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Wipers Operate At Lo Speed; Switch In HI Position

  1. Turn ignition on. Connect a DVOM between Blue/Red wire at wiper motor connector and ground. Set wiper/washer switch to HI position. Check voltage. If voltage is 10 volts or less, go to next step. If voltage is greater than 10 volts, replace wiper motor.
  2. Using test light, probe Blue wire at wiper motor connector. If test light comes on, replace combination switch. If test light does not come on, go to next step.
  3. Turn ignition to lock. Unplug combination switch connector. Unplug junction block connector C4 (located behind left kick panel). See Fig 1 . Using a DVOM, check resistance between Yellow/Black wire at junction block connector and Blue/Red wire at combination switch connector terminal (switch side). If resistance is greater than 5.0 ohms, replace combination switch. If resistance is 5.0 ohms or less, check for open in Blue/Red between combination switch and junction block connector C4. If wire is okay, replace wiper motor.
Fig 1: Junction Block Connector C4 Terminal ID
G93B83379Courtesy of GENERAL MOTORS CORP.
JUNCTION BLOCK CONNECTOR C4 TERMINAL ID

Cavity Wire Color Circuit
1 YEL/BLU Hazard Lamps Power Feed
2 --- Not Used
3 RED Headlamps/High Beams
4 WHT Tail Fuse
5 BLU Parking Lamps
6 --- Not Used
7 BLU/GRN Horn Relay
8 YEL/BLK WIP Fuse
9 PNK/YEL Back Fuse
10 RED/WHT Headlamps/Low Beams