When a blower fan runs slow while all other electrical loads function normally, what is the next step per the I-CAR Troubleshooting Flowchart?

• A. Inspect the blower relay
• B. Check the fuse for the circuit
• C. Find the wiring diagram for that circuit
• D. Test the blower motor current directly

Answer: (C)

The important idea here is using the circuit map before testing individual components. When a blower runs slow but all other electrical loads are normal, you want to understand how that circuit is supposed to be wired and powered. The flowchart guides you to locate the wiring diagram for the blower circuit. That diagram shows where power comes from (fuse and relay), the path to the motor, connector pins, and any resistors or control devices involved. It also indicates expected voltages and current ranges at different blower speeds. With that map, you can plan targeted tests—confirming power delivery along the correct path, checking the correct fuse/relay are in play, and knowing what readings to expect at the blower connector. This prevents guessing and directs you to the right areas to test next.

Choosing to test the relay, check the fuse, or measure the motor current directly without first consulting the circuit diagram can lead to unnecessary or misfocused checks. The diagram provides the essential context—where power should travel and what you should see—so subsequent tests are meaningful and efficient.