Pinpoint Test M: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Module Communications Network for schematic and connector information.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Audio System/Navigation for schematic and connector information.

Normal Operation 

The satellite digital audio receiver system (SDARS) module communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the SDARS module. The SDARS module shares the MS-CAN with the instrument cluster (IC), the accessory protocol interface module (APIM), the smart junction box (SJB), the HVAC module (if equipped), the audio control module (ACM), the audio digital signal processing (DSP) module (if equipped), the rear entertainment module (RETM) (if equipped) (if equipped), the driver seat module (DSM) (if equipped), the parking aid module (PAM) (if equipped), the liftgate/trunk module (LTM) (if equipped) and the dual climate control seat module (DCSM) (if equipped). Voltage for the SDARS module is provided by circuit CBP13 (GY/BN). Circuit GD148 (BK/YE) provides ground.

This pinpoint test is intended to diagnose the following:

• Fuse
• Wiring, terminals or connectors
• SDARS module

PINPOINT TEST M: THE SATELLITE DIGITAL AUDIO RECEIVER SYSTEM (SDARS) MODULE DOES NOT RESPOND TO THE SCAN TOOL 

1. M1 CHECK THE SDARS MODULE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN 
   • Key in OFF position.
   • Disconnect: SDARS Module C4344
   • Key in ON position.
   Fig 1: Measuring Voltage
   Courtesy of FORD MOTOR CO.
   • Measure the voltage between the SDARS module C4344-9, circuit CBP13 (GY/BN), harness side and ground.
   • Is the voltage greater than 10 volts? 
   1. YES  : Go to  M2.
   2. NO  : VERIFY the SJB fuse 13 (5A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. M2 CHECK THE SDARS MODULE GROUND CIRCUIT FOR AN OPEN 
   • Key in OFF position.
   Fig 2: Measuring Resistance
   Courtesy of FORD MOTOR CO.
   • Measure the resistance between the SDARS module C4344-3, circuit GD148 (BK/YE), harness side and ground.
   • Is the resistance less than 5 ohms? 
   1. YES  : Go to  M3.
   2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. M3 CHECK THE MS-CAN CIRCUITS BETWEEN THE SDARS MODULE AND THE DATA LINK CONNECTOR (DLC) FOR AN OPEN 
   Fig 3: Checking MS-CAN Circuit For Open
   Courtesy of FORD MOTOR CO.
   • Measure the resistance between the SDARS module C4344-1, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side.
   Fig 4: Checking MS-CAN Circuit For Open
   Courtesy of FORD MOTOR CO.
   • Measure the resistance between the SDARS module C4344-7, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side.
   • Are the resistances less than 5 ohms? 
   1. YES  : Go to  M4.
   2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. M4 CHECK FOR CORRECT SDARS MODULE OPERATION 
   • Disconnect the SDARS module connector.
   • Check for:
     • corrosion
     • damaged pins
     • pushed-out pins
   • Connect the SDARS module connector and make sure it seats correctly.
   • Operate the system and verify the concern is still present.
   • Is the concern still present? 
   1. YES  : INSTALL a new SDARS module. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS article. CLEAR the DTCs. REPEAT the network test with the scan tool.
   2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.