Circuit/System Testing

Multifunction Switch Circuit/System Testing

1. Ignition OFF, disconnect the X3 harness connector at the turn signal/multifunction switch.
2. Ignition OFF, test for less than 15 ohms of resistance between the ground circuit terminal D and ground.
   • If greater than 15 ohms, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the body control module.
3. Verify the scan tool Windshield Wiper Switch parameter is Off.
   • If not Off, test the signal circuit terminal N for a short to ground. If the circuit tests normal, replace the body control module.
4. Verify the scan tool Wiper High Speed Switch parameter is Inactive.
   • If not Inactive, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the body control module.
5. Install a 3-amp fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool Windshield Wiper Switch parameter is Switch Fault.
   • If not Switch Fault, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the body control module.
6. Install a 3-amp fused jumper wire between the signal circuit terminal C and ground. Verify the scan tool Wiper High Speed Switch parameter is Active.
   • If not Active, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the body control module.
7. If all circuits test normal, replace the turn signal/multifunction switch.

Wipers Do Not Park Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the windshield wiper motor.
2. Ignition ON, verify the scan tool BCM Wiper Park Switch parameter is Inactive.
   • If not Inactive, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the body control module.
3. Install a 3-amp fused jumper wire between the wiper motor park switch signal circuit terminal B and ground. Verify the scan tool Wiper Park Switch parameter is Active.
   • If not Active, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the body control module.
4. If all circuits test normal, replace the windshield wiper motor.

Wiper Motor Circuit/System Testing

1. Ignition OFF, disconnect the I/P fuse block connectors X2 and X3.
2. Test for less that 5 ohms of resistance between the wiper relay ground circuit in connector X3 terminal 2 and ground.
   • If greater than 5 ohms, test the ground circuit for an open/high resistance.
3. Connect a test lamp from the WIPER relay control circuit in connector X2 terminal 32 to ground.
4. Ignition on, command the Wiper Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
   • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the body control module.
   • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the body control module.
5. Connect a test lamp from battery voltage to the WIPER HIGH relay control circuit in connector X2 terminal 31.
6. Command the Wiper High Speed Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
   • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the body control module.
   • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the body control module.
7. Ignition OFF, connect the underhood fuse block.
8. Disconnect the harness connector at the wiper motor.
9. Test for less that 1 ohm of resistance between the wiper motor ground circuit terminal C and ground.
   • If greater than 1 ohm, test the ground circuit for an open/high resistance.
10. Connect a test lamp between the low speed motor control circuit terminal E and ground.
11. Ignition on, command the Wiper Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the underhood fuse block.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the underhood fuse block.
12. Connect a test lamp between the high speed motor control circuit terminal D and ground.
13. Command the Wiper High Speed Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the underhood fuse block.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the underhood fuse block.
14. If all circuits test normal, replace the windshield wiper motor.