Pinpoint Test M: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool
Communications Network
Pinpoint Tests
Pinpoint Test M: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool
Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number
Refer to Wiring Diagram Set 130, Audio System/Navigation for schematic and connector information. Diagrams By Number
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 Smart Junction Box (SJB), the Accessory Protocol Interface Module (APIM), the Audio Control Module (ACM), the HVAC module, the Driver Seat Module (DSM), the Rear Entertainment Module (RETM), the Liftgate/Trunk Module (LTM) and the IC. Voltage for the SDARS module is provided by circuit SBP03 (BU/RD). Ground is provided by circuit GD103 (BK/BU).
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- SDARS module
PINPOINT TEST M: THE SDARS MODULE DOES NOT RESPOND TO THE SCAN TOOL
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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M1 CHECK THE SDARS MODULE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: SDARS module C4344.
- Measure the voltage between the SDARS module C4344-9, circuit SBP03 (BU/RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to M2.
No
VERIFY the SJB fuse 3 (15A) is OK. If OK, REPAIR the circuit in question. If not OK, Refer to the Wiring Diagrams to identify the possible causes of the short circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
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M2 CHECK THE SDARS MODULE GROUND CIRCUIT FOR AN OPEN
- Measure the resistance between the SDARS module C4344-3, circuit GD103 (BK/BU), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to M3.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
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M3 CHECK THE MS-CAN CIRCUITS BETWEEN THE SDARS MODULE AND THE DATA LINK CONNECTOR (DLC) FOR AN OPEN
- 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.
- 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?
Yes
GO to M4.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
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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?
Yes
INSTALL a new SDARS module. CLEAR the DTCs. REPEAT the network test with the scan tool.
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.
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