• | 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 |
---|---|---|---|---|
Selective Ride Control Switch Signal Circuit | 2 | 1 | 1 | -- |
Selective Ride Control Switch Ground Circuit | -- | 1 | -- | -- |
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The electronic suspension control (ESC) module utilizes the suspension position sensor signals to control the suspension dampers . When the driver selects the SPORT position on the suspension control switch, a ground signal is sent to the body control module (BCM). The BCM then sends a serial data signal to the ESC module requesting a firmer damper ride control rate for each damper allowing the driver to customize the ride and handling of the vehicle.
Electronic Suspension Control Schematics
Electronic Suspension Control Description and Operation
Control Module References for scan tool information
Ignition ON, with the scan tool, observe each Position Sensor data parameter while jouncing the vehicle at each corner. The corresponding parameters should fluctuate with each action.
⇒ | If a parameter does not fluctuate or is erratic, test or replace the position sensor associated with that parameter. |
Ignition ON, with the scan tool, observe the Ride Handling Sw. data parameter in the BCM Chassis data list while toggling the suspension control switch between the TOURING and SPORT positions. The parameter should change state.
⇒ | If the parameter does not change state , refer to Circuit/System Testing. |
⇒ | If greater than the specified value, repair the open/high resistance. |
⇒ | If the parameter does not switch between states, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If less than the specified value, replace the switch. |
⇒ | If greater than the specified value, replace the switch. |
⇒ | If not within the specified range or if it is erratic, replace the applicable suspension position sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |