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HOMESERVICE MANUALSSUBARU2014FORESTER 2.5I, ENG CD FB25BA, STANDARD TRANSREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESLAN SYSTEM (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC U1602: LOST COMMUNICATION WITH POWER REAR GATE CONTROL MODULEWIRING DIAGRAM
2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard Trans

DTC U1602: Lost Communication With Power Rear Gate Control Module: Wiring Diagram

2014 Subaru Forester 2.5i, Eng CD FB25BA, Standard TransSECTION Wiring Diagram

Power rear gate system < Ref. to WIRING DIAGRAM , Power Rear Gate System. >

Fig 1: Power Rear Gate Control Module Wiring Diagram
G09485286Courtesy of SUBARU OF AMERICA, INC.
DTC PROCEDURE

Step Check Yes No
1 CHECK DTC  .
Read the DTC of body integrated unit using Subaru Select Monitor.		 Is U1602 a current malfunction? Go to step 2  . It is possible that temporary poor contact occurs. Perform the clear memory.
2 CHECK DTC  .
  1. Turn the ignition switch to OFF.
  2. Disconnect the power rear gate Control Module and body integrated unit connectors.
  3. Connect the disconnected connectors.
  4. Using the Subaru Select Monitor, read DTC of CAN system.
 Is U1602 a current malfunction? Go to step 3  . It is possible that temporary poor contact occurs. Perform the clear memory.
3 CHECK HARNESS  .
  1. Turn the ignition switch to OFF.
  2. Disconnect the power rear gate Control Module and body integrated unit connectors.
  3. Using the tester, measure the resistance between terminals.

    Connector & terminal 

    (i171) No. 16 - (R423) No. 1: 

    (R422) No. 14 - Chassis ground: 

    (R423) No. 8 - Chassis ground: 

 Is the resistance less than 10 Ω? Go to step 4  . Repair the open circuit of harness.
4 CHECK HARNESS  .
Using the tester, measure the resistance between terminals.
Connector & terminal 
(R423) No. 1 - Chassis ground: 		 Is the resistance 10 kΩ or more? Go to step 5  . Repair the shorted portion of harness.
5 CHECK HARNESS  .
  1. Turn the ignition switch to ON.
  2. Using the tester, measure the voltage between terminals.

    Connector & terminal 

    (R423) No. 1 (+) - Chassis ground (-): 

 Is the voltage less than 1 V? Go to step 6  . Repair the shorted portion of harness.
6 CHECK HARNESS  .
Using the tester, measure the voltage between terminals.
Connector & terminal 
(R422) No. 1 (+) - Chassis ground (-): 
(R422) No. 10 (+) - Chassis ground (-): 
(R422) No. 8 (+) - Chassis ground (-): 		 Is the voltage 9 V or more when the IG switch is ON? Go to step 7  . Repair the open circuit of harness.
7 CHECK POWER REAR GATE SYSTEM  .
Perform the inspection of the power rear gate system. < Ref. to PROCEDURE , Basic Diagnostic Procedure. >		 Is there any fault? Perform the inspection according to the inspection of the power rear gate system. Go to step 8  .
8 CHECK CONTROL MODULE  .
  1. Turn the ignition switch to OFF.
  2. Replace the power rear gate Control Module with a properly functioning part.
  3. Using the Subaru Select Monitor, read DTC of CAN system.
 Is U1602 a current malfunction? Perform the basic diagnostic procedure of the body control system < Ref. to PROCEDURE , Basic Diagnostic Procedure. >, and if there is no problem, replace the body integrated unit. < Ref. to REMOVAL , Body Integrated Unit. > System is normal.
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