Viper RT-10 V10-8.0L VIN E (1997)
Heated Glass Element Switch: Testing and Inspection
The rear window defogger switch has three functions: provide illumination for nighttime visibility, provide driver input for the rear window defogger
relay and informs the driver of operation through an LED. The switch has two ground circuits, one for the illumination lamp and the other for a switch
ground and LED ground.
1. Remove the defogger switch. Refer to removal procedures.
Rear Window Defogger Switch
2. Using a jumper wire connect one end to a battery source, and the other to Pin 2 of the switch. Connect a second jumper wire to negative source
and the other end to Pin 3. The lamp should light, If not, replace switch. If OK, go to Step 3.
3. Using a voltmeter, test Cavity 2 for voltage. The voltage varies with panel intensity with the dimmer switch. If OK, go to Step 4. If not OK, test
circuit back to the dimmer switch.
4. Using a jumper wire connect one end to a battery source, and the other to Pin 1 of the switch. Connect a second jumper wire to negative source
and the other end to Pin 3. The LED should light, If not, replace defogger switch. If OK, go to Step 5.
5. Using a ohmmeter, connect the leads to Pin 4 and Pin 5. When the switch is at rest there should be no continuity, press and hold button, it should
show continuity If OK, test rear window defogger relay and circuit. If not OK, replace defogger switch.
The rear window defogger operation can be checked by turning the system ON and feeling the glass. A distinct difference in temperature between the
grid lines and the adjacent clear glass can be detected in three to four minutes of operation.
