• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Left Front Suspension Damper Control Terminal A | C0575 02 | C0575 04 | C0575 01 | -- |
Left Front Suspension Damper Control Terminal B | -- | C0575 04 | -- | -- |
Right Front Suspension Damper Control Terminal A | C0580 02 | C0580 04 | C0580 01 | -- |
Right Front Suspension Damper Control Terminal B | -- | C0580 04 | -- | -- |
Left Rear Suspension Damper Control Terminal A | C0585 02 | C0585 04 | C0585 01 | -- |
Left Rear Suspension Damper Control Terminal B | -- | C0585 04 | -- | -- |
Right Rear Suspension Damper Control Terminal A | C0590 02 | C0590 04 | C0590 01 | -- |
Right Rear Suspension Damper Control Terminal B | -- | C0590 04 | -- | -- |
The electronic suspension control module (ESCM) commands variable levels of pulse width modulated current to each damper in response to rough road, or abrupt steering maneuver driving conditions. The ESC module continuously compares each dampers command state with the state of their feedback circuits to ensure they agree.
• | Battery voltage is between 9-16 volts. |
• | Ignition ON for 30 seconds |
• | The damper coil or the circuits to the coil are shorted to ground, shorted to voltage, or open for 3 consecutive ignition ON cycles. |
• | The vehicle must be driven over 4.8 km/h (3 mph). |
• | The driver information center (DIC) displays the SERVICE SUSPENSION SYSTEM message. |
• | If the DTC symptom 01 is stored, the ESC system is disabled. |
• | If the DTC symptom 02 or 04 is stored, the suspect damper is disabled. |
• | A current DTC will clear on the next consecutive malfunction-free ignition cycle. |
• | A history DTC will clear after 50 consecutive malfunction-free ignition cycles. |
Electronic Suspension Control Schematics
Electronic Suspension Control Description and Operation
Control Module References for scan tool information
Ignition ON, with the scan tool command the damper actuators ON and OFF while jouncing the vehicle in the front and rear. The suspension should change stiffness when commanded between the ON and OFF state.
Important: Whenever repairing and/or replacing ALC system components, perform the Suspension Position Calibration procedure.
2.1. | Connect a test lamp between the damper connector control circuit terminal A and control circuit terminal B. |
2.2. | Ignition ON, with a scan tool, clear all ESC module DTCs. |
⇒ | If the test lamp is always ON, test the control circuit terminal A for a short to voltage. If the circuit tests normal, replace the ESC module. |
⇒ | If the test lamp is always OFF, test the control circuits listed below. If all circuits test normal, replace the ESC module. |
• | Control circuit terminal A for a short to ground or open/high resistance. |
• | Control circuit terminal B for an open/high resistance or short to voltage. |
⇒ | If not within the specified range, replace the suspension damper. |
• | Control Module References for ESCM replacement, setup, and programming |