B1456

Step 1: Perform visual inspection of instrument cluster wiring harness and connectors for signs of damage, melting, pinching, or chafing particularly where harnesses pass through firewall, under dash mounts, or near metal edges. Check for any recent repair work or accessory installations.

Step 2: Disconnect the BCM connector and locate the washer fluid lamp control wire (consult vehicle-specific wiring diagram). Using a digital multimeter, measure voltage on the lamp control wire with ignition on - it should read 0V or very low voltage. If battery voltage is present, the short is between the BCM and the lamp.

Step 3: Disconnect the instrument cluster connector and repeat voltage measurement at the BCM side of the lamp control wire. If voltage disappears, the short is internal to the instrument cluster. If voltage remains, the short is in the harness between BCM and cluster.

Step 4: If harness short is confirmed, carefully inspect and trace the entire wire run, checking for pinch points, aftermarket splices, and contact with power sources. Repair or replace damaged sections of harness as needed.

Step 5: After repairs, reconnect all components, clear the code, and verify the washer fluid lamp operates correctly based on actual fluid level. Monitor for code recurrence during test drive and lamp function test.