PINPOINT TEST M : The Audio DSP Module Does Not Respond To The Diagnostic Scan Tool

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. 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 .

M1 CHECK THE AUDIO DSP MODULE VOLTAGE SUPPLY CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect: Audio DSP Module C4326C (Sony ®) or C2364C (THX ®).

Ignition ON.

Measure:

Sony ® audio DSP module

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

THX ® audio DSP module

Positive Lead	Measurement / Action	Negative Lead
C2364C-9	Courtesy of FORD MOTOR COMPANY	Ground
C2364C-10	Courtesy of FORD MOTOR COMPANY	Ground
C2364C-11	Courtesy of FORD MOTOR COMPANY	Ground
C2364C-12	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes	GO to M2.
No	VERIFY the BCM fuse 5 (20A) or BCM fuse 19 (15A) (THX ® only) is 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.

M2 CHECK THE AUDIO DSP MODULE GROUND CIRCUITS FOR AN OPEN

Ignition OFF.

Disconnect: Negative Battery Cable.

Measure:

Sony ® audio DSP module

Positive Lead	Measurement / Action	Negative Lead
C4326C-15	Courtesy of FORD MOTOR COMPANY	Ground
C4326C-16	Courtesy of FORD MOTOR COMPANY	Ground

THX ® audio DSP module

Positive Lead	Measurement / Action	Negative Lead
C2364C-21	Courtesy of FORD MOTOR COMPANY	Ground
C2364C-22	Courtesy of FORD MOTOR COMPANY	Ground
C2364C-23	Courtesy of FORD MOTOR COMPANY	Ground
C2364C-24	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances less than 3 ohms?

Yes	GO to M3.
No	REPAIR the circuit in question.

M3 CHECK THE I-CAN CIRCUITS BETWEEN THE AUDIO DSP MODULE AND THE IPC FOR AN OPEN

Disconnect: Audio DSP module C4326A (Sony ®) or C2364A (THX ®)

Disconnect: IPC C220 .

Measure:

Sony ® audio DSP module

Positive Lead	Measurement / Action	Negative Lead
C4326A-1	Courtesy of FORD MOTOR COMPANY	C220-25
C4326A-11	Courtesy of FORD MOTOR COMPANY	C220-26

THX ® audio DSP module

Positive Lead	Measurement / Action	Negative Lead
C2364A-11	Courtesy of FORD MOTOR COMPANY	C220-25
C2364A-1	Courtesy of FORD MOTOR COMPANY	C220-26

Are the resistances less than 3 ohms?

Yes	CONNECT the negative battery cable. GO to M4.
No	REPAIR the circuit in question.

M4 CHECK FOR CORRECT AUDIO DSP MODULE OPERATION

Ignition OFF.

Disconnect and inspect the audio DSP module connectors and related in-line connectors.

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

Reconnect the audio DSP module connectors and related in-line connectors. Make sure they seat and latch 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 - Sony Audio System (Sony ®) or REFER to Information and Entertainment Systems - THX Audio System (THX ®)
No	The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.