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

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Q1 CHECK THE DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect: DSP C4452C .

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4452C-9	Courtesy of FORD MOTOR COMPANY	Ground
C4452C-10	Courtesy of FORD MOTOR COMPANY	Ground
C4452C-11	Courtesy of FORD MOTOR COMPANY	Ground
C4452C-12	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes

GO to Q2

No	VERIFY the BCM fuse 5 (20A) or fuse 28 (20A) is OK. If OK, REPAIR the circuit. If not OK, REFER to OEM Electrical Wiring Diagram Introduction to identify the possible causes of the circuit short.

Q2 CHECK THE DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4452C-21	Courtesy of FORD MOTOR COMPANY	Ground
C4452C-22	Courtesy of FORD MOTOR COMPANY	Ground
C4452C-23	Courtesy of FORD MOTOR COMPANY	Ground
C4452C-24	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances less than 3 ohms?

Yes

GO to Q3

No	REPAIR the circuit.

Q3 CHECK THE HS-CAN3 (HIGH SPEED-CONTROLLER AREA NETWORK 3) CIRCUITS BETWEEN THE DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) AND THE GWM (GATEWAY MODULE A) FOR AN OPEN

Disconnect: DSP C4452A .

Disconnect: GWM C2431 .

Measure:

Positive Lead	Measurement / Action	Negative Lead
C4452A-11	Courtesy of FORD MOTOR COMPANY	C2431-16
C4452A-1	Courtesy of FORD MOTOR COMPANY	C2431-15

Are the resistances less than 3 ohms?

Yes

GO to Q4

No	REPAIR the circuit in question.

Q4 CHECK FOR CORRECT DSP (AUDIO DIGITAL SIGNAL PROCESSING MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the DSP connector 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 connector 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.