Ambient Light Sensor Circuit Short to Ground
There's a short in the ambient light sensor circuit, causing incorrect readings.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The ambient light sensor measures light input to adjust interior lights. A short to ground means the sensor isn't working correctly, usually because of damaged wiring or connectors.
What the computer is actually seeing
The sensor should provide a voltage signal between 0.5V to 4.5V based on light levels. A short to ground forces the voltage drop to around 0V, indicating a faulty condition.
What a healthy reading looks like
Normal operation sees voltage ranging from 0.5V in dark conditions to 4.5V in bright conditions.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Inspect the ambient light sensor wiring for visible damage or wear.
- 2Check the connector for corrosion or bent pins. Repair as necessary.
- 3Disconnect the ambient light sensor and measure the voltage at the connector with key on. Expected is 0.5V to 4.5V based on light. If it's 0V, suspect wiring issues.
- 4Test the ambient light sensor by re-connecting it and blocking it briefly to observe voltage changes. If no change, replace the sensor.
Common causes
- Damaged wiring
- Corroded connectors
- Faulty ambient light sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but interior lighting may not function correctly.
Will this code come back after I clear it?
If the underlying issue isn't resolved, the code will return.
Why does this relate to my interior lights?
The sensor adjusts light levels in the cabin based on ambient light conditions.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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