For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Engine Cooling Schematics DEFINITION: The low coolant indicator lamp is ON, without a low engine coolant level condition.
1 | Did you review the engine cooling system operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Engine Cooling
2 |

1. Check that the engine coolant level is full.
2. Turn ON the ignition with the engine OFF.

Does the low coolant indicator come on for bulb check, then go out?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3 |

1. Turn OFF the ignition.
2. Disconnect the coolant level switch.
3. Turn ON the ignition with the engine OFF.
4. Connect a fused jumper wire between the coolant level switch signal circuit and the ground circuit of the coolant level switch connector.

Does the low coolant level indicator turn off?

Go to Step 8

Go to Step 4

4 | Test the ground circuit of the low coolant level switch for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 5
5 | Test the low coolant level switch signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 6
6 |

1. Turn OFF the ignition.
2. Disconnect the Multifunction Alarm Module (MFAM).
3. Turn ON the ignition with the engine OFF.

Does the low coolant indicator turn OFF?

Go to Step 9

Go to Step 7

7 | Test the coolant indicator control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 10
8 | Inspect for poor connections at the harness connector of the coolant level switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 11
9 | Inspect for poor connections at the harness connector of the Multifunction Alarm Module (MFAM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 12
10 | Inspect for poor connections at the harness connector of the Instrument Panel Cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 13
11 | Replace the surge tank. Refer to Radiator Surge Tank Replacement . Did you complete the replacement? | Go to Step 14 | --
12 | Replace the Multifunction Alarm Module (MFAM). Refer to Multifunction Alarm Module Replacement in Instrument Panel, Gages and Console. Did you complete the replacement? | Go to Step 14 | --
13 | Replace the Instrument Panel Cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages and Console. Did you complete the replacement? | Go to Step 14 | --
14 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2