What Does B1451 Mean?
This code indicates the Body Control Module (BCM) has detected an open circuit in the wiper wash/delay switch input circuit. The BCM continuously monitors the resistance and voltage signals from the multifunction switch that controls wiper delay intervals and washer functions. When the expected voltage or continuity is not present on this circuit, the BCM sets this fault code indicating a break in the electrical pathway between the switch and the control module.
Common Causes
45%
Faulty multifunction switch or wiper control stalk with internal open circuit or worn contacts
30%
Broken or damaged wiring harness between multifunction switch and BCM, including chafed insulation or corroded terminals
15%
Loose, corroded, or damaged electrical connector at multifunction switch or BCM connector pins
10%
Failed Body Control Module with internal circuit fault on wiper switch input channel
Diagnostic Steps
1
Step 1: Perform visual inspection of the multifunction switch connector at the steering column and BCM connector for corrosion, bent pins, moisture intrusion, or loose terminals. Check wiring harness for visible damage, chafing, or breaks along the steering column and under the dashboard.
2
Step 2: Using a digital multimeter, backprobe the wiper delay switch circuit at the multifunction switch connector with ignition ON. Verify battery voltage is present on the power supply pin. Cycle through different wiper delay positions and measure resistance or voltage changes at the signal wire per manufacturer specifications (typically 0-12V or varying resistance values).
3
Step 3: If no signal changes are detected when operating the switch, disconnect the multifunction switch connector and measure resistance across the switch terminals directly while cycling through all wiper delay positions. Compare readings to factory specifications to confirm switch internal operation.
4
Step 4: If switch tests good, perform continuity test between the multifunction switch connector signal pin and the corresponding BCM connector pin with both connectors disconnected and ignition OFF. Resistance should be less than 1 ohm. Check for short to ground (should be infinite resistance) and short to power.
5
Step 5: If all wiring and switch test within specifications, inspect BCM connector terminals for corrosion or pushback. If terminals are intact, suspect BCM internal fault. Clear codes, reconnect all components, and test wiper delay function operation to verify repair.
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an open circuit in the wiper wash/delay switch input circuit. The BCM continuously monitors the resistance and voltage signals from the multifunction switch that controls wiper delay intervals and washer functions. When the expected volt...
The most common cause of B1451 (Wiper Wash/Delay Switch Circuit Open) is: Faulty multifunction switch or wiper control stalk with internal open circuit or worn contacts
Typical repair costs for B1451 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this does not affect vehicle operation or braking systems. However, wiper delay functionality may be inoperative or stuck in one mode, which could impact visibility during inclement weather. Repair when convenient, prioritize before rainy season or winter conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1451 to identify the root cause.
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Quick Info
Category
Body
System
Body Electronics/Wiper-Washer System
Difficulty
Type
Manufacturer
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