Pinpoint Test

CHECK THE AUDIO SIGNAL TO THE Left Hand (LH) QUARTER PANEL SPEAKER
1. Ignition OFF.
2. Disconnect: Left Hand (LH) Quarter Panel Speaker.
3. Operate the audio system in radio tuner (Amplitude Modulation/Frequency Modulation (AM/FM)) mode.
4. Measure:
  
  Fig 1: Checking Audio Signal To Left Hand (LH) Quarter Panel Speaker
  Courtesy of FORD MOTOR CO.
  - Is a fluctuating Alternating Current (AC) voltage present?
  1. Yes: INSTALL a new Left Rear (LR) door speaker. REFER to SPEAKER - DOOR .
  2. No: GO to 2 on page 2.
CHECK THE AUDIO CIRCUITS TO THE Left Hand (LH) QUARTER PANEL SPEAKER FOR A SHORT TO VOLTAGE
1. Ignition OFF.
2. Disconnect: Audio Control Module (ACM) C240A.
3. Disconnect: Left Rear (LR) Door Speaker.
4. Ignition ON.
5. Measure:
  
  Fig 2: Checking Audio Circuits To Left Hand (LH) Quarter Panel Speaker For Short To Voltage
  Courtesy of FORD MOTOR CO.
  - Is any voltage present?
  1. Yes: REPAIR the circuit in question.
  2. No: GO to 3 on page 3.
CHECK THE AUDIO CIRCUITS TO THE Left Hand (LH) QUARTER PANEL SPEAKER FOR A SHORT TO GROUND
1. Ignition OFF.
2. Measure:
  
  Fig 3: Checking Audio Circuits To Left Hand (LH) Quarter Panel Speaker For Short To Ground
  Courtesy of FORD MOTOR CO.
  - Are the resistances greater than 10,000 ohms?
  1. Yes: GO to 4 on page 4.
  2. No: REPAIR the circuit in question.
CHECK THE AUDIO CIRCUITS TO THE Left Hand (LH) QUARTER PANEL SPEAKER FOR AN OPEN
1. Measure:
  
  Fig 4: Checking Audio Circuits To Left Hand (LH) Quarter Panel Speaker For Open
  Courtesy of FORD MOTOR CO.
  - Are the resistances less than 3 ohms?
  1. Yes: GO to 5 on page 5.
  2. No: REPAIR the circuit in question.
CHECK FOR CORRECT Audio Control Module (ACM) OPERATION
1. Disconnect and inspect all Audio Control Module (ACM) connectors.
2. Repair:
  - corrosion (install new connector or terminals - clean module pins)
  - damaged pins - install new terminals/pins
  - pushed-out pins - install new pins as necessary
3. Reconnect the Audio Control Module (ACM) connectors. Make sure they seat and latch correctly.
4. Operate the system and determine if the concern is still present.
  - Is the concern still present?
  1. Yes: CHECK On-Line Automotive Service Information System (OASIS) for any applicable Technical Service Bulletins (TSBs). If a Technical Service Bulletin (TSB) exists for this concern, DISCONTINUE this test and FOLLOW Technical Service Bulletin (TSB) instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new Audio Control Module (ACM). REFER to AUDIO CONTROL MODULE (ACM) .
  2. No: The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.