POWER BACK DOOR SYSTEM Power Back Door Warning System does not Operate

DESCRIPTION

When the power back door warning system does not operate, one of the following may be malfunctioning: 1) power back door warning buzzer circuit, 2) wireless door lock control system, or 3) power back door drive unit (power back door ECU).

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK OPERATION

   
   

   1. Check the power back door system operation.

      Result
      Result Proceed to Power back door warning buzzer does not operate. A Hazard warning light does not come on. B Power back door warning buzzer in the power back door ECU does not operate. C

   
   

   B

   CHECK WIRELESS DOOR LOCK CONTROL SYSTEM (HAZARD ANSWER-BACK FUNCTION) Click here

   C

   REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU) Click here

   A

2. PERFORM ACTIVE TEST ON INTELLIGENT TESTER

   
   

   1. Select the Active Test, use the intelligent tester to generate a control command, and check that the power back door buzzer sounds.

      Back door (Power back door ECU)

      Tester Display	Test Part	Control Range	Diagnostic Note
      PBD Buzzer	Power back door buzzer sound	ON / OFF	-

      OK
      Buzzer sounds normally.

   
   

   NG

   INSPECT POWER BACK DOOR WARNING BUZZER Click here

   OK

   REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU) Click here

3. INSPECT POWER BACK DOOR WARNING BUZZER

   
   

   1. 

      Remove the power back door warning buzzer. Click here

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

      Standard resistance
      Tester Connection Condition Specified Condition 1 - 2 Always 950 to 1050 Ω

   
   

   NG

   REPLACE POWER BACK DOOR WARNING BUZZER Click here

   OK

4. CHECK HARNESS AND CONNECTOR (POWER BACK DOOR WARNING BUZZER - POWER BACK DOOR ECU)

   
   

   1. 

      Disconnect the T9 buzzer connector.

   2. Disconnect the O14 ECU connector.

   3. Disconnect the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition T9-1 - O14-26 (BZR+) Always Below 1 Ω T9-2 - Body ground Always Below 1 Ω T9-1 - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU) Click here

5. CHECK WIRELESS DOOR LOCK CONTROL SYSTEM (HAZARD ANSWER-BACK FUNCTION)

   
   

   1. Check the wireless door lock operation.

      Result
      Result Proceed to Hazard answer-back function operate normally. A Hazard answer-back function does not operate. (w/o Smart Entry and Start System) B Hazard answer-back function does not operate. (w/ Smart Entry and Start System) C

   
   

   B

   GO TO OTHER FLOW CHART (No Answer-Back (w/o Smart Entry and Start System)) Click here

   C

   GO TO OTHER FLOW CHART (No Answer-Back (w/ Smart Entry and Start System)) Click here

   A

6. REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU)

   
   

   1. Replace the power back door drive unit (power back door ECU) Click here.

   
   

   NEXT

7. CHECK POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU)

   
   

   1. Check that the power back door warning buzzer operates normally.

      OK
      It operates normally.

   
   

   NG

   REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

   OK

   END (REPLACE POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU) DEFECTIVE)