LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 2007 >> Liberty Limited, RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> (Audio System & Video System - Electrical Diagnostics) >> Audio/Video >> DTC Troubleshooting >> Remote Radio Switches Inoperative If Equipped >> Diagnostic Test

Diagnostic Test

  1. 1) ATTEMPT TO COMMUNICATE WITH THE RADIO 

    Turn the ignition on.

    With the Scan Tool, attempt to communicate with the Radio.

    Was the Scan Tool able to communicate with the Radio? 

    Yes 

    1. Go to step  2).

    No 

    1. Refer to the communication category and perform the appropriate symptom.
    2. Perform BODY VERIFICATION TEST .
  2. 2) CHECK OPERATION OF SWITCHES 

    Turn the ignition on.

    Turn the Radio on.

    Operate all the remote radio switch functions.

    Is only one function or one switch not operating properly? 

    Yes 

    1. Repair the Radio Control MUX circuit or the Radio Control MUX Return circuit for an open between the inoperative switch and the clockspring. If OK, replace the remote radio switch.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Go to step  3).
  3. 3) CHECK THE REMOTE RADIO CONTROL SWITCH VOLTAGE 

    Turn the ignition on.

    With the Scan Tool, enter Body Computer then Sensors and monitor the Radio Control SW voltage.

    Is the voltage above 3.8 volts? 

    Yes 

    1. Go to step  4).

    No 

    1. Go to step  8).
  4. 4) CLOCKSPRING OPEN 

    Turn the ignition on.

    Turn the Radio on.

    Disconnect the Clockspring C1 harness connector.

    Connect a jumper wire between the Radio Control MUX circuit and the Radio Control MUX Return circuit.

    Did the radio change stations? 

    Yes 

    1. Repair the Radio Control MUX circuit or the Radio Control MUX Return circuit for an open between the clockspring and the splice to the switches. If OK, replace the Clockspring.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Go to step  5).
  5. 5) OPEN RADIO CONTROL MUX RETURN CIRCUIT 

    Turn the ignition off.

    Disconnect the Clockspring C1 harness connector.

    Disconnect the BCM C2 harness connector.

    Measure the resistance of the Radio Control MUX Return circuit between the BCM C2 connector and the Clockspring C1 connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to step  6).

    No 

    1. Repair the Radio Control MUX Return circuit for an open between the clockspring and the BCM.
    2. Perform BODY VERIFICATION TEST .
  6. 6) OPEN RADIO CONTROL MUX CIRCUIT 

    Turn the ignition off.

    Disconnect the Clockspring C1 harness connector.

    Disconnect the BCM C2 harness connector.

    Measure the resistance of the Radio Control MUX circuit between the BCM C2 connector and the Clockspring C1 connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to step  7).

    No 

    1. Repair the Radio Control MUX circuit for an open between the clockspring and the BCM.
    2. Perform BODY VERIFICATION TEST .
  7. 7) BODY CONTROL MODULE - OPEN INTERNALLY 

    If there are no possible causes remaining, view repair. 

    Repair 

    1. Replace the Body Control Module in accordance with the service information.
    2. Perform BODY VERIFICATION TEST .
  8. 8) LEFT REMOTE RADIO SWITCH SHORTED TO GROUND 
    WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait 2 minutes before proceeding.
    CAUTION: Do not place an intact undeployed airbag module face down on a hard surface, the airbag module will propel into the air if accidently deployed.

    Remove the Driver Airbag Module.

    Disconnect the Left Remote Radio Switch harness connector.

    Turn the ignition on, reconnect the battery.

    With the Scan Tool, enter Body Computer then Sensors and monitor the Radio Control SW voltage.

    Is the voltage above 3.8 volts? 

    Yes 

    1. Replace the Left Remote Radio Switch.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Go to step  9).
  9. 9) RIGHT REMOTE RADIO SWITCH SHORTED TO GROUND 
    WARNING: To avoid personal injury or death, turn the ignition off, disconnect the battery and wait 2 minutes before proceeding.
    CAUTION: Do not place an intact undeployed airbag module face down on a hard surface, the airbag module will propel into the air if accidently deployed.

    Remove the Driver Airbag Module.

    Disconnect the Right Remote Radio Switch harness connector.

    Turn the ignition on, reconnect the battery.

    With the Scan Tool, enter Body Computer then Sensors and monitor the Radio Control SW voltage.

    Is the voltage above 3.8 volts? 

    Yes 

    1. Replace the Right Remote Radio Switch.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Go to step  10).
  10. 10) CHECK THE CLOCKSPRING 

    Turn the ignition off.

    Disconnect the Clockspring C3 harness connector.

    Turn the ignition on.

    With the Scan Tool, enter Body Computer then Sensors and monitor the Radio Control SW voltage.

    Is the voltage above 3.8 volts? 

    Yes 

    1. Go to step  11).

    No 

    1. Go to step  12).
  11. 11) RADIO CONTROL MUX CIRCUIT SHORTED TO GROUND AT THE SWITCH 

    Turn the ignition off.

    Disconnect the Clockspring C3 harness connector.

    NOTE: Ensure both remote radio switches are disconnected.

    Measure the resistance between ground and the Radio Control MUX circuit at the clockspring C3 harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the Radio Control MUX circuit for a short to ground between the clockspring and the remote radio switches.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Repair the Radio Control MUX circuit for a short to the Radio Control MUX Return circuit between the clockspring and the remote radio switches.
    2. Perform BODY VERIFICATION TEST .
  12. 12) CLOCKSPRING SHORTED TO GROUND 

    Turn the ignition off.

    Disconnect the Clockspring C1 harness connector.

    Turn the ignition on.

    With the Scan Tool, enter Body Computer then Sensors and monitor the Radio Control SW voltage.

    Is the voltage above 3.8 volts? 

    Yes 

    1. Replace the Clockspring in accordance with the service information.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Go to step  13).
  13. 13) RADIO CONTROL MUX CIRCUIT SHORTED TO GROUND 

    Turn the ignition off.

    Disconnect the Clockspring C1 harness connector.

    Disconnect the BCM C2 harness connector.

    Measure the resistance between ground and the Radio Control MUX circuit.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the Radio Control MUX circuit for a short to ground between the clockspring and the BCM.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Go to step  14).
  14. 14) RADIO CONTROL MUX CKT SHORTED TO THE RADIO CONTROL MUX RETURN CKT 

    Turn the ignition off.

    Disconnect the Clockspring C1 harness connector.

    Disconnect the BCM C2 harness connector.

    Measure the resistance between the Radio Control MUX circuit and the Radio Control MUX Return circuit.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the Radio Control MUX circuit for a short to the Radio Control MUX Return circuit between the clockspring and the BCM.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Replace the Body Control Module in accordance with the service information.
    2. Perform BODY VERIFICATION TEST .
scientia non olet · About LEMON Manuals