Test L (Code 71): Height Sensor Circuit Open

NOTE: For TEST "L" pin test connector locations. See Fig 1.

Turn ignition switch to RUN position. Turn air suspension switch to ON position. Enter Functional Test mode. See FUNCTIONAL TEST under TESTING & DIAGNOSIS. DO NOT select test at this time. Tester button should remain in TEST (down) position. Raise vehicle on hoist. Ensure height sensor electrical connector is connected and that connector and wiring are in good condition. If connector and wiring are in good condition, go to next step. If connector and/or wiring are worn or damaged, repair as needed. Repeat SERVICE BAY DIAGNOSTICS under TESTING & DIAGNOSIS.
Disconnect height sensor. Measure voltage between circuits No. 427 (Pink/Black wire) and 428 (Orange/Black wire) and ground. Meter should indicate 4 volts. If 4 volts is present, go to next step. If zero volt is present, repair open circuit(s) as necessary. See Figure. Repeat SERVICE BAY DIAGNOSTICS under TESTING & DIAGNOSIS.
Measure resistance between circuit No. 432 (Black/Pink wire) in height sensor connector and ground. Meter should indicate less than 10 ohms. If resistance is less than 10 ohms, go to next step. If resistance is 10 ohms or more, repair open in circuit No. 432 (Black/Pink wire). Repeat SERVICE BAY DIAGNOSTICS under TESTING & DIAGNOSIS.

Fig 1: Height Sensor Harness Check
Turn air suspension switch and ignition switch to OFF position. Disconnect control module connectors. Check for continuity and measure resistance of circuit No. 432 (Black/Pink wire) between pin No. 8 of Black control module connector and height sensor connector. Meter should indicate less than 10 ohms. If resistance is less than 10 ohms, replace height sensor. If Code 71 is displayed, replace control module. If no continuity exists, repair open in circuit No. 432 (Black/Pink wire).

NOTE: Repeat SERVICE BAY DIAGNOSTICS under TESTING & DIAGNOSIS to verify repairs.