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Inflation and Deflation of the Air Suspension System WARNING: Do not remove an air spring under any circumstances when there is pressure in the air spring. Do not remove any components supporting an air spring without either exhausting the air or providing support for the air spring to prevent vehicle damage or personal injury. WARNING: Disconnecting an air line that is connected to the air compressor can cause personal injury or damage to components as high pressure air is vented uncontrolled. 1. Turn the air suspension switch on. 2. Turn the ignition switch to the RUN position. 3. Connect NGS Tester to the data link connector (DLC). 4. Select Air Suspension Control Module under Active Command Mode: ? VENT FRNT to deflate the front down. ? LIFT FRNT to inflate the front up. ? VENT REAR to deflate the rear down. ? LIFT REAR to inflate the rear up. Calibration Front Ride Height Resetting — Clear B2140 DTC 1. Turn the ignition key OFF and turn it back to RUN; exit the vehicle, close all doors and allow the system to vent the vehicle down to kneel height (approximately 30 seconds). 2. Connect New Generation STAR (NGS) Tester to the data link connector (DLC). 3. Select the proper vehicle year, model and engine type. 4. Select 4WAS-AIR SUSP/EVO (4×2 and 4×4) module. 5. Select “Parameter Reset Command (Clear Ride Height) under Active Command Modes” menu, trigger through the warning messages and reset (trigger from OFF to ON): ? NGS version 10.0 — “Front” and “Rear.” ? NGS version 11.0+ — “Front CLR.” 6. Back out the torsion bar adjustment bolt (approximately 40 mm from the bolt head to the bottom surface of the torsion bar adjuster). 7. Deflate the front air shocks by using the NGS “Vent Front” command in “Air Suspension Control” menu (should take about 30 seconds), and jounce the front of the vehicle to fully lower the front of the vehicle. 8. Adjust and measure the vehicle ride height; refer to Section 204-01B. 9. NOTE: Do not save rear ride heights. The air suspension control module has precalibrated values already stored. Refer to Rear Ride Height Mechanical Resetting. Select the “Save Calibration Values (Store Ride Height)” NGS command to calibrate the air suspension control module. Trigger through the warning message(s) and save “FRONT” (trigger from OFF to ON).

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Customer Concern: Tests/Procedures: Potential Causes: Tech Tips: Code C0660 will reset. 1. Check the RTD fuse located in the underhood fuse block. 2. Check for Battery Voltage (B+) on the Orange wire at the automatic level control air compressor pin F. 3. If less than B+ at pin F, check for a wiring and connection problem between the air compressor and the underhood fuse block. 4. Disconnect the compressor leveling module connector and check the resistance from the positive battery voltage circuit of the exhaust solenoid valve and the control circuit of the exhaust solenoid valve. Should be 30-90 ohms. 5. Check for B+ on the Dark Blue wire pin B at the air compressor with the exhaust solenoid commanded off. 6. Check for B+ at the Electronic Suspension Control module connector C2 pin B5 Dark Blue wire with the exhaust solenoid commanded off. 7. If there is B+ at the air compressor but not at the electronic suspension control, check for a wiring and connection problem between the air compressor and the electronic suspension control module. Air Suspension Compressor Vent Solenoid Electronic Suspension Control Ground Power Wiring Conditions for Setting the DTC C0660 • An open in the control circuit of the exhaust solenoid valve • A short to ground in the control circuit of the exhaust solenoid valve • A short to battery in the control circuit of the exhaust solenoid valve • An open in the battery positive voltage circuit of the exhaust solenoid valve • An open RTD fuse • A malfunctioning exhaust solenoid valve

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Legend (1) Auto Level Control (ALC) Harness (2) Auto Level Control (ALC) Sensor Legend (1) Auto Level Control (ALC) Inflator Solenoid Valve (2) Inflator Air Switch (3) Body Harness (4) Rear Electric Accessory Plug Housing (5) Auto Level Control (ALC) Inflator Relay (6) Auto Level Control Harness Behind Rear Left Wheelhouse Legend (1) Pass Through P403 (2) In-line connector C407 (3) Auto Level Control Harness (4) Auto Level Control (ALC) Sensor Connector (5) Auto Level Control (ALC) Air Compressor (6) Auto Level Control (ALC) Compressor Relay (7) Auto Level Control (ALC) Connector Below Vehicle, Rear Of LR Wheelhouse

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DUAL ACTION SYSTEM The suspension system incorporates a rear load leveling system that maintains the vehicle at the proper ride height under varying conditions of vehicle load, and an optional road calibrated suspension ride control system that varies the damping of the shock absorbers between soft and firm. The rear load leveling system uses air springs to support the vehicle weight. The quantity of air in the rear air spring is controlled by the vehicle dynamic module (VDM) to maintain a predetermined vehicle ride height. Each air spring has an air spring solenoid to control air flow into and out of each air spring. The optional ride control system uses four shocks with electronically controlled actuators. The shock actuators are internally mounted on the lower bodies of the front spring and shock assemblies and the rear shocks. The action of the shock actuators is controlled by the VDM. The VDM sends a signal to an appropriate shock actuator which switches to either soft or firm damping. Normally the shock actuator setting is in a soft, luxury car mode. This is done by causing an electric current flow through the actuator, which induces electromagnetic force that moves the shock actuator from a firm to a soft position. When driving situations require, the setting is switched to a firm, high performance control mode. This is done by removing power to the actuator, allowing the shock actuator to return to the firm mode.

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Heater blower speed resistor Inertia fuel shut off switch Inertia fuel shut off switch – Diesel Interior lamp delay relay Outside air temperature sensor Seat adjustment relay, driver’s side Seat adjustment relay, passenger’s side Steering position sensor Sunroof motor Suspension adjustment valve block, rear Suspension control module Suspension G-force sensor Suspension ride height sensor, front Suspension ride height sensor, rear Vehicle speed sensor Air conditioning air temperature control module (-1994MY) Air conditioning condenser blower motor control module Air conditioning control module Air conditioning control module (1995MY-) Air conditioning refrigerant pressure switch Airbag control module (in steering wheel) Alarm system control module Central locking control module Central locking signal control module Coded keypad Compact disc interface Cruise control actuator valve Cruise control module Cruise control vacuum pump Diagnostic link Door mirror adjustment control module Electric windows control module, right front Engine control module relay 1 Engine control module relay 2 Engine coolant blower motor relay 1