Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Solar Sensor: Description and Operation




The photo sensor is located by the driver side defrost nozzle. In response to photo intensity level in vehicle, the sensor will send signal to control module to control the blower level and discharge temperature.






NOTE: Emit intensive light toward driver side and passenger side using a lamp, and check the voltage change between terminals 1 & 2.