What Does B1473 Mean?
This code indicates the Body Control Module (BCM) has detected a fault in the low-speed circuit of the windshield wiper motor. The BCM monitors voltage and current in the wiper motor circuit and has determined that the motor is not responding properly when commanded to operate at low speed. This suggests either an electrical fault in the circuit between the BCM and motor, or a mechanical/electrical failure within the wiper motor itself.
Common Causes
45%
Failed wiper motor or worn motor brushes causing high resistance or open circuit in low-speed winding
25%
Corroded or loose wiring connections at wiper motor connector or BCM connector
20%
Damaged or shorted wiring in the low-speed circuit between BCM and wiper motor
10%
Failed Body Control Module with internal relay or driver circuit failure
Diagnostic Steps
1
Step 1: Perform visual inspection of wiper motor and all visible wiring harness for physical damage, corrosion, or loose connections. Check wiper motor ground connection for corrosion and ensure tight connection.
2
Step 2: Using a digital multimeter, test battery voltage at the wiper motor connector with key on. Verify power supply is present (should read 12-14V). Then test ground circuit for less than 0.5 ohms resistance to chassis ground.
3
Step 3: Disconnect wiper motor connector and perform resistance test on the low-speed winding of the wiper motor. Typical reading should be 2-8 ohms depending on manufacturer. Infinite resistance indicates open motor winding.
4
Step 4: If motor resistance is normal, back-probe the BCM connector at the wiper control circuit while commanding low-speed operation through scan tool actuation test. Verify BCM is sending proper voltage signal (typically 12V pulsed or switched ground depending on system design).
5
Step 5: If BCM output is correct but motor does not operate, replace wiper motor. If BCM shows no output signal, check BCM fuse and power/ground supplies. If all BCM supplies are correct, BCM replacement is required.
6
Step 6: After repair, clear codes and verify wiper operation at all speeds. Perform functional test in both intermittent and continuous modes to ensure complete system operation.
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a fault in the low-speed circuit of the windshield wiper motor. The BCM monitors voltage and current in the wiper motor circuit and has determined that the motor is not responding properly when commanded to operate at low speed. This sug...
The most common cause of B1473 (Wiper Low Speed Circuit Motor Failure) is: Failed wiper motor or worn motor brushes causing high resistance or open circuit in low-speed winding
Typical repair costs for B1473 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle can be driven safely in clear weather conditions, but reduced visibility during rain or snow creates significant safety hazard. Repair should be completed before operating vehicle in inclement weather to maintain adequate visibility and comply with safety regulations.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1473 to identify the root cause.
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Quick Info
Category
Body
System
Windshield Wiper System
Difficulty
Type
Manufacturer
Recommended Tools
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