Pinpoint Test H: The Audio Unit Does Not Respond To The Diagnostic Tool: Testing
WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
- H1 CHECK THE AUDIO UNIT C240C FOR DAMAGE
- Key in OFF position.
- Disconnect: Audio Unit C240c.
- Is the audio unit C240c OK?
- Yes : GO to H2.
- No : REPAIR the audio unit C240c as necessary. CARRY OUT the PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST .
- H2 CHECK MEDIUM SPEED CONTROLLER AREA NETWORK (CAN) CIRCUITS 2180 (WH/BK) AND 2181 (BK/YE) BETWEEN THE DATA LINK CONNECTOR (DLC) C251 AND THE AUDIO UNIT C240C FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the audio unit C240c-15, circuit 2180 (WH/BK), harness side and the DLC 3251-3, circuit 2180 (WH/BK), harness side; and between the audio unit C240c-16, circuit 2181 (BK/YE), harness side and the DLC C251-11, circuit 2181 (BK/YE), harness side.
- Are the resistances less than 5 ohms?
- Yes : GO to H3.
- No : REPAIR the circuit in question. CLEAR the diagnostic trouble codes (DTCs). REPEAT the self-test. CARRY OUT the PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST .
- H3 CHECK FOR CORRECT AUDIO UNIT OPERATION
- Disconnect all the audio unit connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the audio unit connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new audio unit. REFER to AUDIO UNIT . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST .
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST .