Pinpoint Test J: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool, Or No Medium Spe
Communications Network
Pinpoint Test
Pinpoint Test J: The Satellite Digital Audio Receiver System (SDARS) Module Does Not Respond To The Scan Tool, or No Medium Speed Controller Area Network (MS-CAN) Communication
Refer to wiring Diagram Set 14, Module Communications Network for schematic and connector information.
Refer to wiring Diagram Set 25, Electronic Engine Controls 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). The SDARS module shares the MS-CAN with the audio unit (ACM). While the SDARS module communicates with the scan tool on the MS-CAN, the audio unit (ACM) does not. All audio unit (ACM) diagnostics are carried out through the audio bezel test, refer to Accessories and Optional Equipment.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Audio unit (ACM)
- SDARS module
PINPOINT TEST J: THE SDARS MODULE DOES NOT RESPOND TO THE SCAN TOOL OR NO MS-CAN COMMUNICATION
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the Pinpoint Test.
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J1 CHECK THE DLC PINS FOR DAMAGE
- Ignition OFF.
- Disconnect the scan tool from the Data Link Connector (DLC).
- Inspect DLC pins 3 and 11 for damage.
- Are DLC pins 3 and 11 OK?
Yes
GO to J2.
No
REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
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J2 CHECK THE MS-CAN TERMINATION RESISTANCE
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Disconnect the scan tool cable from the DLC.
- Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side.
- Is the resistance between 54 and 66 ohms?
Yes
GO to J5.
No
GO to J3.
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J3 CHECK THE MS-CAN TERMINATION RESISTOR
- Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side.
- Is the resistance between 108 and 132 ohms?
Yes
GO to J9.
No
GO to J4.
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J4 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER
- Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to J10.
No
GO to J9.
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J5 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground.
- Are the resistances greater than 5,000 ohms?
Yes
GO to J6.
No
GO to J12.
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J6 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE
- Connect the vehicle battery.
- Ignition ON.
- Measure the voltage between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground.
- Are the voltages greater than 6 volts?
Yes
REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
GO to J7.
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J7 CHECK THE SDARS MODULE VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: SDARS Module C2358.
- Ignition ON.
- Measure the voltage between the SDARS module C2358-9, circuit SBP12 (GN/RD), harness side and ground.
- Are the voltages greater than 10 volts?
Yes
GO to J8.
No
VERIFY the Smart Junction Box (SJB) fuse 12 (15A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the Wiring Diagrams Manual to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
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J8 CHECK THE SDARS MODULE GROUND CIRCUITS FOR AN OPEN
- Ignition OFF.
- Measure the resistance between the SDARS module C2358-3, circuit GD103 (BK/BU), harness side and ground.
- Are the resistances less than 5 ohms?
Yes
GO to J14.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
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J9 CHECK THE CAN CIRCUITS BETWEEN THE DLC AND THE SDARS MODULE FOR AN OPEN
- Measure the resistance between the SDARS module C2358-1, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side.
- Measure the resistance between the SDARS module C2358-7, 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
CONNECT the negative battery cable. GO to J15.
No
REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
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J10 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE SDARS MODULE DISCONNECTED
- Disconnect: SDARS Module C175b.
- Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to J11.
No
CONNECT the negative battery cable. GO to J15.
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J11 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE AUDIO UNIT (ACM) DISCONNECTED
- Disconnect: Audio Unit (ACM) C290c.
- Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side.
- Is the resistance less than 5 ohms?
Yes
REPAIR the circuit. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
CONNECT the negative battery cable. GO to J16.
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J12 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE SDARS MODULE DISCONNECTED
- Disconnect: SDARS Module C2358.
- Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground.
- Are the resistances greater than 5,000 ohms?
Yes
CONNECT the negative battery cable. GO to J15.
No
GO to J13.
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J13 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE AUDIO UNIT (ACM) DISCONNECTED
- Disconnect: Audio Unit (ACM) C290c.
- Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground.
- Are the resistances greater than 5,000 ohms?
Yes
CONNECT the negative battery cable. GO to J16.
No
REPAIR the circuit. CONNECT all modules. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
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J14 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE AUDIO UNIT (ACM) DISCONNECTED
- Disconnect: Audio Unit (ACM) C290c.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
- Is CAN communication restored to the SDARS MODULE?
Yes
CONNECT the audio unit (ACM). CONNECT the negative battery cable. GO to J16.
No
CONNECT the audio unit (ACM). CONNECT the negative battery cable. GO to J15.
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J15 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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J16 CHECK FOR CORRECT AUDIO UNIT (ACM) OPERATION
- Disconnect all the audio unit (ACM) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the audio unit (ACM) connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new audio unit (ACM). 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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