Test Step 4 - Check the Sun Sensor
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2014 Volkswagen Routan, 2013 Volkswagen Routan, 2012 Volkswagen Routan, 2011 Volkswagen Routan, and 2010 Volkswagen Routan. However, it is still accessible from the selected car via links, so may be relevant.
- Reconnect the A/C heater control C1 harness connector.
- Turn the ignition ON.
- Using the scan tool, observe the auto headlamp signal while connecting a jumper wire between the auto headlamps signal circuit and the sensor ground circuit in the sun sensor harness connector.
Does the Auto Headlamp signal change from approximately 5 volts to 0 volts?
Yes
- Replace the sun sensor. Refer to REMOVAL AND INSTALLATION .
- Perform the HVAC Verification Test. Refer to HVAC .
No
- Replace the A/C heater control. Refer to REMOVAL AND INSTALLATION .
- Perform the HVAC Verification Test. Refer to HVAC .