Pinpoint Test L : The DSP (Audio Digital Signal Processing Module) Does Not Respond To The Scan Tool

WARNING: This page is about a different car, the 2018 Ford Focus. 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.

L1 CHECK THE DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect: DSP C4326C .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4326C-5	Courtesy of FORD MOTOR COMPANY	Ground
C4326C-6	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes

GO to L2

No	VERIFY the RJB fuse 10 (25A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION (EXCEPT ELECTRIC) to identify the possible causes of the circuit short.

L2 CHECK THE DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) GROUND CIRCUITS FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4326C-13	Courtesy of FORD MOTOR COMPANY	Ground
C4326C-14	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances less than 3 ohms?

Yes

GO to L3

No	REPAIR the circuit in question.

L3 CHECK THE I-CAN (INFOTAINMENT COMMUNICATION NETWORK) CIRCUITS BETWEEN THE DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) AND THE IPC (INSTRUMENT PANEL CLUSTER) FOR AN OPEN

Disconnect: IPC.

Disconnect: DSP C4326A .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4326A-1	Courtesy of FORD MOTOR COMPANY	C220-5
C4326A-11	Courtesy of FORD MOTOR COMPANY	C220-4

Are the resistances less than 3 ohms?

Yes

GO to L4

No	REPAIR the circuit in question.

L4 CHECK FOR CORRECT DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all the DSP connectors and related in-line connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect the DSP 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 Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new DSP. REFER to: Audio Digital Signal Processing (DSP) Module .

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.