Inspection steps
WARNING:
- Window defogger system uses CAN communication. First, perform a "Communication function inspection", following "How to troubleshoot", and after checking for any malfunction in the communication system, you can proceed with troubleshooting.
- Before performing the troubleshooting, check the fuse of this circuit.
- Implementation of SSM4 active test (Rr defogger output)
- Using SSM4, perform an [Active Test] by following the display.
BODY CONTROL ACTIVE TEST DESCRIPTIONItem name Contents of testing Constraints [Rr Defogger output] Rear defogger output ON/OFF - RESULT REFERENCEResult Go to Window defogger is not activated. A Window defogger is activated. B B: Perform the circuit test shown on the symptom table. (Refer to Symptom table )
A
- Unit inspection of defogger relay (RR DEF relay)
- Perform unit inspection of the defogger relay (RR DEF relay). (Refer to Trunk opener system )
NG: Replacement of defogger relay (RR DEF relay)
OK
- Inspection of wire harness and connector (defogger relay - IG 1 No. 1 relay and battery)
- Detach the defogger relay (RR DEF relay) from the engine compartment relay block.
- Measure the voltage between the terminals.
VOLTAGE SPECIFICATIONInspection terminals Inspection conditions Standard value 1 - Chassis ground IG ON 11 to 14 V 5 - Chassis ground Always 11 to 14 V Courtesy of SUBARU OF AMERICA, INC.
NG: Repair or replacement of wiring harness or connector
OK
- Inspection of wire harness and connector (defogger relay - main body ECM (network gateway computer))
- Detach the defogger relay (RR DEF relay) from the engine compartment relay block.
- Disconnect the A73 connector of the main body ECM (network gateway computer).
- Measure the resistance between the terminals.
RESISTANCE SPECIFICATIONInspection terminals Inspection conditions Standard value 2 - A73-24 Always Less than 1 Ω 2 - Chassis ground Always 10 kΩ or more RESULT REFERENCEItem Go to NG A OK (except for automatic air conditioning) B OK (for automatic air conditioning system) C B: Step 5.
C: Step 7.
A: Repair or replacement of wiring harness or connector
- Inspection of wire harness and connector (main body ECM (network gateway computer) - heater control SUB-ASSY)
- Disconnect the connector D6 for the main body ECM (network gateway computer).
- Disconnect the connector D22 of the heater control SUB-ASSY.
- Measure the resistance between the terminals.
RESISTANCE SPECIFICATION (OPEN CIRCUIT CHECK)Inspection terminals (Terminal symbol) Inspection conditions Standard value D6-5 - D22-2 (RDEF+) Always Less than 1 Ω RESISTANCE SPECIFICATION (SHORT CIRCUIT CHECK)Inspection terminals Inspection conditions Standard value D6-5 - Chassis ground Always 10 kΩ or more NG: Repair or replacement of wiring harness or connector
OK
- Unit inspection of heater control SUB-ASSY (Rear defogger switch)
- Detach heater control SUB-ASSY (Rear defogger switch) (Refer to Removal )
- Perform unit inspection of heater control SUB-ASSY (Rear defogger switch) (Refer to Unit inspection )
NG: Replacement of rear defogger switch
OK
- Inspection of wire harness and connector (back window glass - defogger relay and chassis ground)
- Disconnect the connectors G10 and H29 for the back window glass.
- Detach the defogger relay (RR DEF relay) from the engine compartment relay block.
- Measure the resistance between the terminals.
RESISTANCE SPECIFICATION (OPEN CIRCUIT CHECK)Inspection terminals Inspection conditions Standard value H29-1 - 5 Always Less than 1 Ω RESISTANCE SPECIFICATION (SHORT CIRCUIT CHECK)Inspection terminals Inspection conditions Standard value H29-1 - Chassis ground Always 10 kΩ or more G10-1 - Chassis ground Always Less than 1 Ω NG: Repair or replacement of wiring harness or connector
OK: Replacement of the back window glass (Refer to Removal )