Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Possible Causes
FUSED B(+) CIRCUITS OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUITS OPEN
GROUND CIRCUITS OPEN
DIAGNOSTIC CAN C CIRCUITS OPEN
DIAGNOSTIC CAN C CIRCUITS SHORTED TO GROUND
DIAGNOSTIC CAN C CIRCUITS SHORTED TOGETHER
TOTALLY INTEGRATED POWER MODULE (TIPM)

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
  NOTE:
  Make sure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
  
  NOTE:
  Make sure the scan tool is updated to the latest software.
  
  NOTE:
  If the scan tool displays any error messages involving the Diagnostic CAN C circuits, diagnose and repair the error message before proceeding.
2. With the scan tool, attempt to communicate with the TIPM.
  Does the scan tool communicate with the TIPM?
  
  Yes
  - The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
  No
  - Go To 2.
FUSED B(+) CIRCUITS OPEN AT TIPM
1. Disconnect the scan tool from the DLC.
2. Using a 12-volt test light connected to ground, and using the wiring diagram as a guide, check all Fused B(+) circuits at the TIPM.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go To 3.
  No
  - Repair the open or short in the Fused B(+) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
FUSED IGNITION SWITCH OUTPUT CIRCUITS OPEN AT TIPM
1. Turn the ignition on.
2. Using a 12-volt test light connected to ground, and using the wiring diagram as a guide, check each Fused Ignition Switch Output circuit at the TIPM.
  Does the test light illuminate brightly for each circuit?
  
  Yes
  - Go To 4.
  No
  - Repair the open in the Fused Ignition Switch Output circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
GROUND CIRCUITS OPEN AT TIPM
1. Turn the ignition off.
2. Using a 12-volt test light connected to 12-volts, and using the wiring diagram as a guide, check all ground circuits at the TIPM.
  Does the test light illuminate brightly on each circuit?
  
  Yes
  - Go To 5.
  No
  - Repair the open in the ground circuit that did not light the test light.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (D72) DIAGNOSTIC CAN C (+) CIRCUIT FOR AN OPEN

Fig 1: Measuring Resistance Of Diagnostic CAN C (+) Circuit Between The TIPM Harness Connector And DLC
Courtesy of CHRYSLER LLC
1. Disconnect the TIPM C7 harness connector.
2. Measure the resistance of the (D72) Diagnostic CAN C (+) circuit between the TIPM C7 harness connector and the DLC.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 6.
  No
  - Repair the open in the (D72) Diagnostic CAN C (+) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (D71) DIAGNOSTIC CAN C (-) CIRCUIT FOR AN OPEN

Fig 2: Checking Diagnostic Can C (-) Circuit For Open
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (D71) Diagnostic CAN C (-) circuit between the TIPM C7 harness connector and the DLC.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 7.
  No
  - Repair the open in the (D71) Diagnostic CAN C (-) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE DIAGNOSTIC CAN C CIRCUITS FOR A SHORT TOGETHER

Fig 3: Checking Diagnostic CAN C (+) Circuit For Short To Diagnostic CAN C (-) Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (D72) Diagnostic CAN C (+) circuit and the (D71) Diagnostic CAN C (-) circuit at the TIPM C7 harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Replace the Totally Integrated Power Module in accordance with the Service Information. Refer to MODULE, Totally Integrated Power (TIPM) , Removal .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Repair the short between the (D72) Diagnostic CAN C (+) circuit and the (D71) Diagnostic CAN C (-) circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .