Solstice L4-2.4L (2007)
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the low speed splice pack.
2. Ignition ON, test for less than 1.0 volt between the low speed GMLAN serial data circuit of the DLC and ground.
‹› If greater than 1.0 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 1.0 ohm of resistance in the serial data circuit between the DLC and the splice pack.
‹› If greater than 1.0 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 after completing the repair. See: Testing and Inspection/Diagnostic Trouble Code Tests and Associated
Procedures/Verification Tests and Procedures
* Control Module References for module replacement, setup, and programming See: Testing and Inspection/Programming and Relearning
* GMLAN Wiring Repairs
Scan Tool Does Not Power Up
Scan Tool Does Not Power Up
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Testing and Inspection/Initial Inspection and
Diagnostic Overview/Diagnostic Starting Point - Vehicle
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Circuit/System Description
The data link connector (DLC) is a standardized 16-cavity connector. Design and location is dictated by an industry-wide standard. The following is
required to be provided:
* Scan tool power battery positive voltage at terminal 16
* Scan tool power ground at terminal 4
* Common signal ground at terminal 5
