Pinpoint Test Y : The Audio DSP Module Does Not Respond To The Scan Tool
WARNING: This page is about a different car, the 2018 Lincoln MKT. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery, Mounting and Cables
.
- Y1 CHECK THE AUDIO DSP MODULE VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: Audio DSP Module C4326C .
- Ignition ON.
- Measure the voltage
between:
Positive Lead Negative Lead Pin Circuit Pin Circuit C4326C-9 SBP05 (GY/RD) - Ground C4326C-10 SBP05 (GY/RD) - Ground C4326C-11 SBP19 (BU/RD) - Ground C4326C-12 SBP19 (BU/RD) - Ground
Are the voltages greater than 11 volts?
Yes GO to Y2. No VERIFY the Body Control Module (BCM) fuse 5 (20A) and fuse 19 (20A) are OK. If OK, REPAIR the circuit in question. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short. - Y2 CHECK THE AUDIO DSP MODULE GROUND CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance
between:
Positive Lead Negative Lead Pin Circuit Pin Circuit C4326C-21 GD351 (BK/GN) - Ground C4326C-22 GD351 (BK/GN) - Ground C4326C-23 GD351 (BK/GN) - Ground
Are the resistances less than 3 ohms?
Yes GO to Y3. No REPAIR the circuit in question. - Y3 CHECK THE I-CAN CIRCUITS BETWEEN THE AUDIO DSP MODULE AND THE DLC FOR AN OPEN
- Disconnect: Audio DSP Module C4326A .
- Measure the resistance
between:
Positive Lead Negative Lead Pin Circuit Pin Circuit C4326A-11 VDB13 (BU) C251-1 VDB13 (BU/GY) C4326A-1 VDB14 (VT) C251-9 VDB14 (VT/GY)
Are the resistances less than 3 ohms?
Yes GO to Y4. No REPAIR the circuit in question. - Y4 CHECK FOR CORRECT AUDIO DSP MODULE OPERATION
- Disconnect all the audio DSP module connectors.
- Repair:
- corrosion (replace connector or terminals - clean module pins)
- damaged or bent pins - replace terminals/pins
- pushed-out pins - replace pins as necessary
- Connect all the audio DSP module connectors and make sure they seat correctly.
- Operate the system and verify 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 audio DSP module. REFER to Information and Entertainment Systems Touchscreen (Touchscreen Display) or Information and Entertainment Systems THX (THX Audio System). No The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.