Component Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Multifunction Switch
- With the ignition OFF, disconnect the C1 harness connector at the turn signal/multifunction switch.
- Test the resistance between terminals H and L. Rotate the wiper switch and compare the resistance readings to the values in the Windshield Wiper Switch Values table below for MIST, each DELAY and LOW speed.
- If the resistance is not within the specified range, replace the turn signal/multifunction switch.
- Test for infinite resistance between terminals H and K while rotating the wiper switch to MIST, each DELAY and LOW speed positions.
- If the less than infinite, replace the turn signal/multifunction switch.
- Test for less than 5 ohms of resistance with the wiper switch in the High speed position..
- If greater than 5 ohm, replace the turn signal/multifunction switch.
- Test for infinite resistance between terminals H and J while rotating the wiper switch to MIST, each DELAY and LOW speed positions.
- If less than infinite, replace the turn signal/multifunction switch.
- Test for less than 5 ohm of resistance while pressing the WASHER switch.
- If greater than 5 ohm, replace the turn signal/multifunction switch.
IMPORTANT:
If the switch tests open in any switch position other than Off, test the wiper/washer switch 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 |
Windshield Wiper Motor Dynamic Test
- Ignition OFF, disconnect the harness connector at the windshield wiper motor.
- Install a 25-amp fused jumper wire between the control terminal B and 12 volts. Install a jumper wire between the ground terminal A and ground.
- The wiper motor should be in low speed mode.
- If the wiper motor is not in the low speed mode replace the motor.
- Install a 25-amp fused jumper wire between the control terminal A and 12 volts. Install a jumper wire between the ground terminal D and ground.
- The wiper motor should be in the high speed mode.
- If the wiper motor is not in the high speed mode replace the motor.