Dodge Nitro. Manual - part 727

If the A/C Heater Control loses communication with the Left Rear Door Module (LRDM).

Refer to DIAGNOSIS AND TESTING for the diagnostic test procedure. 

U0202-LOST COMMUNICATION WITH RIGHT REAR DOOR MODULE 

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article. 

When Monitored: 

With the ignition on. 

Set Condition: 

If the A/C Heater Control loses communication with the Right Rear Door Module (LRDM). 

Refer to DIAGNOSIS AND TESTING for the diagnostic test procedure. 

U0203-LOST COMMUNICATION WITH DOOR MODULE FRONT LEFT 

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article. 

When Monitored: 

With the ignition on. 

Set Condition: 

If the A/C Heater Control loses communication with the Left Front Door Module (LRDM). 

Refer to DIAGNOSIS AND TESTING for the diagnostic test procedure. 

U0203-LOST COMMUNICATION WITH DOOR MODULE FRONT RIGHT 

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article. 

When Monitored: 

With the ignition on. 

Set Condition: 

If the A/C Heater Control loses communication with the Right Front Door Module (LRDM). 

Refer to DIAGNOSIS AND TESTING for the diagnostic test procedure. 

U0209-LOST COMMUNICATION WITH MEMORY SEAT CONTROL MODULE 

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

  

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article.

When Monitored: 

With the ignition on. 

Set Condition: 

If the A/C Heater Control looses communication with the Memory Seat Module (MSM). 

Refer to DIAGNOSIS AND TESTING for the diagnostic test procedure. 

*HVAC SYSTEM TEST 

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article. 

Diagnostic Test 

1) HVAC SYSTEM TEST 

Start the engine. 

With the scan tool, erase HVAC DTCs. 

Choose a diagnostic test to perform  

Complete HVAC System Test  

Go to step 2).  

A/C System Performance Test  

Go to step 2).  

Mode Switch, Door Actuator CKT, & Auxiliary Coolant Pump CKT Test  

Go to step 3).  

NOTE:

The HVAC System Test consists of four tests. Test 2 tests A/C system 
performance, Test 3 tests for mode switch, door actuator circuit, and 
auxiliary coolant pump circuit faults, Test 4 tests for shorted door actuator 
circuits, and Test 5 tests for door actuator calibration faults. Either 
perform all four tests for a complete system test or perform an individual 
test if diagnosing a specific symptom.

NOTE:

Active DTCs must be resolved before diagnosing stored DTCs.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

  

Actuator DTC Detection Test  

Go to step 4).  

Actuator Calibration Test  

Go to step 5).  

2) A/C SYSTEM PERFORMANCE TEST 

Set the mode to the Panel position. 

Verify that the front blower motor operates correctly in all speeds. Diagnose and repair all blower related 
faults before proceeding with this test. 

Set the front blower speed to high. 

With the scan tool in HVAC, select System Tests and then select Cooldown test. Allow the test to run to 
completion.  

Does the scan tool display a status message that indicates a fault has occurred?  

Yes, Conditions Too Cold - Test Not Run  

If running, turn the A/C compressor off. Verify that the work area ambient temperature is above 
15.6°C (60°F). If not, move the vehicle to a warmer work area. Verify that the evaporator 
temperature is above 18.3°C (65°F). If not, set the front blower to high speed and allow the blower 
to run for five minutes. Then, rerun the Cooldown Test.  

Yes, Blowers Not On High - Test Not Run

NOTE:

The work area ambient temperature must be above 15.6°C (60°F) and the 
evaporator temperature must be above 18.3°C (65°F) in order to test A/C 
system performance.

NOTE:

Before actuating the Cooldown Test, verify that the mode setting is not in 
a defrost position and that the A/C compressor is not running. If the 
compressor is running, turn the A/C off and allow the evaporator to warm 
up before proceeding with the test.

NOTE:

Running the Cooldown test will cause the A/C status indicator to flash.

NOTE:

One or more status messages will display on the scan tool after running 
the Cooldown Test. These messages will clear after paging back out of 
this test function. Therefore, it is important to note all messages before 
doing so.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

  

Set the front blower speed to high speed and then rerun the Cooldown Test.  

Yes, No Results Stored/Test Not Complete  

Verify that power is not interrupted while rerunning the Cooldown Test.  

No  

Perform BODY VERIFICATION TEST - VER 1 .  

3) MODE SWITCH, DOOR ACTUATOR CIRCUIT, & AUXILIARY COOLANT PUMP 
CIRCUIT TEST 

Set the front blower speed to low. 

Set the Blend control to full cold. 

Set the Mode control to Bi-Level/Recirc. 

If equipped, set the Rear Fan switch on the Rear A/C Heater Control to off. 

If equipped, set the Rear Blend switch on the Rear A/C Heater Control to full cold. 

Monitor the scan tool for active HVAC DTCs while performing the following test steps. 

Press the A/C mode switch on, wait 30 seconds, press it off, and then proceed to the next step. 

Press the Rear Defrost mode switch on, wait 30 seconds, press it off, and then proceed to the next step. 

Press and hold the Rear Washer mode switch for several seconds, release it, and then proceed to the next 
step. 

Set the Blend control to full hot, wait 30 seconds and then set it to full cold. 

Turn the Mode control to every door position. Leave it in each position for 30 seconds. 

If equipped, set the Rear Blower control to Rear Control. 

If equipped, set the Rear Fan switch on the Rear A/C Heater Control to high speed. 

NOTE:

If at anytime a DTC becomes active during this test, proceed to the 
conclusion question.

NOTE:

If multiple DTCs become active, diagnose those that relate to a short 
circuit first.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro