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 AN ACTIVE DTC
NOTE:
Before proceeding with this diagnostic process, verify the proper connection of the Multifunction Switch harness connector. A loose connection at this connector will cause this DTC to set.
1. Turn the ignition off.
2. Gently pull the Multifunction Switch connector harness to verify the locking tab is fully engaged. If the connector locking tab is not fully engaged, push to seat the connector locking tab.
3. Turn the ignition on.
4. Wait 30 seconds.
5. With the scan tool, read DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2.
  No
  - The condition that caused this code to set is not present at this time. 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.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.
(D506) LIN BUS CIRCUIT OPEN

Fig 1: Checking LIN Bus Circuit Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Multifunction Switch harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (D506) LIN BUS circuit.
  Is the voltage above 5 volts?
  
  Yes
  - Go To 3.
  No
  - Repair the (D506) LIN BUS circuit for an 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.
(F943) FUSED IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN

Fig 2: Checking Fused Ignition Run/Start Control Output Circuit For Open
Courtesy of CHRYSLER LLC
1. Measure the voltage of the (F943) Fused Ignition Run/Start Control Output circuit.
  Is the voltage above 10 volts?
  
  Yes
  - Go To 4.
  No
  - Repair the (F943) Fused Ignition Run/Start Control Output circuit for an open. Inspect the related fuse. If the fuse is open, check the circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.
(A412) FUSED B(+) (I.O.D.) CIRCUIT OPEN

Fig 3: Checking Fused B(+) I.O.D.) Circuit For Open
Courtesy of CHRYSLER LLC
1. Measure the voltage of the (A412) Fused B(+) (I.O.D.) circuit.
  Is the voltage above 10 volts?
  
  Yes
  - Go To 5.
  No
  - Repair the (A412) Fused B(+) (I.O.D.) circuit for an open. Inspect the related fuse. If the fuse is open, check the circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.
(Z911) GROUND CIRCUIT OPEN

Fig 4: Checking Ground Circuit Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Measure the resistance between ground and the (Z911) Ground circuit.
  Is the resistance below 10K Ohms?
  
  Yes
  - Replace the Multifunction 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
  - Repair the (Z911) Ground circuit for an 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.