Riding Height Adjustment
NOTE:
Perform Auto Test procedure before checking alignment or riding height. See AUTO TEST under TESTING.
- Place vehicle on alignment rack or other hoist that supports vehicle on tires. Install NGS tester or equivalent to diagnostic connector (located in engine compartment near right/front strut tower), and perform Auto Test. See AUTO TEST under TESTING for additional information. Vehicle must pass Auto Test at least twice in succession before beginning this procedure. Codes 11, 29 and/or 45 are accepted as passed.
- Turn ignition on. Inspect ride height sensor brackets. Replace bent or damaged parts. Install battery charger to keep battery charged during testing. Turn air suspension off. To determine Dimension "A", measure vertically from bottom edge of wheelwell lip to bottom of rim. See Fig 1. See RIDE HEIGHT SPECIFICATIONS table.RIDE HEIGHT SPECIFICATIONS
Application Preferred Range Front 24 1/4" 24 1/4" To 24 3/4" Rear 24 1/4" 24" To 24 1/2" - If vehicle is not at proper trim height, use scan tool to perform Function Test to pump or vent appropriate air spring(s) until suspension is at correct ride height. See PUMP & VENT COMMANDS table for command codes. For further information, see FUNCTION TEST under TESTING & DIAGNOSIS.PUMP & VENT COMMANDS
Air Spring Pump Code Vent Code Left/Front 212 213 Right/Front 214 215 Left/Rear 216 217 Right/Rear 218 219 - Re-measure ride height on all 4 corners of vehicle. When all corners are at correct ride height, enter air suspension height sensor trim detection function on scan tool. Using scan tool, enter 223 to access Left/Front, 224 for Right/Front, and 225 for Left/Rear height sensor detection.
- Adjust only one sensor at a time. To adjust front sensors, loosen lower sensor bracket bolts. See Fig 2. To adjust rear sensor loosen upper sensor bracket bolts. Slide sensor slowly up or down until a steady tone indicates sensor is at correct length. Tighten sensor bracket while keeping sensor at correct length.
- Re-measure ride height on all 4 corners of vehicle. When all corners are at correct ride height, Rerun Auto Test to verify service is complete.