Inflator Switch Indicator Malfunction
Inflator Switch Indicator Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions)provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The air suspension system has the feature to utilize the air compressor as a compressed air source. When the air suspension inflator switch is activated the compressor receives a ground signal requesting compressor activation. The compressor then applies voltage to the indicator control circuit illuminating the indicator. Upon compressor activation, supplied air pressure is then diverted from the air suspension to the air supply access port.
Diagnostic Aids
The Inflator Switch Indicator Light Emitting Diode (LED) is part of the Air Suspension Inflator Switch. A complete Air Suspension Inflator Switch replacement needs to be done if the inflator switch indicator LED needs to be replaced.
Reference Information
Schematic Reference
Air Suspension Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Component Connector End Views)
Description and Operation
Air Suspension Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Programming and Relearning (Programming and Relearning)for Scan Tool Information
Circuit/System Verification
Ignition ON, activate the air suspension inflator switch. The switch indicator should illuminate and the air compressor should activate supplying air pressure to the air accessory port.
Circuit/System Testing
1. Ignition ON, connect a fused jumper between terminal A at the air suspension compressor assembly and ground. Verify that the compressor operates.
• If the compressor does not operate, test the IGN 3 and B+ circuits for an open/high resistance or short to ground. If all circuits test normal, test or replace the air suspension compressor assembly.
2. Ignition ON and the fused jumper still connected, verify that a test lamp illuminates between the switch indicator control circuit terminal C and ground.
• If the test lamp does not illuminate, test or replace the air suspension compressor assembly.
• If the test lamp illuminates, test the indicator control circuit for an open/high resistance, short to ground, or a short to voltage. If the circuit tests normal, replace the air suspension inflator switch.
Component Testing
Air Suspension Inflator Switch
1. Ignition OFF, disconnect the harness connector X451 at the air suspension compressor assembly.
2. Test for infinite resistance between the signal terminal C and the ground terminal B with the switch in the OFF position.
• If not the specified value, replace the air suspension inflator switch.
3. Test for less than 2 ohms between the signal terminal C and the ground terminal B with the switch in the ON position.
• If greater than the specified value, replace the air suspension inflator switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Inflator Air Switch Replacement (SUT) (Inflator Air Switch Replacement (SUT))Inflator Air Switch Replacement (SUV) (Inflator Air Switch Replacement (SUV))
* Upon a compressor assembly replacement the Suspension Position Calibration (Suspension Position Calibration) needs to be performed.
* Compressor Assembly Automatic Level Control Air Replacement (Dual Compressors) (Compressor Assembly Automatic Level Control Air Replacement (Dual Compressors))