Astra L4-1.8L (2009)
‹› If less than the specified value, test the serial data circuits for a short to ground.
5. Ignition ON, test for less than 4.5 volts between the following serial data circuits of the DLC and ground.
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Terminal 3
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Terminal 11
‹› If greater than the specified range, test the serial data circuit for a short to voltage.
6. Ignition OFF, test for infinite resistance between the DLC serial data circuit terminal 3 and terminal 11.
‹› If less than the specified value, test for a short between the serial data circuits.
7. Connect the X1 harness connector at the infotainment display.
8. Ignition OFF, disconnect the X1 harness connector of the radio.
9. Ignition ON, attempt to communicate with the display unit. Communication should not be available.
‹› If communication is established, replace the radio.
10. Ignition OFF, disconnect the X1 harness connector of the infotainment display.
11. Ignition OFF, test for infinite resistance between the following serial data circuits and ground.
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Terminal 19
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Terminal 20
‹› If less than the specified value, test the serial data circuit for a short to ground.
12. Ignition ON, test for less than 1-volt between the following serial data circuits and ground.
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Terminal 19
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Terminal 20
‹› If greater than the specified range, test the serial data circuit for a short to voltage.
13. Ignition OFF, test for infinite resistance between the serial data circuit terminal 19 and terminal 20.
‹› If less than the specified value, test for a short between the serial data circuits.
14. If the circuits test normal, replace the infotainment display.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests
and Procedures) after completing the repair.
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GMLAN Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
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Control Module References (See: Testing and Inspection/Programming and Relearning) for control module replacement, setup, and programming
Scan Tool Does Not Communicate with Low Speed GMLAN Device
Scan Tool Does Not Communicate with Low Speed GMLAN Device
Diagnostic Instructions
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Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
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Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
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Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure Instructions)
provides an overview of each diagnostic category.
Diagnostic Fault Information
