FCM-Washer Fluid Level Sensor Circuit Failure

FCM-WASHER FLUID LEVEL SENSOR CIRCUIT FAILURE

FCM - Washer Fluid Level Sensor Circuit Failure:

WHEN MONITORED
Continuous with the ignition on.

SET CONDITION
The FCM detects the Washer Fluid Level Switch circuit voltage is below 0.05 volts or above 5.0 volts.

POSSIBLE CAUSES
- Washer fluid level switch
- Washer fluid level sensor signal circuit open
- Washer fluid level switch ground circuit open
- Washer fluid level switch signal circuit short to ground
- Front control module

Diagnostic Test

1. WASHER FLUID LEVEL SWITCH




Turn the ignition off.
Disconnect the Washer Fluid Level Switch harness connector.
Connect a jumper wire between cavity 1 and cavity 2.
With the DRBIII(R), in Sensors, read the Washer Fluid Level Switch Volts.

Q: Does the DRBIII(R) read below 1 volt?

YES: Replace the Washer Fluid Level Switch. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 2

2. WASHER FLUID LEVEL SWITCH SIGNAL CIRCUIT OPEN




Turn the ignition off.
Disconnect the FCM harness connector.
Disconnect the Washer Fluid Level Switch harness connector.
Measure the resistance of the Washer Fluid Level Switch Signal circuit.

Q: Is the resistance above 5.0 ohms?

YES: Repair the Washer Fluid Level Sensor Signal circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 3

3. WASHER FLUID LEVEL SWITCH GROUND CIRCUIT OPEN




Turn the ignition off.
Disconnect the FCM harness connector.
Disconnect the Washer Fluid Level Switch harness connector.
Measure the resistance of the Washer Fluid Level Switch Ground circuit.

Q: Is the resistance above 5.0 ohms?

YES: Repair the Washer Fluid Level Switch Ground circuit for an open. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 4

4. WASHER FLUID LEVEL SWITCH SIGNAL CIRCUIT SHORT TO GROUND




Turn the ignition off.
Disconnect the FCM harness connector.
Disconnect the Washer Fluid Level Switch harness connector.
Measure the resistance between ground and the Washer Fluid Level Switch Signal circuit.

Q: Is the resistance below 5.0 ohms?

YES: Repair the Washer Fluid Level Switch Signal circuit for a short to ground. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Front Control Module (FCM). Perform BODY VERIFICATION TEST - VER 1. Body Verification Test