Hybrid Safety Procedures

Before you touch anything, identify the vehicle as a hybrid. Some hybrids have minimal badging and look identical to their conventional counterparts. Check the VIN, check for orange cables visible under the hood, check for the hybrid badge, and check the information display for battery and motor status screens. If the vehicle is a hybrid, high-voltage safety applies to every procedure that goes near the battery pack, drive motor, inverter, AC compressor (on many hybrids the AC compressor is HV-driven), or any orange cable.

Step 1: Put on Class 0 rated insulated rubber gloves with leather protectors over them. Inspect gloves for damage before every use — no cracks, tears, or punctures. Step 2: Disable the vehicle — set the ignition to OFF and remove the key or fob. For push-button start vehicles, place the fob in a shielded pouch away from the vehicle. Step 3: Disconnect the 12V auxiliary battery negative cable. Step 4: Locate the high-voltage service disconnect plug or switch. Location varies by manufacturer — find it in the service information before you start. It is typically near the battery pack — under the rear seat, in the trunk, or under the cargo area. Step 5: Remove the service disconnect plug while wearing your insulated gloves. Some disconnects require turning a handle. Some require pulling a plug. Step 6: Wait the manufacturer-specified capacitor discharge time — usually 5 to 10 minutes. The inverter capacitors hold a lethal charge after the disconnect is removed. Do not rush this step.

Step 7: After the wait period, use a CAT III rated digital multimeter capable of reading at least 1000 volts DC. Measure at the service disconnect terminals or at the HV bus access points specified by the manufacturer. You must read zero volts before touching any HV component. If you read any voltage — stop. Something is wrong. Re-verify your disconnect procedure. Never assume the system is de-energized. Verify with your own meter every time.

Every high-voltage cable on a hybrid is enclosed in orange conduit or has orange connectors. Orange means high voltage — period. Never cut, splice, open, or probe an orange cable or connector without following the full de-energization procedure first. Never run conventional 12V wiring near orange HV cables. Never use standard wire repair techniques on HV cables — they require manufacturer-specified connectors and repair procedures rated for the voltage.