Component Testing
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
Turn Signal Multifunction Switch
- Disconnect the X3 harness connector at the multifunction switch.
- With the wiper switch in the HIGH position, test for less than 2 Ω between the low reference terminal M and the signal terminal K.
- If greater than the specified range, replace the windshield wiper washer switch.
- While cycling the wiper switch through each delay and speed position, test for the specified resistance between the low reference terminal M and the signal terminal N.
NOTE:
If the switch tests open in any switch position other than Off, test the signal circuits for a short to voltage before replacing the switch.
Wiper Switch Values
| Switch Position | Resistance |
|---|---|
| Off | Infinite |
| Mist | 300 - 364 Ω |
| Delay 1 | 3.48k - 4.25k Ω |
| Delay 2 | 2.52k - 3.08k Ω |
| Delay 3 | 1.78k - 2.18k Ω |
| Delay 4 | 1.17k - 1.44k Ω |
| Delay 5 | 697 - 851 Ω |
| Low | 300 - 364 Ω |
| High | 300 - 364 Ω |
Windshield Wiper Motor Dynamic Test
- Ignition OFF, disconnect the harness connector at the windshield wiper motor.
- Install a 25 A fused jumper wire between the control terminal B and 12 V. Install a jumper wire between the ground terminal A and ground.
- Verify the wiper motor is operating in the low speed mode.
- If the wiper motor is not in the low speed mode, replace the windshield wiper motor.
- Install a 25 A fused jumper wire between the control terminal C and 12 V. Install a jumper wire between the ground terminal A and ground.
- Verify the wiper motor is operating in the high speed mode.
- If the wiper motor is not in the high speed mode, replace the windshield wiper motor.