Defog Switch Fault

DEFOG SWITCH FAULT

Theory of Operation
The switch input changes when the switch is pushed down. A stored DTC indicates that the EBL mode switch was stuck in a pushed position for more than 10 minutes, but has since returned to its normal state. An active DTC indicates that the EBL mode switch is stuck in a pushed position. An active DTC will prevent proper switch and status indicator function as evidenced by not being able to turn the EBL status indicator either on if off or off if on.

WHEN MONITORED
With the ignition on.

SET CONDITION
If the EBL mode switch stays closed for 10 minutes.

POSSIBLE CAUSES
- A/C heater control

NOTE: This DTC must be active for the result of this test to be valid. Do not perform this test if this DTC is stored. Refer to HVAC System Test for stored DTC test procedures. HVAC System Test

Diagnostic Test

1. REPLACE THE A/C HEATER CONTROL

Repair
Replace the A/C Heater Control. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test