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.

INTERMITTENT CONDITION
1. Turn the ignition on.
2. Using the scan tool, clear all CCN DTCs.
3. Turn the Headlamps on.
4. Using the scan tool, read the DTC information.
  Does the scan tool read: B1607-HEADLAMP SWITCH INPUT CIRCUIT LOW?
  
  Yes
  - Go to step 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 DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
HEADLAMP SWITCH
1. Disconnect the Headlamp Switch connector.
2. Turn the ignition on.
3. Measure the voltage of the (L900) MUX Return circuit.
  Does the voltage read 5.0 Volts?
  
  Yes
  - Go to step 3
  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 .
(L900) MUX RETURN CIRCUIT

Fig 1: Checking Mux Return Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Headlamp Switch connector.
3. Disconnect the Instrument Cluster C2 connector.
4. Measure the resistance of the (L900) MUX Return circuit to ground.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Repair the (L900) Headlamp MUX return circuit.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
  No
  - Replace the Instrument Cluster in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .