Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

1) CHECK FOR AN ACTIVE DTC
Turn the ignition on.

With the scan tool, record and erase DTCs.

Activate the Panel Dimmer Switch.

Wait 30 seconds.

With the scan tool, read DTCs.

Is the DTC active?

Yes
1. Go To 2).
No
1. 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.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1) .
2) CHECK THE (E2) PANEL LAMPS DIMMER SIGNAL CIRCUIT, AND THE (L900) HEADLAMP SWITCH MUX RETURN CIRCUIT FOR A SHORT TO VOLTAGE

Fig 1: Measuring Voltage On Panel Lamps Dimmer Signal & Headlamp Switch MUX Return Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the Headlamp Switch harness connector.

Turn the ignition on.

Using a test light, measure for voltage on the (E2) Panel Lamps Dimmer Signal circuit.

Using a test light, measure for voltage on the (L900) Headlamp Switch MUX Return circuit.

Is voltage present on the E2 or L900 circuit?

Yes
1. Repair the E2 or the L900 for a short to voltage.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1) .
No
1. Go To 3).
3) CHECK THE OPERATION OF THE PANEL LAMPS DIMMER SWITCH

Fig 2: Checking Operation Of Panel Lamps Dimmer Switch
Courtesy of DAIMLERCHRYSLER CORP.

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.

With the scan tool, read DTCs.

Does the Scan tool display-B160A-PANEL DIMMER INPUT CIRCUIT LOW?

Yes
1. Replace the Headlamp Switch in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1) .
No
1. Go To 4).
4) CHECK THE (L900) HEADLAMP SWITCH MUX RETURN CIRCUIT FOR AN OPEN

Fig 3: Measuring Resistance Of Headlamp Switch MUX Return Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Instrument Cluster C2 harness connector.

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
1. Repair the (L900) Headlamp Switch MUX Return circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1) .
No
1. Go To 5).
5) CHECK THE (E2) PANEL LAMPS DIMMER SIGNAL CIRCUIT FOR AN OPEN

Fig 4: Measuring Resistance Of Panel Lamps Dimmer Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the Instrument Cluster C1 harness connector.

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
1. Repair the (E2) Panel Lamps Dimmer Signal circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1) .
No
1. Replace the Instrument Cluster in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1) .