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Home >> Jeep >> 2022 >> Compass Altitude, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Audio (Radio) (LTM) - DTCS B1400-11 To B1562-12 >> DTC Troubleshooting >> B14DA-2A-Head Unit Button - Stuck >> Diagnostic Test

Diagnostic Test

  1. 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 appropriate SYSTEM 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 .
  2. 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
  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 

      No 

  4. 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 

      No 

      • Go To  5
  5. CHECK THE STEERING COLUMN CONTROL MODULE (SCCM) 
    1. With the scan tool, read the SCCM DTCs.
      NOTE:

      The SCCM is capable of setting a similar type DTC for B1425-2A-REMOTE RADIO SWITCH INPUT - STUCK

      Does the SCCM have DTCs?

      Yes 

      No 

      • Go To  6
  6. CHECK THE ICS AND STEERING WHEEL SWITCH BUTTONS 
    1. Carefully check the ICS and Steering Wheel Switch 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 

      No 

      • Go To  7
  7. 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:
      NOTE:

      Those bussed inputs to the Radio with a SWS designation originate from the Steering Wheel Switches on LIN bus to the SCCM. The other bussed inputs are through the Integrated Center Stack.

      • Pressed or Not Pressed (ICS)
      • Active or Not Active (SCCM)

      Does the scan tool show a "Pressed" or "Active" bussed input value / status in the Radio data?

      Yes 

      • Go To  8

      No 

      • Go To  9
  8. CHECK THE ASSOCIATED ECU 
    1. Turn the ignition off.
    2. Based on the information found in STEP 7, REMOVE THE RELATED ECU found from communicating on the CAN bus to confirm as the possible cause:
      NOTE:

      An ECU will stop communicating on a CAN bus by removing its power(s), ground(s), or disconnecting the ECU.

      • ICS - Integrated Center Stack
      • SCCM - Steering Column Control Module
      NOTE:

      Communication DTCs (i.e. Loss of Com, Implausible, Invalid) may 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:
      NOTE:

      Those bussed inputs to the Radio with a SWS designation originate from the Steering Wheel Switches on LIN bus to the SCCM. The other bussed inputs are through the Integrated Center Stack.

      • Pressed or Not Pressed (ICS)
      • Active or Not Active (SCCM)

      Did the bussed input value / status in the Radio data change to "Not Pressed" or "Not Active"?

      Yes 

      No 

  9. CHECK THE ASSOCIATED ECUS FOR POSSIBLE CAUSE 
    1. Turn the ignition off.
    2. The following ECUs listed below will need to be removed (one at a time  ) from communicating on the CAN bus to determine the ECU as the possible cause:
      NOTE:

      An ECU will stop communicating on a CAN bus by removing its power(s), ground(s), or disconnecting the ECU.

      • ICS - Integrated Center Stack
      • SCCM - Steering Column Control Module
      NOTE:

      Communication DTCs (i.e. Loss of Com, Implausible, Invalid) may 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:
      NOTE:

      Those bussed inputs to the Radio with a SWS designation originate from the Steering Wheel Switches. The other bussed inputs are through the Integrated Center Stack.

      • Pressed or Not Pressed
      • Active or Not Active (SWS related only)
    5. Repeat the above sub steps 1 - 4 of Step 9 for the remaining ECU.

      Which ECU when disconnected changed the "Pressed" or "Active" bussed input value / status in the Radio data to "Not Pressed" or "Not Active"?

      ICS 

      SCCM 

      NEITHER 

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