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
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