Diagnostic Test

WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

TEST FOR INTERMITTENT CONDITION
NOTE: Prior to testing, check and inspect that all applicable fuses are functional and working properly.
1. With the scan tool, record and erase DTCs
2. Operate the Fog Lamp Switch several times.
3. Turn the ignition on and wait 30 seconds.
4. With the scan tool, read DTCs.
  Does the scan tool display: B168F-FRONT FOG LAMP SWITCH STUCK?
  
  Yes
  - Go to step 2
  No
  - The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
HEADLAMP SWITCH SHORTED
1. With the scan tool, erase DTCs.
2. Disconnect the Headlamp Switch connector.
3. With the scan tool, read DTCs.
  Does the scan tool display: B168F-FRONT FOG LAMP SWITCH STUCK?
  
  No
  - Replace the Headlamp Switch in accordance with the service information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  Yes
  - Go to step 3
(L307) HEADLAMP SWITCH MUX CIRCUIT SHORT TO GROUND

Fig 1: Checking Headlamp Switch Mux Circuit For Short To Ground
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Cluster C1 connector.
3. Measure the resistance between ground and the (L307) Headlamp Switch Mux circuit.
  Is the resistance below 10000.0 Ohms?
  
  Yes
  - Repair the (L307) Headlamp Switch Mux circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Go to step 4
(L307) SWITCH MUX CIRCUIT SHORT TO (L900) SWITCH RETURN CIRCUIT

Fig 2: Checking For Short Between Switch MUX And Switch Return Circuits
Courtesy of CHRYSLER LLC
1. Disconnect the Cluster C2 connector.
2. Measure the resistance between the (L307) Switch Mux circuit and the (L900) Switch Return circuit.
  Is the resistance below 10000.0 Ohms?
  
  Yes
  - Repair the (L307) Switch Mux circuit for a short to the (L900) Switch Return circuit.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Replace the Instrument Cluster.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .