Use Claude's Vision to Analyze Wiring Diagrams

Go to claude.ai in your phone's browser. Sign in to your account. Bookmark the page for quick access. You can also download the Claude app from the App Store or Google Play.

What you should see: The Claude chat interface with a message box at the bottom and a paperclip/attachment icon for uploading images.

Open your wiring diagram source (AllData on a tablet, a printed factory manual, or a laptop screen). Take a photo with your phone. Key tips for a usable photo:

• Hold your phone steady and perpendicular to the diagram — no tilted angles
• Make sure the entire circuit is visible in the frame — Claude needs to see the full path from power source to ground
• Zoom in if the diagram is large — it's better to take 2–3 photos of sections than one blurry full-page shot
• Adequate lighting matters — avoid glare from overhead shop lights

What you should see: A clear photo where individual wire colors, component labels, and connector numbers are legible.

In the Claude message box, click the paperclip icon (or the "+" in the mobile app). Select your wiring diagram photo from your phone's camera roll. It will appear as a thumbnail above your message box.

Below the uploaded photo, type your question. Use this format:

This is a wiring diagram for [system name] on a [year/make/model]. I have [DTC code or symptom].

Please explain:
1. How this circuit works (power source, control module, component, and ground path)
2. What the most likely failure points are for my fault
3. Where I should probe first with my multimeter
4. What reading should I expect at each test point if the circuit is good

What you should see: Claude will analyze the image and provide a text response walking through the circuit logic, identifying key components in the diagram by their label/position, and giving you a specific test sequence.

After the initial analysis, ask follow-up questions about specific parts of the diagram:

• "Where exactly is connector C115 in this diagram?"
• "Is there a splice point that could affect multiple components at once?"
• "What would cause intermittent loss at this connector vs. complete open circuit?"
• "If power is good at pin 4 but the module isn't responding, what does that mean?"

Troubleshooting: If Claude says "I can't clearly see [specific part]", retake the photo with better lighting or zoom into that section specifically. You can upload multiple photos to the same conversation — Claude will reference all of them.

Use Claude's analysis as your starting framework, then verify with your multimeter and scan tool. Never skip physical testing just because the AI gave you a likely answer — electrical faults always need confirmation at the wire.