Test Step 1 - Test for Intermittent Condition
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.
- Turn the ignition ON.
- With the scan tool, erase all DTC's.
- Operate the rear defrost switch several times.
- Cycle the ignition from ON to OFF.
- Turn the ignition ON.
- With the scan tool, read DTC's.
Does the scan tool display B1016 Rear Defrost Switch Request Input Circuit Low?
Yes
- Replace the A/C heater control. Refer to REMOVAL AND INSTALLATION .
- Perform the HVAC Verification Test. Refer to HVAC .
No
- The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
- Perform the HVAC Verification Test. Refer to HVAC .