Dodge Nitro. Manual - part 720

Turn the ignition off. 

Check the (C7) Blower Motor Control circuit for wire chafing. 

Is any wire chafing present?  

Yes  

Repair the wire chafing on the (C7) Blower Motor Control circuit.  

Perform BODY VERIFICATION TEST - VER 1 .  

No  

Replace the Totally Integrated Power Module (TIPM) in accordance with the service information.  

Perform BODY VERIFICATION TEST - VER 1 .  

B1138-CABIN HEATER 3 CONTROL CIRCUIT LOW (TIPM) 

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article. 

When Monitored: 

With the ignition on, the Cabin Heater Relay 2 commanded on. 

Set Condition: 

If the Totally Integrated Power Module detects the (K232) Cabin Heater Relay 2 Control circuit is shorted 
to ground. 

Diagnostic Test 

1) VERIFY THAT THE DTC IS ACTIVE 

Turn the ignition on. 

With the scan tool, erase DTCs. 

With the scan tool, actuate the Cabin Heater 2 Relay. 

Monitor the scan tool, for at least two minutes.

Possible Causes 

(K232) CABIN HEATER RELAY 2 CONTROL CIRCUIT SHORTED TO GROUND
CABIN HEATER 2 RELAY
TOTALLY INTEGRATED POWER MODULE (TIPM)

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

  

With the scan tool, read DTCs. 

Does the scan tool, display active: B10B8-CABIN HEATER 2 CONTROL CIRCUIT LOW?  

Yes  

Go to 2).  

No  

The condition that caused this symptom is currently not present. 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. Repair as necessary.  

Perform BODY VERIFICATION TEST - VER 1 .  

2) CHECK (K232) CABIN HEATER RELAY 2 OUTPUT CIRCUIT FOR SHORT TO GROUND 

Turn the ignition off. 

Disconnect the TIPM C1 harness connector. 

Remove the Cabin Heater Relay 2. 

Using an ohm meter measure the resistance between the (K232) Cabin Heater Relay 2 Output circuit and 
ground. 

Does the ohm meter read open circuit?  

Yes  

Go to 3).  

No  

Repair the (K232) Cabin Heater Relay 2 Output circuit for a short to ground.  

Perform BODY VERIFICATION TEST - VER 1 .  

3) TOTALLY INTEGRATED POWER MODULE (TIPM) 

Turn the ignition on. 

With the scan tool, erase DTCs. 

With the scan tool, actuate the Cabin Heater 2 Relay. 

Monitor the scan tool for at least two minutes.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

  

With the scan tool, read DTCs. 

Does the scan tool display active: B10B8-CABIN HEATER 2 CONTROL CIRCUIT LOW?  

Yes  

Replace the Totally Integrated Power Module (TIPM) in accordance with the service information.  

Perform BODY VERIFICATION TEST - VER 1 .  

No  

Replace the Cabin Heater Relay 2 in accordance with the service information.  

Perform BODY VERIFICATION TEST - VER 1 .  

B1139-CABIN HEATER 3 CONTROL CIRCUIT HIGH (TIPM) 

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article. 

When Monitored: 

With the ignition on, the Cabin Heater Relay 2 is commanded on. 

Set Condition: 

If the Totally Integrated Power Module detects a short to voltage on the (K232) Cabin Heater Relay 2 
Control circuit. 

Diagnostic Test 

1) VERIFY THAT THE DTC IS ACTIVE 

Turn the ignition on. 

With the scan tool, erase DTCs. 

With the scan tool, actuate the Cabin Heater 2 Relay. 

Monitor the scan tool for at least two minutes. 

With the scan tool, read DTCs. 

Possible Causes 

(K232) CABIN HEATER RELAY 2 CONTROL CIRCUIT SHORTED TO VOLTAGE
CABIN HEATER RELAY 2
TOTALLY INTEGRATED POWER MODULE (TIPM)

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

  

Does the scan tool, display active: B10B9-CABIN HEATER 2 CONTROL CIRCUIT HIGH?

Yes  

Go to 2).  

No  

The condition that caused this symptom is currently not present. 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. Repair as necessary.  

Perform BODY VERIFICATION TEST - VER 1 .  

2) CHECK THE (K232) CABIN HEATER RELAY 2 CONTROL CIRCUIT FOR SHORT TO 
VOLTAGE 

Turn the ignition off. 

Disconnect the TIPM C1 harness connector. 

Remove the Cabin Heater Relay 2. 

Turn the ignition on. 

With a volt meter, measure the voltage on the (K232) Cabin Heater Relay 2 Control circuit. 

Does the volt meter read 1.0 volt or above?  

Yes  

Repair short to voltage on the (K232) Cabin Heater Relay 2 Control circuit.  

Perform BODY VERIFICATION TEST - VER 1 .  

No  

Go to 3).  

3) TOTALLY INTEGRATED POWER MODULE 

Turn the ignition on. 

With the scan tool, erase DTCs. 

With the scan tool, actuate the Cabin Heater 2 Relay. 

Monitor the scan tool for at least two minutes.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro