Test Lamp Procedure

With yellow and white wires disconnected from switch, connect a jumper wire from accessory terminal in fuse panel to one switch terminal. Connect test lamp to other terminal and ground. Observe test lamp, then reverse connections so jumper wire goes to other switch terminal. Test lamp should light in one position, but not both when switch is "OFF". With switch "ON", lamp should light in both directions.

Fig 1: American Motors Heated Rear Window Wiring Diagram

Courtesy of AMERICAN MOTORS/RENAULT CORP.