Pinpoint Test Av : A Loud Popping Sound Is Heard From The Speakers When Cycling The Ignition
WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
- AV1 CHECK THE START SENSE CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: ACM C240A .
- Disconnect: PCM C175B .
- Measure:
Positive Lead Measurement / Action Negative Lead C240A-3 Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to AV2. No REPAIR the circuit. - AV2 CHECK THE START SENSE CIRCUIT FOR AN OPEN
Is the resistance less than 3 ohms?
Yes GO to AV3. No REPAIR the circuit. - AV3 CHECK FOR CORRECT ACM OPERATION
- Ignition OFF.
- Disconnect and inspect all the ACM connectors and related in-line connectors.
- Repair:
- Corrosion (clean module pins or install new connectors or terminals)
- Damaged or bent pins (install new terminals or pins)
- Pushed-out pins (install new pins as necessary)
- Reconnect the ACM connectors and related in-line connectors. Make sure they seat and latch correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new ACM. REFER to Audio Control Module (ACM) . 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.