Dodge Nitro. Manual - part 723

With the ignition switch on. 

Set Condition: 

The A/C Heater Control has detected the system voltage is low. 

Diagnostic Test 

1) VERIFY THE DTC IS ACTIVE 

Turn the ignition switch on. 

With a scan tool, read and record DTCs. 

With the scan tool, clear DTCs. 

Turn the ignition switch off, and then on. 

Using the scan tool, read DTCs. 

Does the scan tool display this DTC as active?  

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) (F943) FUSED RUN-START RELAY OUTPUT CIRCUIT OPEN

Possible Causes 

(F943) FUSED RUN-START RELAY OUTPUT CIRCUIT OPEN
A/C HEATER CONTROL

NOTE:

Diagnose any related Powertrain DTCs before continuing.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

  

Fig. 57: Using 12 Volt Test Light Connected To Ground To Probe (F943) Fused Run-Start Relay 
Output Circuit In A/C Heater Control C1 Harness Connector 
Courtesy of CHRYSLER LLC 

Turn the ignition off. 

Disconnect the A/C Heater Control C1 harness connector. 

Turn the ignition on. 

Using a 12 volt test light connected to ground, probe the (F943) Fused Run-Start Relay Output circuit in 
the A/C Heater Control C1 harness connector. 

Does the test light illuminate brightly?  

Yes  

Go to 3).  

No  

Repair the (F943) Fused Run-Start Relay Output circuit for an open.  

Perform BODY VERIFICATION TEST - VER 1 .  

3) CHECK THE A/C HEATER CONTROL 

NOTE:

Check the related fuses to the Fused Ignition Switch Output (Run-Start) 
circuit. If the fuse is found to be open repair the circuit for a shorted 
condition.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

  

Turn the ignition off. 

Reconnect the A/C Heater Control C1 harness connector. 

While back probing, measure the voltage of the (F943) Fused Run-Start Relay Output circuit in the A/C 
Heater Control C1 harness connector. 

Start the engine. 

Using the scan tool, view battery voltage under Data Display in the Engine category. 

Compare the voltage on the scan tool to the voltage reading on the voltmeter. 

Is the voltage on the scan tool equal to the voltmeter reading within +/- 0.5 volt?  

Yes  

Replace the A/C Heater Control in accordance with the service information.  

Perform BODY VERIFICATION TEST - VER 1 .  

No  

Repair the circuit(s) that indicated the incorrect voltage.  

Perform SKREEM/SKIM VERIFICATION TEST .  

B210B-SYSTEM VOLTAGE HIGH 

NOTE:

A dirty (partial) ground can cause abnormal conditions within a system. 
Make sure the module has a good ground before continuing. 

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

  

Fig. 58: Fused Run-Start Relay Output Circuit Schematic 
Courtesy of CHRYSLER LLC 

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article. 

When Monitored: 

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro