Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

VERIFY DTC IS ACTIVE
NOTE:
Make sure the IOD fuse is installed and the battery is fully charged before proceeding.
1. Turn the ignition on.
2. With the scan tool, read active DTCs.
  Is this DTC active?
  
  Yes
  - Refer to U0164-LOST COMMUNICATION WITH HVAC CONTROL MODULE for 1500, 2500 & 3500 or U0164-LOST COMMUNICATION WITH HVAC CONTROL MODULE for 3500 CAB & CHASSIS, 4500 & 5500 . and perform the U0164-Lost Communication with HVAC Control Module.
  No
  - Perform the STORED LOST COMMUNICATION DTCS for 1500, 2500 and 3500, or STORED LOST COMMUNICATION DTCS for 3500 Cab & Chassis, 4500 and 5500 diagnostic procedure .