Circuit/System Testing

WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Ignition OFF, disconnect the air suspension inflator switch harness connector X2 at the air suspension compressor assembly.
- If the compressor continues to run, test or replace the air suspension compressor assembly.
Test for less than 2.0 ohms between the ground circuit connector X2, terminal B and ground.
- If greater than the specified value, test the air suspension compressor assembly ground circuit for an open/high resistance. If the circuit tests normal, replace the air suspension compressor assembly.
Perform the air suspension inflator switch component test.
- If the air suspension inflator switch fails the component test, replace the switch.
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.
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.