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
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 for 1500, 2500 & 3500, or BODY VERIFICATION TEST for 3500 CAB & CHASSIS, 4500 & 5500.
(L116) HEADLAMP / FOG LAMP SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking Headlamp/Fog Lamp Switch Signal Circuit Shorted To Voltage
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Headlamp Switch harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (L116) Headlamp / Fog Lamp Switch Signal circuit.
  Is the voltage above 10.0 volts?
  
  Yes
  - Repair the (L116) Headlamp / Fog Lamp Switch Signal 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.
HEADLAMP SWITCH

Fig 2: Checking Headlamp/Fog Lamp Switch Connector End View
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Headlamp Switch harness connector.
3. Connect a jumper wire to the (L116) Headlamp / Fog Lamp Switch Signal circuit at the Headlamp Switch harness connector.
4. Turn the ignition on.
5. With the scan tool, read the DTCs.
  Does the scan tool display DTC: B1607-HEADLAMP SWITCH INPUT CIRCUIT LOW?
  
  Yes
  - Replace the Headlamp 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.
(L116) HEADLAMP / FOG LAMP SWITCH SIGNAL CIRCUIT OPEN

Fig 3: Checking Headlamp/Fog Lamp Switch Signal Circuit Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Headlamp Switch harness connector.
3. Disconnect the Cluster C3 harness connector.
4. Measure the resistance of the (L116) Headlamp / Fog Lamp Switch Signal circuit.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - 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.
  No
  - Repair the (L116) Headlamp / Fog Lamp Switch Signal 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.