What Does B2180 Mean?
This code indicates the Body Control Module (BCM) has detected an abnormal short circuit to ground in the front wiper select switch 'B' circuit. The switch signal voltage is reading lower than expected, typically near zero volts, when it should be at a reference voltage. This occurs when the wiper switch circuit is unintentionally grounded through damaged wiring, a faulty switch, or connector corrosion.
Common Causes
40%
Damaged or chafed wiring harness between wiper switch and BCM causing short to ground
30%
Faulty front wiper multifunction switch with internal short circuit
20%
Corroded or moisture-damaged connector pins at wiper switch or BCM
10%
Failed Body Control Module with internal circuit fault
Diagnostic Steps
1
Step 1: Perform visual inspection of wiper switch wiring harness from switch to BCM, checking for chafed insulation, pinched wires, water intrusion, or damaged connectors especially near hinge points and steering column areas
2
Step 2: Disconnect wiper switch connector and measure resistance between the 'B' circuit terminal and ground with multimeter - should read open circuit (infinite resistance). If reading continuity (0-5 ohms), wiring harness has short to ground
3
Step 3: If wiring shows no short, inspect wiper switch connector terminals for corrosion, bent pins, or moisture damage. Clean with electrical contact cleaner and dielectric grease if corrosion present
4
Step 4: With switch disconnected, measure resistance of wiper switch 'B' circuit terminal to switch housing ground - should read open circuit. If continuity exists, replace wiper switch assembly
5
Step 5: If all wiring and switch test normal, check BCM connector terminals for corrosion or damage. Measure voltage supply at BCM side of circuit with key on - should show reference voltage (typically 5V or 12V depending on design)
6
Step 6: Clear codes, reconnect all components, cycle wiper switch through all positions, and verify code does not return. If code returns with known good wiring and switch, BCM replacement may be necessary
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an abnormal short circuit to ground in the front wiper select switch 'B' circuit. The switch signal voltage is reading lower than expected, typically near zero volts, when it should be at a reference voltage. This occurs when the wiper s...
The most common cause of B2180 (Front Wiper Select Switch "B" Short to Ground) is: Damaged or chafed wiring harness between wiper switch and BCM causing short to ground
Typical repair costs for B2180 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive in clear weather conditions, but wipers may not function properly or may operate erratically, creating safety hazard during rain or snow. Repair within 1-2 weeks or before inclement weather is expected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2180 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System - Wiper/Washer
Difficulty
Type
Generic (SAE)
Recommended Tools
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