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

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Refer to Module Communications Network for schematic and connector information.
Normal Operation and Fault Conditions

The DSP communicates on the HS-CAN3.

Possible Sources
- Fuse
- Wiring, terminals and connector
- DSP
Visual Inspection and Pre-checks
- Verify BCM fuse 23 (30A) is OK.

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

Ignition OFF.

Disconnect: DSP C2385C (9 speaker) or C2364C (12 Speaker)

Ignition ON.

Measure:

9 Speaker

Positive Lead	Measurement / Action	Negative Lead
C4385C-14	Courtesy of FORD MOTOR COMPANY	Ground

12 Speaker

Positive Lead	Measurement / Action	Negative Lead
C2364C-8	Courtesy of FORD MOTOR COMPANY	Ground
C2364C-16	Courtesy of FORD MOTOR COMPANY	Ground

Are the voltages greater than 11 volts?

Yes

GO to L2

No	VERIFY BCM fuse 23 (30A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Introduction to identify the possible causes of the circuit short.

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

Ignition OFF.

Measure:

9 Speaker

Positive Lead	Measurement / Action	Negative Lead
C2385C-11	Courtesy of FORD MOTOR COMPANY	Ground

12 Speaker

Positive Lead	Measurement / Action	Negative Lead
C2364C-5	Courtesy of FORD MOTOR COMPANY	Ground
C2364C-13	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 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: GWM C2431.

Measure:

9 Speaker

Positive Lead	Measurement / Action	Negative Lead
C2385C-15	Courtesy of FORD MOTOR COMPANY	C2431-16
C2385C-16	Courtesy of FORD MOTOR COMPANY	C2431-15

12 Speaker

Positive Lead	Measurement / Action	Negative Lead
C2364A-1	Courtesy of FORD MOTOR COMPANY	C2431-16
C2364A-11	Courtesy of FORD MOTOR COMPANY	C2431-15

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 the DSP 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. 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 service articles: TSB, GSB, SSM or FSA If a service article exists for this concern, DISCONTINUE this test and FOLLOW service article instructions. If no service articles 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.