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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1392 (Information System & Entertainment System) >> Diagnostic Tests >> Information and Entertainment System >> Pinpoint Tests >> Pinpoint Test F: Loud Popping Sound When Cycling The Ignition Switch >> Pinpoint Test F: Loud Popping Sound When Cycling The Ignition Switch

Pinpoint Test F: Loud Popping Sound When Cycling The Ignition Switch

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. F1 CHECK CIRCUIT CBP13 (GY/BN) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: ACM C290a or C240a
    • Disconnect: Starter Relay
    • Key in START position.
      • Fig 1: Checking Circuit For Voltage
      GF0004544Courtesy of FORD MOTOR CO.
    • Measure the voltage between the ACM C290a-15 or C240a-15, circuit CBP13 (GY/BN), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : For the Audiophile audio system, go to  F2 .

      For the THX® audio system, go to  F3 .

      For all others, INSTALL a new ACM. REFER to Audio Control Module (ACM) - Fusion, Milan  or Audio Control Module (ACM) - MKZ . TEST the system for normal operation.

    2. NO  : VERIFY the smart junction box (SJB) fuse 22 (7.5A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  2. F2 ISOLATE THE SUBWOOFER AMPLIFIER 
    • Key in OFF position.
    • Connect: ACM C290a
    • Connect: Starter Relay
    • Disconnect: Subwoofer Amplifier C466a
    • Cycle the key through all of the ignition switch positions.
    • Is a loud popping sound present? 
    1. YES  : INSTALL a new ACM. REFER to Audio Control Module (ACM) - Fusion, Milan  or Audio Control Module (ACM) - MKZ . TEST the system for normal operation.
    2. NO  : INSTALL a new subwoofer amplifier. REFER to Subwoofer Amplifier . TEST the system for normal operation.
  3. F3 ISOLATE THE DSP MODULE 
    • Key in OFF position.
    • Connect: ACM C240a
    • Connect: Starter Relay
    • Disconnect: DSP Module C4326b
    • Cycle the key through all of the ignition switch positions.
    • Is a loud popping sound present? 
    1. YES  : INSTALL a new ACM. REFER to Audio Control Module (ACM) - MKZ . TEST the system for normal operation.
    2. NO  : Go to  F4.
  4. F4 CHECK FOR CORRECT DSP MODULE OPERATION 
    • Key in OFF position.
    • Disconnect all the DSP module connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the DSP module connectors and make sure they seat correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new DSP module. REFER to Audio Digital Signal Processing (DSP) Module . REPEAT the self-test.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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