Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Sun Load Sensor Failure
Monitored & Set Condition
- When Monitored: With the ignition on.
- Set Condition: The BCM detects an abnormally low voltage on the sun sensor signal.
Possible Causes:
- Sun Sensors
- Sun Sensor Signal Circuits Short To Ground
- Sun Sensor Signal Circuit Short To Sensor Ground
- Body Control Module - Sun Sense Low
Testing
- Disconnect the sun sensor/VTSS LED harness connector. See Figure . With the scan tool, read the sun sensor voltage. If the voltage is .2 volt or less, go to next step. If the voltage is .2 volt or more, replace the sun sensor. See SUN SENSORΒ under REMOVAL & INSTALLATION.
- Disconnect the BCM C1 & C2 harness connectors. See Figure and Figure . Measure the resistance between ground and the sun sensor signal circuit. If the resistance is 100 ohms or less, repair the sun sensor signal circuit for a short to ground. If the resistance is 100 ohms or more, go to next step.
- Measure the resistance between the sun sensor circuit and the sensor ground circuit at the sun sensor connector. If the resistance is 100 ohms or less, repair the sun sensor signal circuit for a short to the sensor ground circuit. If the resistance is 100 ohms or more replace the BCM. See BODY CONTROL MODULEΒ under REMOVAL & INSTALLATION.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.
