Soft and Non-Uniform Ride
Soft and Non-Uniform Ride
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
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.
Reference Information
Schematic Reference
Electronic Suspension Control Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Electronic Suspension Control Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for Scan Tool Information
Circuit/System Verification
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.
Circuit/System Testing
1. Ignition OFF, disconnect the suspension control switch.
2. Test for less than 2 ohms resistance between the switch harness connector terminal 3 and ground.
• If greater than the specified value, repair the open/high resistance in the circuit.
3. Ignition ON, use a fused jumper to apply and unapply ground at the switch harness connector terminal 2 while observing the Ride Handling Sw. data parameter in the BCM Chassis data list.
• 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.
4. Test or replace the suspension control switch.
Component Testing
Suspension Control Switch
1. Place the suspension control switch in the TOUR position.
2. Test for infinite resistance between terminal 2 and terminal 3.
• If less than the specified value, replace the switch.
3. Place the suspension control switch in the SPORT position.
4. Test for less than 2 ohms resistance between terminal 2 and terminal 3.
• If greater than the specified value, replace the switch.
Suspension Position Sensor
1. Install a 3A fused jumper wire between the 5 volt reference terminal A and 5 volts. Install a jumper wire between the low reference terminal C and ground.
2. Sweep the suspension position sensor through the entire range while monitoring the voltage between the signal terminal B and the low reference terminal C. The range should vary between 0.35-4.75 volts without any spikes or dropouts.
• If not within the specified range or if it is erratic, replace the applicable suspension position sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Rear Air Suspension Control Valve Switch Replacement (Rear Air Suspension Control Valve Switch Replacement)
* Electronic Suspension Front Position Sensor Replacement (Electronic Suspension Front Position Sensor Replacement)
* Electronic Suspension Rear Position Sensor Replacement (Electronic Suspension Rear Position Sensor Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming