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.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Activate the Panel Dimmer Switch.
4. Wait 30 seconds.
5. With the scan tool, read DTCs.
  Is the DTC active?
  
  Yes
  - Go to step 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 DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
CHECK THE (E2) PANEL LAMPS DIMMER SIGNAL CIRCUIT, AND THE (L900) HEADLAMP SWITCH MUX RETURN CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: Checking Panel Lamps Dimmer Signal And Headlamp Switch MUX Return Circuits For Short To Voltage
Courtesy of CHRYSLER LLC
1. Disconnect the Headlamp Switch harness connector.
2. Turn the ignition on.
3. Using a test light, measure for voltage on the (E2) Panel Lamps Dimmer Signal circuit.
4. Using a test light, measure for voltage on the (L900) Headlamp Switch MUX Return circuit.
  Is the voltage greater than 5 volts on the E2 or L900 circuit?
  
  Yes
  - Repair the E2 or the L900 for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
  No
  - Go to step 3
CHECK THE OPERATION OF THE PANEL LAMPS DIMMER SWITCH

Fig 2: Identifying Headlamp Switch Harness Connector
Courtesy of CHRYSLER LLC
1. Connect a jumper wire at the Headlamp Switch harness connector between the (E2) Panel Lamps Dimmer Signal circuit and the (L900) Headlamp Switch MUX Return circuit.
2. With the scan tool, read DTCs.
  Does the Scan tool display-B160A-PANEL DIMMER INPUT CIRCUIT LOW?
  
  Yes
  - 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
  No
  - Go to step 4
CHECK THE (L900) HEADLAMP SWITCH MUX RETURN CIRCUIT FOR AN OPEN

Fig 3: Checking Headlamp Switch MUX Return Circuit For Open
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Instrument Cluster C2 harness connector.
3. Measure the resistance of the (L900) Headlamp Switch MUX Return circuit between the Instrument Cluster C2 harness connector and the Headlamp Switch harness connector.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (L900) Headlamp Switch MUX Return circuit for an open.
  - Perform the BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure
  No
  - Go to step 5
CHECK THE (E2) PANEL LAMPS DIMMER SIGNAL CIRCUIT FOR AN OPEN

Fig 4: Checking Panel Lamps Dimmer Signal Circuit For Open
Courtesy of CHRYSLER LLC
1. Disconnect the Instrument Cluster C1 harness connector.
2. Measure the resistance of the (E2) Panel Lamps Dimmer Signal circuit between the Instrument Cluster C1 harness connector and the Headlamp Switch harness connector.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (E2) Panel Lamps Dimmer Signal circuit for an open.
  - 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