SRX AWD V6-3.0L (2010)
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Engine running, observe the scan tool Rear Defogger Switch parameter while pressing the heated rear window switch. The parameter should
change from Inactive to Active.
‹› If the value does not change, replace the HVAC control.
2. Observe the operation of the rear window defogger indicator while pressing the heated rear window switch. The indicator should turn ON or OFF
each time the heated rear window switch is pressed.
‹› If the indicator does not turn ON or OFF with each switch press, replace the HVAC control.
3. Command the Rear Defog ON and OFF with a scan tool, the rear defogger grid should turn ON or OFF while changing between the commanded
states.
Circuit/System Testing
1. Ignition OFF, disconnect the KR5 rear defogger relay.
2. Test for less than 30 ohm between the ground circuit terminal 86 and ground.
‹› If greater than the specified range, test the ground circuit for an open/high resistance.
3. Engine running, verify a test lamp does not illuminate between the control circuit terminal 87 and ground.
‹› If the test lamp illuminates, test the control circuit for a short to voltage.
4. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.
‹› If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
5. Ignition OFF, disconnect the X2 harness connector at the E18 rear defogger grid.
6. Test for less than 30 ohm between the ground circuit terminal A and ground.
‹› If greater than the specified range, test the ground circuit for an open/high resistance.
7. Connect the X2 harness connector at the E18 rear defogger grid.
8. Engine running, connect a 40 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the E18 rear
defogger grid is activated.
‹› If the rear defogger grid does not activate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal,
test or replace the E18 rear defogger grid.
9. Connect a test lamp between the control circuit terminal 85 and the ground circuit terminal 86.
10. Command the rear defogger grid ON and OFF by pressing and depressing the heated rear window switch, 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 K33 HVAC 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
K33 HVAC control module.
11. If all circuits test normal, test or replace the KR5 rear defogger relay.
Component Testing
Rear Window Defogger Grid Test
1. Engine running, turn on the rear defogger grid.
2. Verify that a test lamp illuminates between each rear window defogger grid line and ground. The test lamp should be off when testing at the
ground side of the grid and get brighter as the test lamp moves closer to the voltage supply side of the grid. The test lamp should be dim when
testing each grid line in the middle.
‹› If the test lamp remains bright at the middle of the grid line, test for an open between the test point and the ground side of the grid.
‹› If the test lamp remains off at the middle of the grid line, test for an open between the test point and the voltage supply side of the grid.
