Instrument Cluster

90A1-COOLANT LEVEL SWITCH CIRCUIT HIGH (BCM)





For a complete wiring diagram refer to Diagrams/Electrical.







Diagnostic Test

1. CHECK FOR ACTIVE DTC

Turn the ignition on.

With the scan tool, read DTCs.

Is the DTC active?

Yes

- Go To 2

No

- The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.


2. COOLANT LEVEL SWITCH

Turn the ignition off.

Disconnect the Coolant Level Switch harness connector.

Connect a jumper wire between the Coolant Level Switch circuits in the harness connector.

Turn the ignition on.

With the scan tool, read DTCs.

Is the DTC active?

Yes

- Go To 3

No

- Replace the Coolant Level Switch.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests


3. COOLANT LEVEL SWITCH SIGNAL CIRCUIT OPEN

Turn the ignition off.

Disconnect the BCM C9 harness connector.

Measure the resistance of the Coolant Level Switch Signal circuit.

Is the resistance above 10K ohms?

Yes

- Repair the Coolant Level Switch Signal circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests

No

- Go To 4
-


4. COOLANT LEVEL SWITCH RETURN CIRCUIT OPEN

Measure the resistance of the Coolant Level Switch Return circuit.

Is the resistance above 10K ohms?

Yes

- Repair the Coolant Level Switch Return circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests

No

- Replace the BCM.
- Perform the BODY VERIFICATION TEST - VER 1. Verification Tests