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 DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE NOTE:
Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
- With the scan tool, read active Cluster 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 diagnostic procedure.
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.
- With the scan tool, read active Cluster DTCs.