Dodge Nitro. Manual — part 725

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article.

When Monitored:

Continuously

Set Condition:

If the CAN Interior Bus (+) or CAN Interior Bus (-) circuit is open, shorted to voltage, or shorted to
ground.

Diagnostic Test

1) VERIFY THE DTC IS ACTIVE

Turn the ignition on.

With the scan tool, read HVAC DTCs.

Does the scan tool display this DTC as active?

Yes

Go to 2).

No

If the DTC is stored, 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.

Perform BODY VERIFICATION TEST - VER 1 .

2) CHECK FOR ACTIVE CAN BUS RELATED DTCS IN THE TOTALLY INTEGRATE
POWER MODULE (TIPM)

With the scan tool, read the Totally Integrated Power Module (TIPM) DTCs

Does the scan tool display any active CAN BUS related DTCs?

Yes

Possible Causes

ACTIVE CAN BUS DTC IN THE TOTALLY INTEGRATED POWER CONTROL MODULE
(D265) CAN C INTERIOR BUS (125K) (+) CIRCUIT OPEN
(D264) CAN C INTERIOR BUS (125K) (-) CIRCUIT OPEN
A/C HEATER CONTROL

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

Diagnose and repair the DTC(s).

Perform BODY VERIFICATION TEST - VER 1 .

No

Go to 3).

3) CHECK (D265) CAN INTERIOR BUS (+) CIRCUIT FOR AN OPEN

Turn the ignition off.

Disconnect the negative battery cable.

Disconnect the A/C Heater Control C1 harness connector.

Disconnect the Totally Integrated Power Module (TIPM) C7 harness connector.

Measure the resistance of the (D265) CAN Interior Bus (+) circuit between the Totally Integrated Power
Module (TIPM) C7 harness connector and the A/C Heater Control C1 harness connector.

Is the resistance below 2.0 ohms?

Yes

Go to 4).

No

Repair the (D265) CAN Interior Bus (+) circuit for an open.

Perform BODY VERIFICATION TEST - VER 1 .

4) CHECK (D264) CAN INTERIOR BUS (-) CIRCUIT FOR AN OPEN

Measure the resistance of the (D264) CAN Interior Bus (-) circuit between the Totally Integrated Power
Module (TIPM) C7 connector and the A/C Heater Control C1 harness connector.

Is the resistance below 2.0 ohms?

Yes

Go to 5).

No

Repair the (D264) CAN Interior Bus (-) circuit for an open.

Perform BODY VERIFICATION TEST - VER 1 .

5) CHECK (D265) CAN C INTERIOR BUS (+) CIRCUIT FOR A SHORT TO GROUND

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

Measure the resistance between ground and the (D265) CAN C Interior Bus (125K) (+) circuit in the A/C
Heater Control C1 harness connector.

Is the resistance above 1000.0 ohms?

Yes

Go to 6).

No

Repair the (D265) CAN C Interior Bus (+) circuit for a short to ground.

Perform BODY VERIFICATION TEST - VER 1 .

6) CHECK (D264) CAN C INTERIOR BUS (-) CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between ground and the (D264) CAN C Interior Bus (125K) (-) circuit in the A/C
Heater Control C1 harness connector.

Is the resistance above 1000.0 ohms?

Yes

Go to 7).

No

Repair the (D264) CAN C Interior Bus (-) circuit for a short to ground.

Perform BODY VERIFICATION TEST - VER 1 .

7) CHECK (D265) CAN C INTERIOR BUS (+) CIRCUIT FOR A SHORT TO VOLTAGE

Turn the ignition on.

Measure the voltage of the (D265) CAN C Interior Bus (125K) (+) circuit in the A/C Heater Control C1
harness connector.

Is the voltage below 0.2 volts?

Yes

Go to 8).

No

Repair the (D265) CAN C Interior Bus (+) circuit for a short to voltage.

Perform BODY VERIFICATION TEST - VER 1 .

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro

8) CHECK (D264) CAN C INTERIOR BUS (-) CIRCUIT FOR A SHORT TO VOLTAGE

Measure the voltage of the (D264) CAN C Interior Bus (125K) (-) circuit in the A/C Heater Control C1
harness connector.

Is the voltage below 0.2 volts?

Yes

Replace the A/C Heater Control in accordance with the Service Information.

Perform BODY VERIFICATION TEST - VER 1 .

No

Repair the (D264) CAN C Interior Bus (-) circuit for a short to voltage.

Perform BODY VERIFICATION TEST - VER 1 .

U0141-LOST COMM W/INTEGRATED POWER MODULE/FRONT CONTROL MODULE/TIPM

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 Totally Integrated Power Module (TIPM).

Refer to DIAGNOSIS AND TESTING for the diagnostic test procedure.

U0151-LOST COMMUNICATION WITH OCCUPANT RESTRAINT CONTROLLER (ORC)

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 Occupant Restraint Controller (ORC).

Refer to DIAGNOSIS AND TESTING for the diagnostic test procedure.

U0154-LOST COMMUNICATION WITH OCCUPANT CLASSIFICATION MODULE

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Electrical Diagnostics - Nitro