B1435

Code

Other B — Body

Wiper Hi/Low Speed Relay Coil Circuit Open

Brand: Other

Type: B — Body

Views: UK: 27 EN: 39 RU: 31

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Visually inspect relay, relay socket and harness for corrosion, heat damage, or disconnected pins
Check related fuses and power feed to the relay circuit
Backprobe relay socket while operating wiper switch to confirm coil supply voltage and ground when commanded
Measure coil resistance of the relay (relay removed) to check for open coil
Perform continuity check between relay socket and controlling module ground/power pins
Swap relay with identical known-good relay (if available) to see if behavior changes

Typical relay coil operating voltage: ~11–14 V when commanded (battery voltage present at coil feed)
Typical coil resistance (de-energized): roughly 20–200 Ω (varies by relay) — an open coil will show infinite resistance
Expected coil current when energized: tens to a few hundred milliamps depending on relay size
No PWM expected on a simple coil circuit unless manufacturer uses transistor/PWM driver — consult vehicle wiring diagram

Retrieve freeze-frame/live data and confirm DTC B1435 is current (not historic).
Visually inspect wiper relay, relay socket, connectors and harness for corrosion, damage or water intrusion. Repair as needed.
Check related fuses and battery feed to the relay. Replace any blown fuses and re-test.
With ignition on, backprobe the relay coil pins at the socket while operating the wiper switch: verify battery voltage on the feed side and verify the control/ground side is switching (to ground or switched supply) when the switch requests high/low. Record results.
Remove relay and measure coil resistance with an ohmmeter. Infinite resistance indicates an open coil — replace relay.
If coil resistance is good but no activation at socket, perform continuity checks between relay socket and module/ground; repair broken wires or poor grounds. Perform wiggle tests while observing voltages.
Swap with a known-good identical relay to confirm function if available. If relay swap cures the issue, replace failed relay.
If coil and wiring are good but module output does not switch, test or inspect the BCM/relay driver circuit per manufacturer procedures — consider module diagnosis or replacement only after wiring/relay are proven good.
After repairs, clear the code and re-check operation and that the code does not return.