Dodge Nitro. Manual — part 717

Replace the PTC No. 1 Relay in accordance with the Service Information.

Perform BODY VERIFICATION TEST - VER 1 .

5) INSPECT RELATED WIRING & CHECK FOR TSBs

Turn the ignition off.

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

Repair as necessary.

Perform BODY VERIFICATION TEST - VER 1 .

No

Replace the FCM in accordance with the Service Information.

Perform BODY VERIFICATION TEST - VER 1 .

B10B8-CABIN HEATER 2 CONTROL CIRCUIT LOW (TIPM)

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article.

When Monitored:

With the ignition on, the ASD Relay energized, and the PTC No. 2 Relay command on.

Set Condition:

If the Front Control Module (FCM) detects that the (K361) PTC No. 2 Relay Control circuit is shorted to
ground.

Possible Causes

(K342) FUSED ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE
(K361) PTC NO. 2 RELAY CONTROL CIRCUIT SHORTED TO GROUND
(K361) PTC NO. 2 RELAY CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
PTC NO. 2 RELAY

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

Diagnostic Test

1) VERIFY THAT THE DTC IS ACTIVE

Turn the ignition on.

With the scan tool, erase FCM DTCs.

With the scan tool, actuate the PTC No. 2 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

Go to 2).

No

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 (K342) FUSED ASD RELAY OUTPUT CIRCUIT FOR AN OPEN OR HIGH
RESISTANCE

Turn the ignition off.

Remove the PTC No. 2 Relay.

Turn the ignition on.

FRONT CONTROL MODULE (FCM)

WARNING:

When the engine is operating, do not stand in 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.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

Using a 12 volt test light connected to ground, check the (K342) Fused ASD Relay Output circuit in the
PTC No. 2 Relay harness connector.

Does the test light illuminate brightly?

Yes

Go to 3).

No

Repair the (K342) Fused ASD Relay Output circuit for an open or high resistance.

Perform BODY VERIFICATION TEST - VER 1 .

3) CHECK (K361) PTC NO. 2 RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND

Turn the ignition off.

Disconnect the FCM from the Power Module.

Measure the resistance between ground and the (K361) PTC No. 2 Relay Control circuit in the PTC No. 2
Relay connector.

Is the resistance above 10.0 ohms?

Yes

Go to 4).

No

Repair the (K361) PTC No. 2 Relay Control circuit for a short to ground.

Perform BODY VERIFICATION TEST - VER 1 .

4) CHECK (K361) PTC NO. 2 RELAY CONTROL CIRCUIT FOR AN OPEN OR HIGH
RESISTANCE

Measure the resistance of the (K361) PTC No. 2 Relay Control circuit between the PTC No. 2 Relay
connector and the FCM connector.

Is the resistance below 10.0 ohms?

Yes

NOTE:

The test light should illuminate brightly. Compare the brightness to that of
a direct connection to the battery.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

Go to 5).

No

Repair the (K361) PTC No. 2 Relay Control circuit for an open or high resistance.

Perform BODY VERIFICATION TEST - VER 1 .

5) CHECK PTC NO. 2 RELAY

Install the FCM.

Install a substitute PTC No. 2 Relay in place of the vehicle's PTC No. 2 Relay.

Turn the ignition on.

With the scan tool, erase FCM DTCs.

With the scan tool, actuate the PTC No. 2 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

Go to 6).

No

Replace the PTC No. 2 Relay in accordance with the Service Information.

Perform BODY VERIFICATION TEST - VER 1 .

6) INSPECT RELATED WIRING & CHECK FOR TSBs

Turn the ignition off.

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the PTC No. 2
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.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro