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Low Coolant Indicator Test

WARNING: This page is about a different car, the 1994 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
  1. If LOW COOLANT indicator comes on with coolant level okay, go to next step. If LOW COOLANT indicator does not light with coolant level okay, check if LOW COOLANT indicator comes on with coolant level low. If LOW COOLANT indicator comes on with coolant low, system is okay. If LOW COOLANT indicator does not light with coolant low, go to step 3).
  2. Disconnect low coolant sensor connector. Turn ignition on. If LOW COOLANT indicator is still on, check Yellow/Black wire for a short to ground. If wire is okay, replace information center. If LOW COOLANT indicator is not on, replace oil level module.
  3. Disconnect oil level module connector. Turn ignition on. Measure voltage between oil level module connector terminal No. 4 (Yellow/Black wire) and ground.
  4. If battery voltage is present, go to next step. If battery voltage is not present, disconnect IPC connector. Check Yellow/Black wire for an open circuit or high resistance. Also check information center connector for good terminal contact at terminal No. 2 (Yellow/Black wire). Check indicator bulb. If all components are okay, replace information center.
  5. Measure voltage between oil level module connector terminal No. 9 (Pink/Black wire). If battery voltage is present, go to next step. If battery voltage is not present, check instrument panel fuse block fuse 5A. Also check Pink/Black wire for an open circuit, high resistance, or short to ground.
  6. Measure voltage between oil level module connector terminal No. 10 (Orange wire) and ground. If battery voltage is not present, check instrument panel fuse block fuse 9C. Also check Orange wire for an open circuit, high resistance, or short to ground.
  7. If battery voltage is present, check oil level module connector for good contact at terminals No. 4 (Yellow/Black wire), No. 7 (Brown wire), No. 8 (Light Green wire), No. 9 (Pink/Black wire), and No. 10 (Orange wire). Disconnect low coolant sensor connector and check Brown, Light Green, and Red/White wire for an open circuit. See Figure Check low coolant sensor connector for good terminal contact at terminals "A" (Brown wire), "B" (Red/White wire), and "C" (Light Green wire). If all circuits are okay, replace low coolant sensor.
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