DTC B0432: Rear Defogger Relay Circuit (Open Or Short To Ground): Notes

WARNING: This page is about a different car, the 1997 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

When BCM receives a defogger ON request from rear defogger switch when engine is running, BCM will ground circuit No. 193 (White wire) to energize rear defogger relay. BCM monitors voltage level on rear defogger control circuit. When BCM activates rear defogger relay, voltage level in control circuit should be low. When relay is not activated, voltage level in control circuit should be high.

DTC B0432 will set when BCM detects a low voltage level in circuit No. 193 (White wire) for 2 seconds when it is not energizing rear defogger relay. No driver warning message will be displayed.

DTC B0432 requires an ignition cycle to change from current to history. If conditions for malfunction no longer exist, history DTC will clear after 50 consecutive ignition cycles. DTC B0432 will also clear when conditions no longer exist, or when IPC or scan tool is used to clear codes.

NOTE: If DTC B0432 is a history code, problem may be intermittent. Wiggle wires while performing the following test.