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 (L24) AUTO HEADLAMPS SIGNAL CIRCUIT VOLTAGE

Fig 1: Measuring Voltage Of Auto Headlamps Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the Sun Sensor harness connector.

Turn the ignition on.

Measure the voltage of the (L24) Auto Headlamps Signal circuit.

What voltage is present?

Above 5.2 Volts
1. Go To 2).
4.8 Volts to 5.2 Volts
1. Go To 3).
Below 4.8 Volts
1. Go To 5).
2) CHECK (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Fig 2: Measuring Voltage Of Auto Headlamps Signal Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the A/C Heater Control C1 harness connector.

Turn the ignition on.

Measure the voltage of the (L24) Auto Headlamps Signal circuit.

Is the voltage above 0.2 volts?

Yes
1. Repair the (L24) Auto Headlamps Signal circuit for a short to voltage.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .
No
1. Replace the A/C Heater Control in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .
3) CHECK (G939) SUN SENSOR RETURN CIRCUIT FUNCTION

Fig 3: Checking Sun Sensor Return Circuit Function
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Connect a jumper wire between the (L24) Auto Headlamps Signal circuit and the (G939) Sun Sensor Return circuit in the Sun Sensor harness connector.

Turn the ignition on.

With the scan tool in HVAC, select Data Display and read the Ambient Light Sensor voltage.

Is the voltage below 0.2 volts?

Yes
1. Replace the Sun Sensor in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .
No
1. Go To 4).
4) CHECK (G939) SUN SENSOR RETURN CIRCUIT FOR AN OPEN

Fig 4: Checking Sun Sensor Return Circuit For Open
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the A/C Heater Control C1 harness connector.

Measure the resistance of the (G939) Sun Sensor Return circuit between the Sun Sensor harness connector and the A/C Heater Control C1 harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Replace the A/C Heater Control in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .
No
1. Repair the (G939) Sun Sensor Return circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .
5) CHECK (L24) AUTO HEADLAMPS SIGNAL CIRCUIT FOR AN OPEN

Fig 5: Checking Auto Headlamps Signal Circuit For Open
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the A/C Heater Control C1 harness connector.

Measure the resistance of the (L24) Auto Headlamps Signal circuit between the Sun Sensor harness connector and the A/C Heater Control C1 harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Replace the A/C Heater Control in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .
No
1. Repair the (L24) Auto Headlamps Signal circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .