, blower motor, and resistor pack for corrosion, loose pins or heat damage
- Measure voltage at relay supply terminal (battery feed) and relay control terminal while commanding low speed
Signal parameters
- Relay supply (B+) with ignition ON: ~11–14 V (battery voltage)
- Relay control command (from BCM/ECU) when low speed requested: switches to ground or +12 V depending on design — should change from inactive to active state
- Blower low-speed output terminal while commanded: voltage typically reduced (0–12 V) depending on resistor/PWM; should change from inactive to active
- Blower motor current draw (when running): typical range 5–20 A depending on motor and speed; excessive current (>specified) indicates motor or short
- Relay coil resistance (typical): tens to a few hundred ohms (verify against relay spec sheet)
Diagnostic algorithm
- Verify the code and attempt to reproduce the symptom. Record which speeds work and which do not.
- Visually inspect fuses, blower relay, resistor pack and connectors for corrosion, heat damage or melted plastic.
- With ignition ON and HVAC set to low, use a scan tool to command the blower low speed and observe module outputs and live data.
- Back-probe the relay: check for battery voltage at the relay supply terminal and check the control terminal for the expected command signal when low speed is selected.
- Measure voltage at the blower motor low-speed terminal (or resistor pack low-speed input) while commanded. If no change in voltage, suspect relay/wiring or control output.
- Check ground continuity from blower motor/resistor ground to chassis. High resistance in ground may cause failure at low speed.
- If relay control and supply are correct but no output at blower, remove and bench-test the relay or substitute a known-good relay. Re-test system.
- If relay output is present but motor does not operate at low speed, test the blower motor and resistor pack: measure motor resistance, spin the motor with direct 12 V to confirm operation and measure current draw.
- Repair or replace any damaged wiring, connectors, resistor pack, relay or blower motor as indicated. After repair, clear codes and retest all blower speeds to confirm proper operation.
- If wiring, relay and motor/resistor check good but the control signal is incorrect, investigate the controlling module (BCM/ECU) for driver faults or software updates with manufacturer resources.
- Safety note: blower circuits can carry high currents; use proper fused test leads, insulated tools and disconnect battery before replacing high-current components.
Likely causes
- Failed low-speed relay (most common)
- Corroded connector or terminal at relay or blower motor/resistor
- Damaged wiring harness between relay and blower motor/resistor
- Failed blower motor resistor pack or PCB (open resistor for low-speed)
- Blower motor worn/shorted causing overcurrent and circuit fault
- Control module (BCM/engine ECU) driver transistor or software fault
Fault status
Status
Low-speed blower motor relay circuit malfunction detected. Low-speed blower may not operate correctly. Inspect relay, wiring, resistor pack and blower motor.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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