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.

CHECK FOR ACTIVE DTC
NOTE:
Before proceeding with this diagnostic procedure, verify the Left and Right Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set.
1. With the scan tool, read the active DTCs.
2. Turn the ignition on.
3. With the scan tool, read the active DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 3.
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
(X20) RADIO CONTROL MUX CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking Radio Control MUX Circuit Shorted To Voltage
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Cluster C3 harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (X20) Radio Control MUX circuit.
  Is the voltage above 10.0 volts?
  
  Yes
  - Repair the (X20) Radio Control MUX circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.
  No
  - Go To 3.
LEFT REMOTE RADIO SWITCH
1. Turn the ignition off.
2. Connect the Cluster C3 harness connector.
3. Disconnect the Left Remote Radio Switch harness connector.
4. Connect a 5 Amp fused jumper wire between cavity 1 and cavity 2 in the Left Remote Radio Switch harness connector.
5. Turn the ignition on.
6. With the scan tool monitor the Remote Radio Control Switch voltage.
  Is the voltage below 1.0 volt?
  
  Yes
  - Replace the Left Remote Radio Switch in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.
  No
  - Go To 4.
RIGHT REMOTE RADIO SWITCH
1. Turn the ignition off.
2. Connect the Left Remote Radio Switch harness connector.
3. Disconnect the Right Remote Radio Switch harness connector.
4. Connect a 5 A fused jumper wire between cavity 1 and cavity 2 in the Right Remote Radio Switch harness connector.
5. Turn the ignition on.
6. With the scan tool monitor the Remote Radio Control Switch voltage.
  Is the voltage below 1.0 volt?
  
  Yes
  - Replace the Right Remote Radio Switch in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.
  No
  - Go To 5.
(X20) RADIO CONTROL MUX CIRCUIT OPEN

Fig 2: Radio Control MUX Circuit Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Left Remote Radio Switch harness connector.
3. Disconnect the Cluster C3 harness connector.
4. Measure the resistance of the (X20) Radio Control MUX circuit.
  Are the resistances above 5.0 Ohms?
  
  Yes
  - Go To 6.
  No
  - Replace the Cluster in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.
(X20) RADIO CONTROL MUX CIRCUIT OPEN BETWEEN REMOTE RADIO SWITCHES AND CLOCKSPRING

Fig 3: Radio Control MUX Circuit Open Between Remote Radio Switches And Clockspring
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Clockspring C8 harness connector.
3. Measure the resistance of the (X20) Radio Control MUX circuit.
  Are the resistances above 5.0 Ohms?
  
  Yes
  - Repair the (X20) Radio Control MUX circuit for a open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.
  No
  - Go To 7.
(X20) RADIO CONTROL MUX CIRCUIT OPEN BETWEEN CLOCKSPRING AND CLUSTER

Fig 4: Radio Control MUX Circuit Open Between Clockspring And Cluster
Courtesy of CHRYSLER LLC
1. Disconnect the Clockspring C2 harness connector.
2. Measure the resistance of the (X20) Radio Control MUX circuit.
  Is the resistance above 5 Ohms?
  
  Yes
  - Repair the (X20) Radio Control MUX circuit for a open.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.
  No
  - Replace the Clockspring in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.