Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read RF Hub DTCs and record on the repair order.
3. Try to start the engine.
4. With the scan tool, read RF Hub DTCs and wait one minute.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - The condition or conditions that originally set this DTC are 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 and repair as necessary. If no problems are found, test complete.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (F20) IGNITION SWITCH OUTPUT CIRCUIT FOR A OPEN
1. Turn the ignition off.
2. Disconnect the Body Control Module C5 harness connector.
3. Turn the ignition on.
4. Measure the voltage between ground and the (F20) Ignition Switch Output circuit in the Body Control Module C5 harness connector.
  Is the voltage above 11.5 Volts?
  
  Yes
  - Replace the Body Control Module in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK THE (F20) IGNITION SWITCH OUTPUT CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the Radio Frequency Hub (RF Hub) C1 harness connector.
3. Check for continuity between ground and the (F20) Ignition Switch Output circuit.
  Is there continuity between ground and the (F20) Ignition Switch Output circuit?
  
  Yes
  - Repair the short to ground in the (F20) Ignition Switch Output circuit.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (F20) IGNITION SWITCH OUTPUT CIRCUIT FOR A OPEN
1. Measure the resistance of the (F20) Ignition Switch Output wire between the Body Control Module C5 harness connector and the RF Hub C1 connector.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Replace the Radio Frequency Hub (RF Hub) Module in accordance with the Service Information. Refer to MODULE, RADIO FREQUENCY (RF HUB), REMOVAL .
  - Perform the RADIO FREQUENCY HUB VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the open in the (F20) Ignition Switch Output wire.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .