Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Voltage is supplied to the electronic suspension control (ESC) module in the battery positive voltage circuit and the ignition voltage circuit. The ESC module monitors the supplied voltage to determine if it is within a valid operating range.

Ignition ON.

The DTC is set when the battery voltage is outside the normal range of 9-15.5 volts.

The ESC module disables all ESC functionality.

Schematic Reference

Suspension Controls Schematics

Connector End View Reference

Suspension Controls Connector End Views

Description and Operation

Electronic Suspension Control Description and Operation

Electrical Information Reference

Scan Tool Reference

Ignition ON, observe the scan tool ESC Battery Voltage Signal parameter. The reading should be between 9-15.5 volts.

1. Ignition OFF, disconnect the harness connector at the ESC.
2. Test for less than 1 ohm of resistance between the ground circuit terminal 2 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. If all circuits test normal, test or replace the ESC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ESC replacement, setup, and programming.