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) RADIATOR FAN CONTROL RELAY OPERATION
NOTE: When actuating the radiator fan relays, the Radiator Fan(s) may have a delay in operation and ramp up slowly.

Ignition on, engine not running.

With a scan tool, select Radiator Cooling Fan Relay #1 Control State to actuate the Radiator Fan Control Relay.

Is the Cooling Fan Relay operating?

Yes
1. Refer to INTERMITTENT CONDITION
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 2).
2) FUSED B+ CIRCUITS

Fig 1: Checking Radiator Fan Control Relay Fused B+ Circuits
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Remove the Radiator Fan Control Relay.

Using a 12-volt test light connected to ground, probe the Fused B+ circuits.

Is the voltage above 11.0 volts?

Yes
1. Go To 3).
No
1. Repair the open or short to ground in the Fused B+ circuits. Inspect the related fuse and repair as necessary.
2. Perform BODY VERIFICATION TEST - VER 1 .
3) RADIATOR FAN CONTROL RELAY CONTROL CIRCUIT

Fig 2: Checking Radiator Fan Control Relay Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition on, engine not running.

With a scan tool, select Radiator Cooling Fan Relay #1 Control State, Toggle, to actuate the Radiator Fan Control Relay.

Using a 12-volt test light connected to battery voltage, probe the Radiator Control Relay Control circuit in the PDM.

Does the test light illuminate and flash on and off?

Yes
1. Replace the Radiator Fan Control Relay.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go To 4).
4) (N201) RADIATOR FAN CONTROL RELAY CONTROL CIRCUIT OPEN

Fig 3: Checking Radiator Fan Control Relay Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Remove the FCM from the PDM.

Measure the resistance of the (N201) Radiator Fan Control Relay Control circuit from the Relay to the FCM PDM - 49 way connector.

Is the resistance below 5.0 ohms?

Yes
1. Go To 5).
No
1. Replace the PDM in accordance with the Service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
5) (N201) RADIATOR FAN CONTROL RELAY CONTROL CIRCUIT SHORTED TO GROUND

Fig 4: Checking Radiator Fan Control Relay Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between ground and the (N201) Radiator Fan Control Relay Control circuit at the Relay connection.

Is the resistance below 100 ohms?

Yes
1. Replace the PDM in accordance with the Service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace Front Control Module in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .