Power Back Door Cannot Be Operated Using Any Switch

DOOR / HATCH: POWER BACK DOOR SYSTEM: Power Back Door cannot be Operated Using Any Switch

Power Back Door cannot be Operated Using Any Switch

DESCRIPTION

When the power back door cannot be operated using any switch, one of the following may be the cause: 1) initialization of the power back door ECU (power back door motor unit), 2) power back door touch sensor circuit, 3) power back door main switch circuit, 4) back door closer system, 5) meter/gauge system, 6) main body ECU (driver side junction block assembly) or 7) power back door ECU (power back door motor unit).

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INITIALIZE POWER BACK DOOR ECU
(a) Perform the initialization for the power back door ECU (power back door motor unit) Initialization.
NEXT -- Continue to next step.

2. CHECK POWER BACK DOOR SYSTEM
(a) Check the power back door system operation Operation Check.
OK:
Power back door system operates normally.

NG -- CHECK BACK DOOR CLOSER SYSTEM
OK -- END
3. CHECK BACK DOOR CLOSER SYSTEM
(a) Check back door closer system operation Operation Check.
OK:
Back door closer system operates normally.

NG -- GO TO BACK DOOR CLOSER SYSTEM
OK -- Continue to next step.

4. CHECK COMBINATION METER ASSY
(a) Check shift position indicator operation and that the speedometer indicates 0 mph when the vehicle is stopped and the engine idling.
OK:
Combination meter operates normally.

NG -- GO TO METER/GAUGE SYSTEM
OK -- Continue to next step.

5. CHECK DTC OUTPUT
(a) Check for DTCs Power Back Door System.
Result:





E -- GO TO OTHER FLOW CHART (B2251)
D -- GO TO OTHER FLOW CHART (B2250)
C -- GO TO OTHER FLOW CHART (B2225)
B -- GO TO OTHER FLOW CHART (B2222)
A -- Continue to next step.

6. READ VALUE USING TECHSTREAM (BACK DOOR LOCK ASSEMBLY)
(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 / Main Body / Data List.
(e) Check the Data List to determine if the back door lock assembly functions properly.

Main Body (Main Body ECU (Driver Side Junction Block Assembly))





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

NG -- REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)
OK -- Continue to next step.

7. READ VALUE USING TECHSTREAM (BACK DOOR LOCK ASSEMBLY)
(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 / Data List.
(e) Check the Data List to determine if the back door lock assembly functions properly.

Back Door (Power Back Door ECU)





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

NG -- REPLACE POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT)
OK -- Continue to next step.

8. READ VALUE USING TECHSTREAM (POWER BACK DOOR TOUCH SENSOR)
(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 / Data List.
(e) Check the Data List to determine if the power back door touch sensor functions properly.

Back Door (Power Back Door ECU)





Result:





B -- GO TO OTHER FLOW CHART (TOUCH SENSOR CIRCUIT)
A -- Continue to next step.

9. READ VALUE USING TECHSTREAM (POWER BACK DOOR MAIN SWITCH)
(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 / Data List.
(e) Check the Data List to determine if the power back door main switch functions properly.

Back Door (Power Back Door ECU)





OK:
The power back door main switch functions as specified in the normal condition column.

NG -- INSPECT POWER BACK DOOR MAIN SWITCH
OK -- REPLACE POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT)
10. INSPECT POWER BACK DOOR MAIN SWITCH




(a) Remove the power back door main switch Smart Key System (for Start Function).
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






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

11. CHECK HARNESS AND CONNECTOR (POWER BACK DOOR MAIN SWITCH - POWER BACK DOOR ECU)




(a) Disconnect the D45 power back door main switch connector and L20 power back door ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE POWER BACK DOOR ECU (POWER BACK DOOR MOTOR UNIT)