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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Circuit/System Verification must be performed before performing the Circuit/System Testing.
  1. Ignition OFF, disconnect the harness connector at the B33 coolant level switch.
  2. Test for less than 5 Ω between the ground circuit terminal 1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, observe the scan tool Coolant Level Switch parameter. The parameter should display OK.
    • If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the P16 IPC.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 1. Verify the scan tool Coolant Level Switch parameter displays Low, and the low coolant lamp in the IPC is ON.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the P16 IPC.
  5. If all circuits test normal, test or replace the B33 coolant level switch.
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