B1473 — Wiper Low Speed Circuit Motor Failure

The diagnostic trouble code (DTC) B1473 indicates a problem within the low-speed circuit of the vehicle’s windshield wiper motor. Specifically, it points to a failure or malfunction in the electrical circuit that controls the wiper motor’s low-speed operation. This code is set when the vehicle’s engine control unit (ECU) detects an abnormality or inconsistency in the low-speed circuit’s electrical signals.

Note: Manufacturers may label or code this fault differently depending on the specific OEM (Original Equipment Manufacturer). Always consult the vehicle-specific repair information for precise details.

Fast Facts

System affected: Windshield wiper motor control circuit
Severity: Moderate — may impair visibility in inclement weather
Main symptoms: Wipers fail to operate on low speed setting, intermittent operation, or stuck in a certain position
Driveability: Limited — wipers may not function as intended, but vehicle can typically still be driven safely

Manufacturer variations for trouble code B1473

The coding for wiper motor circuit faults can vary among vehicle manufacturers; some OEMs may assign different codes or labels to similar issues involving the low-speed wiper circuit. It’s important to recognize that labels might differ, but the underlying issue remains comparable.

Honda: Sometimes referenced as HDS code 3-124 or similar systems specific codes
Ford: Might refer to it as Fault Code B1473 within the body control module diagnostics
Volkswagen / Audi / SEAT / Skoda: Often identified with a similar code but with different labelling in their diagnostic systems
Peugeot / Citroën: May present as Diagnostic Troubles Code B1473 in their engine or body module to indicate wiper circuit issues

What does trouble code B1473 mean?

B1473 is a diagnostic code that signals an issue specifically with the wiper motor’s low-speed circuit. The Electronic Control Unit (ECU)—the vehicle’s « brain » that manages various electrical components—monitors the electrical signals and operation of the wiper system. When it detects irregularities, such as incorrect voltages, faulty wiring, or malfunctioning components in the low-speed circuit, it triggers this code.

This code usually appears when the wipers fail to operate properly on the low-speed setting or do not respond at all. It may also show up if the circuit experiences short circuits, open circuits, or resistance issues that prevent proper communication or power delivery to the low-speed motor. Often, this fault develops after wiring work, water ingress, or component aging.

Severity and risks of trouble code B1473

The risks associated with B1473 generally revolve around reduced visibility during adverse weather conditions. Although it doesn’t hinder the vehicle’s fundamental operation, not being able to use the wipers at low speed can be hazardous in rain, snow, or icy conditions. The failure can lead to increased driver frustration and increased risk of accidents if visibility becomes poor.

Is this a critical safety issue? Limited. The vehicle can typically still be driven, but repair as soon as possible is advised to restore full functionality and safety.

Symptoms of trouble code B1473

When this code is active, several tell-tale symptoms may reveal themselves to the driver or technician:

Wipers not operating on low speed: The wipers may work only on high speed or not at all.
Intermittent wiper operation: Wipers might operate erratically, only sporadically responding to commands.
Unresponsive wipers in certain settings: No movement when selecting low speed, with other speeds functioning normally.
Wipers stuck in a fixed position: Sometimes the wipers stay in a parked position and fail to move when activated.
Shared electrical issues: Sometimes, related electrical components such as wiper relay or switch faults may be evident.

Most likely causes of trouble code B1473

Diagnosing B1473 involves understanding the primary culprits behind the fault. Below are the most common causes ranked from the most frequent to less typical ones:

Wiper motor circuit wiring fault: Damaged, corroded, or frayed wiring harnesses leading to poor electrical contact or open circuits.
Faulty wiper motor with low-speed control issues: An internal electronic fault within the motor itself, especially affecting the low-speed operation.
Blown fuse or relay: An electrical protective device that controls power to the wiper motor circuit may have failed.
Wiring connector corrosion or poor connection: Corrosion or loose fittings at connector points disrupting signal flow.
Body control module (BCM) or ECU malfunction: Rare but possible, especially if other electrical functions are also impacted.

How to diagnose trouble code B1473

Proper diagnosis involves systematic checks, starting with basic visual inspections. Here are generic, safe steps to identify the root cause:

Visual inspection of wiring and connectors: Check for damage, corrosion, or loose connections around the wiper motor wiring harness and connector plugs.
Inspect the fuse and relay: Verify the condition of the fuse controlling the wiper circuit and test or replace the relay if applicable.
Test the wiper motor directly: Remove the motor and test it outside the vehicle with an appropriate power source. Observe if it runs on low and high settings.
Check live data from the vehicle’s scan tool: View the wiper circuit status and sensor signals to identify irregularities or abnormal voltages.
Perform continuity tests: Use a multimeter to verify the wiring from the switch, relay, and motor for open circuits or shorts.

Possible repairs for trouble code B1473

Depending on the identified cause, the repairs may range from simple to complex. Here are potential solutions:

Replace or repair damaged wiring or connectors: This is a common repair if external wiring issues are discovered. Basic repair requiring minimal expertise.
Change the wiper motor: If the motor is internally faulty, especially affecting low-speed operation, replacement is necessary. Usually performed by a professional.
Replace blown fuses or relays: A straightforward fix that restores electrical supply if failed.
Clean or re-seat electrical connectors: Removing corrosion or reattaching loose connections can often resolve intermittent issues. Suitable for DIY or professional repair.
Reprogram or replace the BCM/ECU: If the vehicle’s main computer module is implicated, software updates or replacements might be required, best handled by a professional with manufacturer-specific tools.

Vehicles commonly associated with trouble code B1473 in Europe

This fault can appear across numerous vehicle brands. However, some models and engine families tend to report this code more frequently based on available diagnostic data. Broadly, it appears in:

Volkswagen Group: Audi, VW, Škoda, SEAT (various models with electric wiper systems)
Ford: Certain models equipped with electric wiper modules
Honda: Some older models where electrical wiper control is integrated
Peugeot / Citroën: Vehicles with electric wiper controls integrated into the body control system

Frequent mistakes with trouble code B1473

Throughout diagnosis and repair, technicians often run into common pitfalls that can complicate resolution. Here are these pitfalls and how to avoid them:

Ignoring wiring inspections: Jumping straight to replacing the motor without examining wiring or connections often leads to unnecessary costs.
Misinterpreting similar codes: Assuming a multifaceted code where only the low-speed circuit is at fault may lead to unnecessary parts replacement.
Overlooking external factors: Water ingress or corrosion can cause faults that appear electrical but stem from environmental damage.
Using incorrect test procedures: Relying solely on visual inspections without live data or proper testing can mislead diagnosis.

FAQ — trouble code B1473

Can this code disappear on its own? Usually not. Electrical faults such as wiring damage or component failure tend to persist until repaired.

Can I keep driving? In most cases, yes—but with caution. The wipers may not function properly, especially on low speed. It’s advisable to have the vehicle serviced soon to prevent worsening of the issue.

Why does the code return after clearing? If the root cause isn’t fixed, the fault will reappear once the system runs diagnostics again. Persistent issues often involve wiring or component failures that need proper repair.