What Does B1458 Mean?
This code indicates the Body Control Module (BCM) has detected an electrical fault in the windshield washer pump motor relay control circuit. The BCM monitors the relay coil circuit and has identified an open circuit, short to ground, short to power, or excessive resistance preventing proper relay operation. This prevents the washer pump from receiving power when activated.
Common Causes
35%
Faulty washer pump relay with internal coil failure or damaged contacts
30%
Damaged wiring harness or corroded connectors between BCM and washer pump relay
20%
Failed washer pump motor creating excessive current draw or short circuit
10%
Blown fuse or fusible link in washer pump relay power supply circuit
5%
Internal BCM relay driver circuit failure
Diagnostic Steps
1
Step 1: Locate the washer pump relay (typically in underhood or cabin fuse/relay box) and visually inspect for physical damage, corrosion, or burnt contacts. Check the relay socket for melted terminals or corrosion.
2
Step 2: Remove the relay and use a multimeter to test relay coil resistance (typically 70-90 ohms between coil terminals) and verify continuity across normally-open contacts. Apply 12V to coil terminals and verify contacts close with audible click.
3
Step 3: With relay removed, use a multimeter to verify battery voltage at relay power supply terminal (key on) and check BCM control circuit for proper ground signal when washer switch is activated. Expected voltage drop from 12V to near 0V when activated.
4
Step 4: Test washer pump motor directly by applying 12V power and ground. Motor should run smoothly and draw 2-5 amps typically. Check pump ground circuit for resistance (should be less than 1 ohm to chassis ground).
5
Step 5: Inspect all wiring between BCM, relay, and washer pump for chafing, breaks, or water intrusion. Pay special attention to areas where harness passes through body panels or near moving components.
6
Step 6: After repairs, clear codes and cycle washer system multiple times while monitoring live data for relay command signal and voltage feedback. Verify no codes return and proper operation under various conditions.
Estimated Repair Cost
$75 - $350
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an electrical fault in the windshield washer pump motor relay control circuit. The BCM monitors the relay coil circuit and has identified an open circuit, short to ground, short to power, or excessive resistance preventing proper relay o...
The most common cause of B1458 (Wiper Washer Pump Motor Relay Circuit Failure) is: Faulty washer pump relay with internal coil failure or damaged contacts
Typical repair costs for B1458 range from $75 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this only affects windshield washer function. However, repair should be completed promptly as windshield washer operation is legally required in most jurisdictions and essential for maintaining visibility in poor weather or road conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1458 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System
Difficulty
Type
Manufacturer
Recommended Tools
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