Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC2006G6 GTP, 2D COUPE, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1141 (DATA COMMUNICATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DOES NOT COMMUNICATE WITH HIGH SPEED GMLAN DEVICECIRCUIT/SYSTEM TESTING
2006 Pontiac G6 GTP, 2D Coupe, Standard
Circuit/System Testing
2006 Pontiac G6 GTP, 2D Coupe, StandardSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
- Test for less than 1 ohm between the ground circuit terminal 5 of the DLC and ground.
- If greater than the specified range, test the ground circuit for open/high resistance.
- Ignition OFF, disconnect the X2 harness connector at the BCM.
- Test for less than 2 ohms on the serial data circuit between terminal 6 of the DLC and terminal 1 of the BCM.
- If greater than the specified range, test the serial data circuit for open/high resistance.
- Ignition OFF, disconnect the X1 and X4 harness connector at the BCM.
- Verify a test lamp illuminates between each ground circuit terminal of the BCM listed below and B+.
- X1 terminal 9
- X1 terminal 12
- X2 terminal 13
- X4 terminal E12
- If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
- Ignition ON, verify a test lamp illuminates between the B+ circuit terminal D12 of the BCM and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
- Ignition ON, test for less than 1 volt between the serial data circuit terminal 6 of the DLC and ground, and terminal 14 of the DLC and ground.
- If greater than the specified range, test the serial data circuit for a short to voltage.
- Test for infinite resistance between the serial data circuit terminal 6 of the DLC and ground, and terminal 14 of the DLC and ground.
- If less than the specified value, test the serial data circuit for a short to ground.
- Test for infinite resistance between the serial data circuits terminal 6 and terminal 14 of the DLC.
- If less than the specified value, test the serial data circuits for a short between them.
- Connect the X1, X2, X3, and X4 harness connectors at the BCM.
- Disconnect the appropriate harness connector at the ECM.
- RPO LZ4/LE5 - X1
- RPO LY7 - X3
- RPO HP7 - X3
- Attempt to communicate with the vehicle control interface module (VCIM). Communication should not be available.
- If communication is available, replace the ECM.
- Ignition OFF, disconnect the harness connector at the SGCM (RPO - HP7).
- Attempt to communicate with the VCIM. Communication should not be available.
- If communication is available, test the following serial data circuits for a short between the circuits, short to voltage, or a short to ground between the SGCM and the ECM. If the circuits test normal, replace the SGCM.
- Terminal 11
- Terminal 23
- If communication is available, test the following serial data circuits for a short between the circuits, short to voltage, or a short to ground between the SGCM and the ECM. If the circuits test normal, replace the SGCM.
- Ignition OFF, disconnect the harness connector at the TCM.
- Attempt to communicate with the VCIM. Communication should not be available.
- If communication is available, test the following serial data circuits for a short between the circuits, short to voltage, or a short to ground between the TCM and the SGCM. If the circuits test normal, replace the TCM.
- RPO MH2 - Terminal 12
- RPO MH2 - Terminal 5
- RPO MH2 - Terminal 5 and 12
- RPO MN5 - Terminal 37
- RPO MN5 - Terminal 38
- RPO MN5 - Terminal 37 and 38
- If communication is available, test the following serial data circuits for a short between the circuits, short to voltage, or a short to ground between the TCM and the SGCM. If the circuits test normal, replace the TCM.
- Ignition OFF, disconnect the harness connector at the EBCM.
- Attempt to communicate with the VCIM. Communication should not be available.
- If communication is available, test the following serial data circuits for a short between the circuits, short to voltage, or a short to ground between the EBCM and the TCM. If the circuits test normal, replace the EBCM.
- Terminal B12
- Terminal B9
- If communication is available, test the following serial data circuits for a short between the circuits, short to voltage, or a short to ground between the EBCM and the TCM. If the circuits test normal, replace the EBCM.
- Ignition OFF, disconnect the X2 harness connector at the power steering control module.
- Attempt to communicate with the VCIM. Communication should not be available.
- If communication is available, test the following serial data circuits for a short between the circuits, short to voltage, or a short to ground between the suspension control module and the terminator resistor. If the circuits test normal, replace the power steering control module.
- Terminal 1
- Terminal 2
- If communication is available, test the following serial data circuits for a short between the circuits, short to voltage, or a short to ground between the suspension control module and the terminator resistor. If the circuits test normal, replace the power steering control module.
- Ignition OFF, disconnect the X3 harness connector at the VCIM. Attempt to communicate with the BCM. Communication should not be available.
- If communication is available, test the following serial data circuits for a short between the circuits, short to voltage, or a short to ground between the VCIM and the suspension control module. If the circuits test normal, replace the VCIM.
- Terminal 9
- Terminal 8
- If communication is available, test the following serial data circuits for a short between the circuits, short to voltage, or a short to ground between the VCIM and the suspension control module. If the circuits test normal, replace the VCIM.
- Ignition OFF, disconnect the X2 harness connector at the BCM.
- Ignition ON, test for less than 1 volt between the following serial data circuits of BCM and ground.
- Terminal 20
- Terminal 2
- If greater than the specified range, test the circuit for a short to voltage.
- Test for infinite resistance between the following serial data circuits of BCM and ground.
- Terminal 20
- Terminal 2
- If less than the specified value, test the circuit for a short to ground.
- Test for infinite resistance between the serial data circuits terminal 20 terminal 2 of the BCM.
- If less than the specified value, test the serial data circuits for a short between them.
- If the circuits test normal, replace the BCM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.