Test Step 8 - Check The HVAC Control Modules

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.

Fig 1: Checking HVAC Control Modules

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Ignition on, engine not running.
With the scan tool, erase HVAC DTCs.
Turn the ignition off to the lock position.
Reconnect the A/C Heater Control harness connector.
Connect a jumper wire between the (C800) 5-volt Supply circuit and the (C254) Rear Blend Signal circuit in the Rear A/C Heater Control C1 harness connector.
Ignition on, engine not running.
With the scan tool, read HVAC DTCs.

Does the scan tool display this DTC as active?

Yes

Replace the A/C Heater Control. Refer to REMOVAL AND INSTALLATION .
Perform the HVAC Verification Test. Refer to HVAC .

Replace the Rear A/C Heater Control. Refer to REMOVAL AND INSTALLATION .
Perform the HVAC Verification Test. Refer to HVAC .