Wiper Switch Tests

Check continuity using a test lamp or ohmmeter. Continuity should exist between various switch positions as shown in chart ( Fig 1 ).
Variable resistance between terminals "4" and "5" must be checked with an ohmmeter. The resistance controls governor operation for intermittent wipe. If intermittent wipe is inoperative, but system will operate at high and low speeds, this resistance should be checked. With switch control knob rotated to full counterclockwise position, ohmmeter should indicate 5, 600 to 8, 400 ohms. As control knob is rotated in a clockwise direction, resistance should decrease to minimum of 100 to 900 ohms.

Fig 1: Continuity Test Chart For Wiper Switches
Courtesy of AMERICAN MOTORS/RENAULT CORP.

Fig 2: Exploded View Of AMC Wiper Motor & Transmission
Courtesy of AMERICAN MOTORS/RENAULT CORP.
If continuity and resistance do not exist as specified, replace switch.