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Home >> Chevrolet >> 2010 >> Cobalt LS, 4D Sedan, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 65 (Keyless/Power Door Locks/Security System) >> Symptom Troubleshooting >> The horn does not sound and/or the headlights do not flash when the PANIC button on the transmitter is pressed

The horn does not sound and/or the headlights do not flash when the PANIC button on the transmitter is pressed

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before troubleshooting, check the B-CAN DTCs. If any DTC is indicated, refer to the B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ), and troubleshoot the indicated DTC(s) first.
  1. Press the PANIC button.

    Does the horn sound? 

    YES  -Go to step 3.

    NO  -Go to step 2.

  2. Press the horn button.

    Does the horn sound? 

    YES  -Go to step 3.

    NO  -Test the horn switch and its circuit (see HORN TEST/REPLACEMENT ).

  3. Turn the headlight switch ON.

    Do the headlights come on? 

    YES  -Go to step 4.

    NO  -Check the lighting circuit.

  4. Do the transmitter test (see TRANSMITTER TEST  ).

    Is the transmitter OK? 

    YES  -Substitute a known-good immobilizer-keyless control unit, and recheck. If there is still a problem, substitute a known-good MICU, and recheck. If the problem goes away, replace the original immobilizer-keyless control unit (see IMMOBILIZER-KEYLESS CONTROL UNIT REPLACEMENT ) or MICU.

    NO  -Replace the transmitter.