PINPOINT TEST AO: DTC B1318 Or DTC U3003:16 (ACM)

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 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.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

AO1 RECHECK THE ACM DTCs
- Clear the ACM DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Repeat the ACM self-test.
- Is DTC B1318 or DTC U3003:16 still present?
- Yes : GO to AO2.
- No : The system is operating correctly at this time. The DTC may have set due to a previous low battery voltage condition.
AO2 CHECK FOR CHARGING SYSTEM DTCs IN THE PCM
- Retrieve the continuous memory DTCs from all modules.
- Is DTC P0620, P0622, P0625, P0626, or P065B set in the PCM?
- Yes : REFER to CHARGING SYSTEM .
- No : GO to AO3.
AO3 CHECK THE BATTERY CONDITION AND STATE OF CHARGE
- Check the battery condition and verify that the battery is fully charged. Refer to BATTERY, MOUNTING AND CABLES .
- Is the battery OK and fully charged?
- Yes : GO to AO4.
- No : REFER to BATTERY, MOUNTING AND CABLES .
AO4 CHECK THE ACM VOLTAGE SUPPLY
- Ignition OFF.
- Measure and record the voltage at the battery.
- Disconnect: ACM C240a.
- Ignition ON.
- Measure the voltage between the ACM C240a-1, circuit SBP39 (WH/RD), harness side and ground.
  
  Fig 1: Measuring Voltage Between ACM C240A-1 And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage within 0.2 volt of the recorded battery voltage?
- Yes : GO to AO5.
- No : REPAIR the circuit for high resistance. CLEAR the DTCs. REPEAT the self-test.
AO5 CHECK THE ACM GROUND CIRCUIT FOR CONTINUITY
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the ACM C240a-13, circuit GD114 (BK/BU), harness side and ground.
  
  Fig 2: Measuring Resistance Between ACM C240A-13 And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to AO6.
- No : REPAIR the circuit for high resistance. CLEAR the DTCs. REPEAT the self-test.
AO6 CHECK FOR CORRECT ACM OPERATION
- Disconnect all the ACM connectors.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect all the ACM connectors and make sure they seat correctly.
- Is the concern still present?
- 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.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.