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) VERIFY THAT THE DTC IS ACTIVE
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.

NOTE: If the FCM detects and stores a DTC, the FCM also stores the environmental conditions under which the DTC was set.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

Turn the ignition on.

With the scan tool, erase FCM DTCs.

With the scan tool, actuate the PTC No. 1 Relay.

Monitor the scan tool for at least two minutes.

With the scan tool, read FCM DTCs.

Is the status Active for this DTC?

Yes
1. Go To 2).
No
1. Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
2) CHECK PTC NO. 1 RELAY

Fig 1: Checking PTC No. 1 Relay
Courtesy of DAIMLERCHRYSLER CORP.

With the scan tool, erase FCM DTCs.

Turn the ignition off.

Remove the PTC No. 1 Relay.

Turn the ignition on.

With the scan tool, actuate the PTC No. 1 Relay.

With the scan tool, read FCM DTCs.

NOTE: The scan tool should display an open circuit DTC with the PTC No. 1 Relay removed.

Does the scan tool display: B10B5-CABIN HEATER 1 CONTROL CIRCUIT HIGH?

Yes
1. Go To 3).
No
1. Replace the PTC No. 1 Relay in accordance with the Service Information.
2. Perform the BODY VERIFICATION TEST VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .
3) CHECK (K360) PTC NO. 1 RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

Fig 2: Checking PTC No. 1 Relay Control Circuit For A Short To Voltage
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the FCM from the Power Module.

Remove the ASD Relay from the IPM.

Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector.

Turn the ignition on.

Measure the voltage of the (K360) PTC No. 1 Relay Control circuit in the PTC No. 1 Relay connector.

Is there any voltage present?

Yes
1. Repair the (K360) PTC No. 1 Relay Control circuit for a short to voltage.
2. Perform the BODY VERIFICATION TEST VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .
No
1. Go To 4).
4) CHECK (K360) PTC NO. 1 RELAY CONTROL CIRCUIT FOR AN OPEN OR HIGH RESISTANCE

Fig 3: Checking PTC No. 1 Relay Control Circuit For An Open Or High Resistance
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Measure the resistance of the (K360) PTC No. 1 Relay Control circuit between the PTC No. 1 Relay connector and the FCM connector.

Is the resistance below 10.0 ohms?

Yes
1. Go To 5).
No
1. Repair the (K360) PTC No. 1 Relay Control circuit for an open or high resistance.
2. Perform the BODY VERIFICATION TEST VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .
5) INSPECT RELATED WIRING & CHECK FOR TSBs
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the PTC No. 1 Relay and the FCM.

Look for any chafed, pierced, pinched, or partially broken wires.

Look for broken, bent, pushed out or corroded terminals.

Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes
1. Repair as necessary.
2. Perform the BODY VERIFICATION TEST VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .
No
1. Replace the FCM in accordance with the Service Information.
2. Perform the BODY VERIFICATION TEST VER 1. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING) .