B1433

Step 1: Perform visual inspection of wiper motor wiring harness, focusing on areas where wires contact metal body panels, hood hinges, or moving parts. Look for chafed, melted, or damaged wire insulation that could cause grounding.

Step 2: Locate and remove the wiper brake/run relay from the fuse/relay box. Inspect relay terminals and socket for corrosion, water damage, or pushed-back pins. Use a multimeter to test relay coil resistance (typically 70-120 ohms) and check for continuity between relay terminals and ground with relay removed.

Step 3: With relay removed and ignition off, disconnect the BCM connector controlling the wiper relay circuit. Using a multimeter set to resistance mode, measure resistance between the relay control wire at the relay socket and known good ground. Reading should be greater than 10k ohms; less than 100 ohms confirms short to ground in wiring.

Step 4: If wiring tests good, reconnect BCM and install a known-good relay. Clear codes and test wiper operation through all modes. If code returns immediately, suspect BCM internal driver circuit fault. If code does not return, monitor system and verify repair by operating wipers through multiple cycles.

Step 5: For intermittent faults, perform wiggle test on wiper motor harness and BCM connectors while monitoring live data for relay command voltage. Spray suspected areas with electrical contact cleaner and retest.