Diagnostic Test

CHECK FOR AN INTERMITTENT CONDITION
NOTE:
Use a known good USB device to perform the following tests.
1. Using the scan tool, record and erase the radio DTCs.
2. Cycle the ignition switch from on to off, wait five seconds and then back to on.
3. Connect a known good USB device into the USB port.
4. Using the scan tool, read the active radio DTCs.
  Does the scan tool display active: B1570-USB COMMUNICATION PERFORMANCE?
  
  Yes
  - Go To 2
  No
  - Test complete.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
CHECK THE CONNECTORS AND HARNESS
1. Turn the ignition off.
2. Disconnect the USB harness connector at the back of the radio.
3. Inspect the connectors and harness between the USB port and the radio.
  Are there any issues with the harness or connectors?
  
  Yes
  - Repair or replace as needed.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .
  No
  - Replace the radio in accordance with the Service Information. Refer to RADIO, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE - BODY VERIFICATION TEST .