Solstice L4-2.0L Turbo (2008)
Scan Tool References
Control Module References (See: Testing and Inspection/Programming and Relearning)for Scan Tool Information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the low speed GMLAN splice pack.
2. Ignition ON, test for less than 1 volt between the low speed GMLAN serial data circuit of the DLC and ground.
‹› If greater than 1 volt, repair the serial data circuit for a short to voltage.
3. Test for infinite resistance between the serial data circuit of the DLC and ground.
‹› If less than infinite resistance, repair the serial data circuit for a short to ground.
4. Test for less than 5 ohm of resistance in the serial data circuit between the DLC and the splice pack.
‹› If greater than 5 ohm, repair the serial data circuit for an open/high resistance.
5. Install a 3-amp fused jumper wire between pin A and pin C of the splice pack. Install another 3-amp fused jumper wire to pin C and leave the other
end of it free to use as a probe.
6. Remove the harness connectors containing the GMLAN low speed buss from the DRR and the VCIM.
7. Using the extra jumper wire from pin C attempt to establish communications with any other module connected to the splice pack. At least one
module should be able to communicate.
‹› If communications can not be established with any module, test the serial data circuit of the BCM for a short to voltage, short to ground or
open/high resistance. If the serial data circuit test normal test the BCM B+ and ground circuits for there respective potentials. If all of the
aforementioned circuits are analyzed functional then replace the BCM.
8. Using the extra jumper wire at pin C, continue testing each serial data circuit at the splice pack for communications. All modules should be able to
communicate.
‹› If there is only one module connected, test the serial data circuit for a short to voltage or a short to ground. If the circuit tests normal, replace
the faulty module.
‹› If there are multiple modules, test each serial data circuit for a short to voltage or a short to ground, with the modules disconnected. If the
circuit tests normal, install each module one at a time starting with the closest module to the splice pack until communications stop. Replace
the faulty module.
9. If all circuits test normal, test or replace the splice pack.
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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Control Module References (See: Testing and Inspection/Programming and Relearning)for module replacement, setup, and programming
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GMLAN Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics)
Scan Tool Does Not Power Up
Scan Tool Does Not Power Up
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.
Circuit/System Description
