Back Door Entry Lock Function Does Not Operate

THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function): Back Door Entry Lock Function does not Operate

Back Door Entry Lock Function does not Operate

DESCRIPTION

If the back door entry lock function does not operate but the back door open function operates, the communication line between the vehicle and electrical key transmitter is normal. The part of fault may be, the entry lock switch circuit (certification ECU (smart key ECU assembly) -> back door opener switch).

WIRING DIAGRAM









INSPECTION PROCEDURE
NOTE:
Before performing the inspection, check that there are no problems related to the "CAN Communication System" and "LIN Communication System".

PROCEDURE

1. CHECK POWER DOOR LOCK OPERATION
(a) When the door control switch of the master switch assembly is operated, check that the locked doors unlock.
OK:
Door locks operate normally.
NG -- GO TO POWER DOOR LOCK CONTROL SYSTEM
OK -- Continue to next step.
2. CHECK VEHICLE EQUIPMENT
(a) Check if the power back door is equipped on the vehicle.

Result





B -- READ VALUE USING TECHSTREAM (BACK DOOR LOCK SWITCH)
A -- Continue to next step.
3. CHECK POWER BACK DOOR OPERATION
(a) When the power back door switch is operated, check that the power back door closes.
OK:
Power back door is closes.
NG -- GO TO POWER BACK DOOR SYSTEM
OK -- Continue to next step.
4. READ VALUE USING TECHSTREAM (BACK DOOR LOCK SWITCH)
(a) Using the Techstream, read the Data List.

Smart Access





OK:
"ON" (switch is pushed) and "OFF" (switch is not pushed) appears on the screen.
NG -- CHECK BACK DOOR OPENER SWITCH
OK -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
5. CHECK BACK DOOR OPENER SWITCH




(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPLACE BACK DOOR OPENER SWITCH
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - BACK DOOR OPENER SWITCH)




(a) Disconnect the E29 ECU connector.
(b) Disconnect the S7 switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)