Diagnostic Test

CHECK FOR AN INTERMITTENT CONDITION
1. Turn the ignition on.
2. Using the scan tool, record and erase the Radio DTCs.
3. Turn the Radio on.
4. Adjust the speakers to the front and center.
5. Using the scan tool, read the active Radio DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Test complete, 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.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
DETERMINE THE VEHICLE CONFIGURATION
1. Review the vehicle sales codes to determine the vehicle audio system configuration.
  Is the vehicle equipped with sales code RFV - DISASSOCIATED TOUCHSCREEN DISPLAY?
  
  Yes
  - Go To 4
  No
  - Go To 3
VERIFY OPERATION OF THE BUTTON
1. With the scan tool, read DTCs and record on repair order.
2. With the scan tool, erase DTCs.
3. Press and release all the Radio hard and soft keys three times.
4. Wait 60 seconds.
5. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Radio in accordance with the Service Information. Refer to RADIO, REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Test complete.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE INTEGRATED CENTER STACK (ICS)
1. With the scan tool, read the ICS DTCs.
  NOTE:
  The ICS is capable of setting a similar type DTC for B157F-2A-BUTTON/KNOB - STUCK
  
  Does the ICS have DTCs?
  
  Yes
  - Refer to the appropriate service information.
  No
  - Go To 5
CHECK THE ICS BUTTONS
1. Carefully check the ICS buttons by pressing and releasing each button for the following:
  - Debris (Dirt, Foreign Objects, Sticky Substances, etc.) that may be causing the button(s) to remain in a pressed state.
  - Physical damage to the buttons.
  Do the buttons show any of the above noted?
  
  Yes
  - Replace the ICS in accordance with the Service Information. Refer to MODULE, INTEGRATED CENTER STACK (ICSM), REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 6
CHECK THE RADIO BUSSED INPUTS
1. Do not press any buttons in or on the vehicle during this portion.
2. With the scan tool, check the Radio data tab for each bussed input value / status for the following:
  - Pressed or Not Pressed (ICS)
  Does the scan tool show a "Pressed" bussed input value / status in the Radio data?
  
  Yes
  - Go To 7
  No
  - Replace the Radio in accordance with the Service Information. Refer to RADIO, REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE ASSOCIATED ECUS FOR POSSIBLE CAUSE
1. Turn the ignition off.
2. Remove the ICS from communicating on the CAN bus.
  NOTE:
  An ECU will stop communicating on a CAN bus by removing its power(s), ground(s), or disconnecting the ECU.
  
  NOTE:
  Communication DTCs (i.e. Loss of Com, Implausible, Invalid) will appear for those ECUs that are removed from communicating on the CAN bus.
3. Turn the ignition on
4. With the scan tool, check the Radio data tab for each bussed input value / status for the following:
  - Pressed or Not Pressed
  Did the Radio change the "Pressed" bussed input value / status in the Radio data to "Not Pressed"?
  
  Yes
  - Replace the ICS in accordance with the Service Information. Refer to MODULE, INTEGRATED CENTER STACK (ICSM), REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Radio in accordance with the Service Information. Refer to RADIO, REMOVAL AND INSTALLATION .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .