Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR ACTIVE DTC
1. Turn the ignition on.
2. Turn the Headlamps on.
3. With the scan tool, read the DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 2.
  No
  - The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
HEADLAMP SWITCH

Fig 1: Checking Headlamp/Fog Lamp Switch Signal Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the Headlamp Switch harness connector.
2. Turn the ignition on.
3. Measure the voltage of the (L116) Headlamp / Fog Lamp Switch Signal circuit.
  Does the voltage read 5.0 volts?
  
  Yes
  - Replace the Headlamp Switch in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3.
(L116) HEADLAMP / FOG LAMP SWITCH SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 2: Checking Headlamp / Fog Lamp Switch Signal Circuit For A Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Headlamp Switch harness connector.
3. Disconnect the Instrument Cluster C3 harness connector.
4. Measure the resistance of the (L116) Headlamp Switch Signal circuit to ground.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair short to ground on the (L116) Headlamp / Fog Lamp Switch Signal circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Cluster in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .