Back Door Cannot Be Opened

DOOR / HATCH: BACK DOOR CLOSER SYSTEM: Back Door cannot be Opened

Back Door cannot be Opened

DESCRIPTION

When the back door cannot be opened, one of the following may be the cause: 1) power back door ECU malfunction, 2) back door lock malfunction, 3) back door open switch malfunction, 4) main body ECU malfunction, 5) back door ECU malfunction, 6) power source circuit malfunction, or 7) position SW in prohibit condition. In the case that a fault is detected at the position switch, the back door stops functioning when the door position is full-latch (system prohibits opening of the door). Thereafter, the system prohibits back door operation until it detects a power reset of the ECU.

HINT: Since the power back door system has functions that use CAN and LIN communication, first confirm that there is no malfunction in the communication system by inspecting the CAN and LIN communication functions in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSES (ECU-IG NO.2, ECU-B1, PBD)
(a) Remove the ECU- IG NO.2, ECU-B1 and PBD fuses.

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

Standard Resistance:

(c) Reinstall the fuses.

NG -- CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (POWER SOURCE)
(a) Disconnect the O30 power back door ECU connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

(c) Reconnect the power back door ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (BODY GROUND)
(a) Disconnect the O30 power back door ECU connector.

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

Standard Resistance:

(c) Reconnect the power back door ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Back Door P/W / Data List /
(e) According to the display on the Techstream, read the Data List.

Back Door P/W (Back Door ECU)

OK:
The back door opener switch functions as specified in the normal condition.

NG -- INSPECT BACK DOOR OPENER SWITCH
OK -- Continue to next step.

5. INSPECT BACK DOOR LOCK

(a) Remove the back door lock Removal.
(b) Apply battery voltage and check operation of the door lock motor.

Apply Battery Voltage:

Standard Resistance:

Sector Switch

Standard Resistance:

Back Door Courtesy Light Switch

NG -- REPLACE BACK DOOR LOCK
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - POWER BACK DOOR ECU, BACK DOOR ECU)

(a) Disconnect the V5 back door lock connector.
(b) Disconnect the O30, V2 AND V3 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

(d) Disconnect the back door lock connector.
(e) Disconnect the ECU connector.

Result

B -- REPLACE BACK DOOR ECU
A -- REPAIR OR REPLACE HARNESS OR CONNECTOR
7. INSPECT BACK DOOR OPENER SWITCH

(a) Remove the back door opener switch Disassembly.
(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG -- REPLACE BACK DOOR OPENNER SWITCH
OK -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (BACK DOOR OPENER SWITCH - BACK DOOR ECU)

(a) Disconnect the V6 switch connector.
(b) Disconnect the V3 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

(d) Disconnect the switch and ECU connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

9. REPLACE BACK DOOR ECU
(a) Temporarily replace the back door ECU with a new or normally functioning one Disassembly.
NEXT -- Continue to next step.

10. CHECK BACK DOOR CLOSER SYSTEM (OPERATION)
(a) Check that the back door closer operates normally.
OK:
It operates normally.

NG -- REPLACE POWER BACK DOOR UNIT (POWER BACK DOOR ECU)
OK -- END (BACK DOOR ECU DEFECTIVE)
11. REPLACE POWER BACK DOOR UNIT (POWER BACK DOOR ECU)
(a) Temporarily replace the power back door drive unit (power back door ECU) with a new or normally functioning one Removal.
NEXT -- Continue to next step.

12. CHECK BACK DOOR CLOSER SYSTEM (OPERATION)
(a) Check that the back door closer operates normally.
OK:
It operates normally.

NG -- REPLACE MAIN BODY ECU
OK -- END (POWER BACK DOOR DRIVE UNIT (POWER BACK DOOR ECU) DEFECTIVE)