Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

TEST FOR INTERMITTENT CONDITION
NOTE:
Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
1. Turn the ignition on.
  NOTE:
  Make sure the battery voltage is between 10.0 and 16.0 volts.
2. With the scan tool, read the module status.
  NOTE:
  Check the BCM for any active CAN hardware DTCs, perform DTC before proceeding. Refer to the DTC INDEX article.
  
  Does the scan tool indicate that the module is active on the bus?
  
  Yes
  - The no response condition is not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 2
CHECK THE FUSED B(+) CIRCUIT FOR AN OPEN OR SHORT
1. Turn the ignition off.
2. Disconnect the EPS Assembly C1 harness connector.
3. Using a 12-volt test light connected to ground, check the Fused B(+) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3
  No
  - Repair the open or short in the Fused B(+) circuit.
  - Perform the EPS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE GROUND CIRCUIT FOR AN OPEN
1. Using a 12-volt test light connected to 12-volts, check the Ground circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the open in the Ground circuit.
  - Perform the EPS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE CAN C BUS CIRCUITS FOR AN OPEN
1. Disconnect the EPS Assembly C2 harness connector.
2. Disconnect the BCM harness connector.
3. Measure the resistance of the CAN C Bus (+) circuit between the BCM harness connector and the EPS Assembly C2 harness connector.
4. Measure the resistance of the CAN C Bus (-) circuit between the BCM harness connector and the EPS Assembly C2 harness connector.
  Are the resistances below 5.0 Ohms?
  
  Yes
  - Replace the Electronic Power Steering (EPS) Assembly in accordance with service information. Refer to COLUMN, REMOVAL .
  - Perform the EPS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the open in the CAN C Bus (+) or CAN C Bus (-) circuit.
  - Perform the EPS VERIFICATION TEST. Refer to STANDARD PROCEDURE .