Wiper Pulse Control Resistance Test
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 1991 Pontiac Grand Prix, 1991 Pontiac Grand Am, 1991 Pontiac Firebird, 1991 Pontiac Bonneville, and 1991 Pontiac 6000. However, it is still accessible from the selected car via links, so may be relevant.
- Perform test with wiper motor module connector C1 and negative battery cable disconnected. Ensure ignition switch is in OFF position and wiper/washer switch is in LO position. Use an ohmmeter to measure resistance between C1 terminal "B" (Gray wire) and C1 terminal "F" (Pink wire). If resistance is approximately 24 k/ohms, replace wiper motor module cover.
- If reading is infinite ohms, check for open circuits No. 94 (Pink wire) and No. 91 (Gray wire). If wires are okay, replace wiper/washer switch. Move wiper delay switch to maximum delay position. Check resistance between C1 terminal "B" (Gray wire) and C1 terminal "F" (Pink wire).
- If reading is approximately 1.2 megohms, replace wiper motor module cover. If reading is infinite ohms, check for open circuits No. 94 (Pink wire) and No. 91 (Gray wire). If wires are okay, replace wiper/washer switch.