Code
B1435
ALFA ROMEO
B — Body
High/low wiper speed relay coil open circuit
Views:
UK: 5
EN: 7
RU: 4
AI status
Completed
Completed
100%
Causes
- Faulty/high-resistance or open wiper speed relay coil
- Broken, disconnected or corroded wiring between relay and control module/power source
- Poor or missing ground connection for relay coil circuit
- Blown fuse supplying relay coil (if fused separately)
- Faulty body control module (BCM) or relay drive output
- Intermittent connector contact due to corrosion, bent pins or water ingress
Symptoms
- One or both wiper speeds inoperative (high and/or low)
- Wipers work only in park or single speed, or do not respond to switch
- Intermittent wiper operation or only operate when actuator is tapped/shifted
- DTC stored; possible related instrument panel message
What to check
- Read and record all related DTCs and live data with a scan tool
- Visually inspect relay, relay socket and wiring for corrosion, damage or loose pins
- Check relevant fuses and fuse holder for continuity and signs of overheating
- With ignition ON, verify whether relay coil connector receives approximate battery voltage on the supply pin
- Measure coil continuity/resistance across relay coil contacts with relay removed
- Check ground continuity from relay ground pin to chassis ground
Signal parameters
- Typical relay coil resistance: ~50–200 ohms (manufacturer-specific)
- Coil supply voltage when energized: ≈11–14.5 V (battery voltage with ignition ON and wipers commanded)
- Coil current when energized: roughly 60–300 mA depending on coil impedance
Diagnostic algorithm
- Retrieve freeze frame and all related codes with a scan tool; clear codes and attempt to re-run to confirm fault is repeatable.
- Perform visual inspection: relay, socket, wiring harness, and connectors for damage, corrosion or water ingress. Repair obvious issues.
- Check fuses: verify continuity of any fuses supplying the wiper relay coil; inspect fuse holder and replace if corroded.
- With ignition OFF remove relay. Measure coil resistance across the relay’s coil terminals using a multimeter. If infinite/open, replace the relay.
- With relay removed and ignition ON, backprobe the fuse/coil feed terminal at the relay socket to verify battery voltage when the wiper is commanded on. If no voltage, trace and repair feed circuit.
- With relay removed and wiper command active, measure resistance/continuity from relay coil return terminal to chassis ground. Repair poor ground as required.
- If coil shows continuity and correct voltages are present at the socket but relay does not operate or BCM does not command output, test BCM relay drive output with an oscilloscope or scope-capable scanner and consult wiring diagram. Consider BCM fault if drive absent despite correct inputs.
- After repairs, clear codes and verify proper operation of both wiper speeds and that B1435 does not reappear.
- Safety note: isolate battery when performing harness repairs and avoid shorting terminals; follow vehicle-specific service manual for airbag/radio code precautions if disconnecting battery.
Likely causes
- Failed wiper speed relay (most common)
- Open wiring or damaged insulation in relay coil feed or return circuit
- Corroded relay socket/connector preventing coil continuity
- Blown fuse in relay coil feed or damaged fuse holder
Fault status
Status
High/low wiper speed relay coil open circuit — relay coil does not show expected continuity or activation current; wiper speed control may be lost.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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