POWER DOOR LOCK CONTROL SYSTEM Only Back Door LOCK / UNLOCK Functions do not Operate

DESCRIPTION

• The main body ECU detects the condition of the back door opener switch.

• The main body ECU receives signals from the back door opener switch and activates the back door lock motor according to the signals.

• The main body ECU detects the condition of the back door courtesy switch.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   SYSTEM CHECK

   
   

   1. Check if the vehicle is equipped with a back door closer system.

      Result
      Result Proceed to w/o Back Door Closer System A w/ Back Door Closer System B

   
   
   • AClick here
   • BClick here
2. Click here

   READ VALUE USING INTELLIGENT TESTER (BACK DOOR OPENER SWITCH)

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the intelligent tester on.

   4. Enter the following menus: Body / Main Body / Data List.

   5. Read the Data List according to the display on the intelligent tester.

      Table 1. Main Body (Main Body ECU)

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Back Door Open Handle SW	Back door opener switch/ON or OFF	ON: Back door opener switch is pushed OFF: Back door opener switch is not pushed	-

      OK
      On the tester screen, the item changes between ON and OFF according to the chart above.

   
   
   • OKClick here
   • NGClick here
3. Click here

   INSPECT BACK DOOR LOCK ASSEMBLY

   
   
   1. 

      Remove the back door lock assembly (Click here).

   2. Check operation of the door lock motor.

      
      

      1. Move the door lock to the lock position.

      2. Apply battery voltage to the door lock motor and check the operation of the door lock motor.

         Measurement Condition	Specified Condition
         Battery positive (+) → Terminal 2 Battery negative (-) → Terminal 1	Unlocks

   3. Check operation of the door courtesy switch.

      
      

      1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition 1 - 3 Locked 10 kΩ or higher 1 - 3 Unlocked Below 1Ω

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK WIRE HARNESS AND CONNECTOR

   
   

   1. Disconnect the main body ECU connectors.

   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition U8-2 (ACT+) - G48-1 (TR+) Always Below 1Ω U8-2 (ACT+) - Body ground Always 10 kΩ or higher U8-3 (D+) - G49-25 (BCTY) Always Below 1Ω U8-3 (D+) - Body ground Always 10 kΩ or higher U8-1 (ACT-) - Body ground Always Below 1Ω

   
   
   • OKClick here
   • NGClick here
5. Click here

   REPLACE MAIN BODY ECUClick here

6. Click here

   REPLACE BACK DOOR LOCK ASSEMBLYClick here

7. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR

8. Click here

   GO TO BACK DOOR CLOSER SYSTEMClick here

9. Click here

   GO TO SMART ENTRY AND START SYSTEMClick here