Circuit/System Testing

Windshield Washer Switch Circuit Test

1. Ignition OFF, disconnect the harness connector at the S82 windshield wiper/washer switch.
2. With RAP OFF, MDI disconnected, wait one minute, test for less that 5 Ω between the low reference terminal 2 and ground.
   • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.
3. Ignition ON, verify the scan tool Windshield Washer Switch parameter is INACTIVE.
   • If not the specified value, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the K9 BCM.
4. Install a 3 A fused jumper wire between the signal circuit terminal 5 and ground. Verify the scan tool Windshield Washer Switch parameter is ACTIVE.
   • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
5. If all circuits test normal, test or replace the S82 windshield wiper/washer switch.

Washer Pump Circuit Test

1. Ignition OFF, disconnect the X2 harness connector at the X50A underhood fuse block.
2. Connect a test lamp between the control circuit terminal 60 and ground.
3. Ignition ON, command the Windshield Washer Relay Command 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 K9 BCM.
   • 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 K9 BCM.
4. Ignition OFF, connect the X2 harness at the X50A underhood fuse block and disconnect the harness connector at the G24 windshield washer pump.
5. Test for less than 5 Ω between the ground circuit terminal 2 and ground.
   • If greater than the specified range, test the ground circuit for an open/high resistance.
6. Connect a test lamp between control circuit terminal 1 and ground.
7. Ignition ON, command the Windshield Washer Relay Command 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 X50A 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 X50A underhood fuse block.
8. If all circuits test normal, test or replace the G24 windshield washer pump.

Low Washer Fluid Indicator Malfunction

1. Ignition OFF, disconnect the harness connector at the B118B windshield washer fluid level sensor.
2. Test for less than 5 Ω between the ground terminal B and ground.
   • If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Washer Fluid Level Switch parameter is OFF.
   • If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the P16 instrument cluster.
4. Install a 3 A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Washer Fluid Level Switch parameter is ON.
   • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the P16 instrument cluster.
5. If all circuits test normal, test or replace the B118B windshield washer fluid level sensor.