Air Locker Activation System Troubleshooting Guide (CKSA12)

The following describes an effective procedure for tracing an electrical fault in an ARB CKSA12 compressor which has been wired using a genuine ARB wiring loom. All steps must be performed in the order listed here for an accurate assessment.

NOTE: Before attempting to troubleshoot a malfunctioning compressor, always make sure that the compressor manifold has been de-pressurized, all connections have been made according to the wiring diagram, the vehicle's ignition is in the accessory power position, and that the isolation switch has been turned 'ON'.

1.  Using a multimeter, check the voltage at the battery terminals to make sure the battery is working and fully charged.
   
   Did the battery measure at least 11.5v?
   
   YES - Proceed to STEP 2
   NO - Insufficient battery voltage. Recharge or replace the battery.
   
   
2.  Disconnect the compressor motor from the wiring loom at the connector plug. Run a wire directly from the negative terminal of the battery to the BLACK wire of the compressor motor. Momentarily connect a wire from the positive battery terminal to the RED wire of the compressor motor.
   
   Did the compressor activate when the wires were connected?
   
   YES - Remove extra wires and reconnect the compressor motor plug. Proceed to STEP 3
   NO - Internal compressor problem, contact ARB for further assistance.
   
   
3. Using a multimeter, check for battery voltage (approx. 12v) at the RED/YELLOW wire connected to terminal #2 of the compressor isolation switch (i.e. the wire leading from the vehicle's accessory power.)
   
   Was battery voltage detected?
   
   YES - Proceed to STEP 4
   NO - Wire has not been connected correctly or accessory power has not been turned on. Attach RED/YELLOW wire to live accessory power.
   
   
4. Using a multimeter, check for battery voltage (approx. 12v) at the SOLID RED wire connected to terminal #3 of the compressor isolation switch (while still connected).
   
   Was battery voltage detected?
   
   YES - Proceed to STEP 5
   NO - Switch fault or switch not turned 'ON'. Replace switch or toggle switch to 'ON' position.
   
   
5. Using a multimeter, check for battery voltage (approx. 12v) at the SOLID RED wire connected to the pressure switch installed into the compressor manifold.
   
   Was battery voltage detected?
   
   YES - Proceed to STEP 6
   NO - Wiring fault between the isolation switch and the pressure switch. Replace wiring.
   
   
6. Using a multimeter, check for battery voltage (approx. 12v) at the RED/WHITE wire connected to the pressure switch installed into the compressor manifold (while still connected).
   
   Was battery voltage detected?
   
   YES - Proceed to STEP 7
   NO - Pressure switch fault or compressor not de-pressurized. Replace switch or drain pressure.
   
   
7. Disconnect the compressor motor from the wiring loom at the connector plug. Using a multimeter, check for battery voltage (approx. 12v) at the RED/WHITE wire on the loom side of the plug.
   
   Was battery voltage detected?
   
   YES - Proceed to STEP 8
   NO - Wiring fault between the pressure switch and the compressor motor connector. Replace wiring.
   
   
8. Using a multimeter, check the resistance (Ohms), between the SOLID BLACK wire on the loom side of the plug (not the compressor side) and the negative terminal of the battery.
   
   Did the resistance measure less than 1 Ohm?
   
   YES - Intermittent fault or internal compressor problem. Contact ARB for further assistance.
   NO - Wiring fault in the ground wire between the battery and the compressor motor. Replace wiring.