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.
Data Display
The scan tool's input display function can be helpful in determining if the ESC module is receiving the correct input status. This can assist in determining if the ESC system is actually commanding a shock absorber. For example, the ESC system requires the input status from the ride control switch in order to determine the ride settings. A starting point might be to select the ride control switch data display function from the scan tool menu. The input status should change when the switch is manually operated. If no change occurred, then the problem is current and the input could be stuck. A shorted, open or malfunctioning switch or related wiring might cause the input to be stuck. If the change did occur, the problem is intermittent. In order to diagnose this condition using a scan tool, select the scan tool's input function. Then, watch the ride control switch input while moving the suspected wiring/connector. Try to duplicate the malfunction conditions. This scan tool feature allows checks that could not be performed while driving the vehicle.
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Turn the Ignition ON, Engine OFF//Vehicle Trim Height within Specifications | |||
| Battery Voltage | Data Display | Volts | B+ |
| Chassis Pitch Input Change | Data Display | Change/No Change | Varies |
| Chassis Pitch Input Status | Data Display | Active/Inactive | Varies |
| DSP Software Version ID | ID Information | Version Number | Varies |
| EEPROM Calibration ID | ID Information | Calibration Number | Varies |
| GM Part Number | ID Information | Part Number | Varies |
| GMSCM Software Version | ID Information | Version Number | Varies |
| Left Front Position Sensor | Data Display | 0-5 Volts | 0.35-4.75 Volts |
| Left Front Shock Level | Data Display | 0-100% | 0-90% |
| Left Rear Position Sensor | Data Display | 0-5 Volts | 0.35-4.75 Volts |
| Left Rear Shock Level | Data Display | 0-100% | 0-90% |
| Right Front Position Sensor | Data Display | 0-5 Volts | 0.35-4.75 Volts |
| Right Front Shock Level | Data Display | 0-100% | 0-90% |
| Right Rear Position Sensor | Data Display | 0-5 Volts | 0.35-4.75 Volts |
| Right Rear Shock Level | Data Display | 0-100% | 0-90% |
| Suspension Control Select Switch | Data Display | 0-5 Volts | 0.5-4.5 Volts |
| Steering Position PWM | Data Display | 0-10 ms | Varies |
| Vehicle Speed | Data Display | km/h (mph) | Varies |
NO RELATED
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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.