Navigator Powertrain Diagnostic Overview
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Is the voltage greater than 10 volts?
Yes
GO to N2.
No
VERIFY the Smart Junction Box (SJB) fuse 3 (15A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the
possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool. See: Diagrams/Electrical Diagrams/Diagrams By
Number
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N2 CHECK THE AUDIO RCU MODULE GROUND CIRCUIT FOR AN OPEN
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Ignition OFF.
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Disconnect: Negative Battery Cable.
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Measure the resistance between the audio RCU module C3077-1, circuit GD114 (BK/BU), harness side and ground.
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Is the resistance less than 5 ohms?
Yes
GO to N3.
No
REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
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N3 CHECK THE MS-CAN CIRCUITS BETWEEN THE AUDIO RCU MODULE AND THE DLC FOR AN OPEN
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Measure the resistance between the audio RCU module C3077-8, circuit VDB06 (GY/OG), harness side and the Data Link Connector (DLC)
C251-3, circuit VDB06 (GY/OG), harness side.