Test C (Code 43) Air Spring Solenoid Shorted
NOTE:
Resistance measurements in this procedure check condition of air spring solenoid valve coil and diode. Digital ohmmeters will not pass enough current through diode to check its condition. Use Rotunda Tester (059-00010) or equivalent analog ohmmeter.
- Turn air suspension switch to OFF position. Disconnect control module connector. Turn air suspension switch to ON position. Measure resistance between pins No. 13 and 1 on module connectors. Reverse leads and measure resistance again between pins No. 13 and 1. Resistance should be 15-18 ohms one way, and 5-10 ohms less in other direction. 1a) If higher reading is 15-18 ohms and lower reading is 5-10 ohms less than higher reading, solenoid is good. Go to next step. If both readings are the same, 0-18 ohms, problem exists with left air spring solenoid or wiring. Go to next step.
- Measure resistance between pins No. 25 and 1 on module connectors. Reverse leads and measure resistance again between pins No. 25 and 1. Ohmmeter should indicate 15-18 ohms in one direction and 5-10 ohms less in other direction. If readings are the same in both directions in this step and/or step 1), go to next step. 2a) If higher reading is 15-18 ohms, lower reading is 5-10 ohms less than higher reading and left spring solenoid was okay in step 1), replace control module. Repeat SERVICE BAY DIAGNOSTICS under TESTING & DIAGNOSIS.
- Ensure air suspension switch is in ON position and module connectors are disconnected. Raise vehicle on hoist. Disconnect air spring solenoid valve connector. Inspect connector to ensure circuit No. 414 (Orange/Red wire) and circuit No. 416 (Light Blue/Black wire) or circuit No. 414 (Orange/Red wire) and circuit No. 429 (Purple/Light Green wire) are not reversed in connector. Measure voltage between circuit No. 416 (Light Blue/Black wire) and ground and/or circuit No. 429 (Purple/Light Green wire) and ground. See Fig 1 . Zero volts should be indicated. Measure voltage between circuit No. 414 (Orange/Red wire) and ground. Battery voltage should be indicated. 3a) If circuit No. 416 or No. 429 indicates zero volts, replace air spring solenoids. If battery voltage is indicated at circuits No. 414 and No. 416 or circuit No. 429, repair short circuit to battery in circuit No. 416 and/or No. 429. If circuits are reversed in connector, install circuits in correct terminals.
NOTE:
Repeat SERVICE BAY DIAGNOSTICS under TESTING & DIAGNOSIS to verify repairs.