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.
SYS.OK|MANUAL.DBβ LIVE
HOMESERVICE MANUALSBUICK2013REGAL TURBO PREMIUM, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 54 (DATA COMMUNICATIONS SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DOES NOT COMMUNICATE WITH HIGH SPEED GMLAN DEVICECIRCUIT/SYSTEM TESTINGTESTING THE SERIAL DATA CIRCUITS FOR AN OPEN/HIGH RESISTANCE
2013 Buick Regal Turbo Premium, Standard Trans
Testing the Serial Data Circuits for an Open/High Resistance
2013 Buick Regal Turbo Premium, Standard TransSECTION Testing the Serial Data Circuits for an Open/High Resistance
WARNING: This page is about a different car, the 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connectors with the high speed GMLAN serial data circuits at an easily accessible control module that is not communicating and has 2 or more pairs of serial data circuits or an internal terminating resistor.
- Ignition OFF and all vehicle systems OFF, key out of the ignition switch, all access doors closed. It may take up to 2 minutes for all vehicle systems to power down. Test for greater than 140 Ξ© between each pair of serial data circuits at the control module connector that was just disconnected. Verify that one pair of serial data circuits are greater than 140 Ξ©.
- If each pair of serial data circuits is less than the specified range, replace the control module that was disconnected.
- Connect the harness connectors at the control module that was disconnected.
- Disconnect the harness connectors with the high speed GMLAN serial data circuits at another control module which has 2 or more pairs of serial data circuits or an internal terminating resistor, in the direction of the open circuit.
- Ignition OFF and all vehicle systems OFF, key out of the ignition switch, all access doors closed. It may take up to 2 minutes for all vehicle systems to power down. Test for greater than 140 Ξ© between each pair of serial data circuits at the control module connector that was just disconnected. Verify that one pair of serial data circuits are greater than 140 Ξ©.
- If each pair of serial data circuits is less than the specified range, replace the control module that was just disconnected.
- Repeat step 3 until one of the following conditions are isolated:
- An open/high resistance on the serial data circuit between 2 control modules or splice packs, if equipped
- An open/high resistance on the serial data circuit between a control module and a terminating resistor
- An open/high resistance terminating resistor
NOTE:
A control module that has only one pair of high speed GMLAN serial data circuits and no internal terminating resistor should not be disconnected during this diagnostic test. A control module with a single pair of serial data circuits and no internal terminating resistor that has an open/high resistance would be diagnosed in the single control module not communicating diagnostic.
The serial data circuits directly between a control module and the DLC do not need to be tested.
The serial data circuits directly between a control module and the DLC do not need to be tested.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.