Reading and Clearing Diagnostic Trouble Codes

NOTE: Refer to Flow of diagnosis for complete procedure.

Use Rotunda New Generation Star (NGS) Tester to retrieve diagnostic trouble codes (DTCs). To retrieve DTCs:
1. Connect New Generation Star (NGS) Tester to the air suspension/steering test connector on the RH front shock absorber tower.
2. Execute Function Test 211; refer to Functional Tests procedure. Record retrieved DTCs.
3. Run Auto Test; refer to Auto Test Diagnostics procedure to determine which DTCs are currently being detected.
4. If the stored DTCs are different than current DTCs, service current DTCs first. If more than one DTC is displayed in stored or current memory, service in the following order:
1st-Electrical Faults, DTC 25, DTCs 50 through 95.
2nd-Electro-Pneumatic Faults, DTCs 98 and 99.
3rd-Courtesy Lamp Switches, DTC 29; Shock Absorber Electronic Steering Sensor, DTC 45.