Last Modified: 11-29-2007 1.6 J
Service Category: Vehicle Exterior Section: Door/Hatch
Model Year: 2008 Model: Sequoia Doc ID: RM00000362P003X
Title: DOOR / HATCH: BACK DOOR CLOSER SYSTEM: DESCRIPTION (2008 Sequoia)

Back Door Closer does not Operate

DESCRIPTION

When the back door closer does not operate, one of the following may be the cause: 1) improper fit of back door, or a foreign object is stuck in back door, or 2) initialization of the power back door ECU, or 3) power back door ECU power source circuit malfunction, or 4) back door lock circuit malfunction, or 5) power back door ECU malfunction.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK BACK DOOR LOCK FUNCTION

(a) Check if the back door is fully closed by hand.

OK

2.

INITIALIZE POWER BACK DOOR ECU

(a) Check that the power back door drive unit (power back door ECU) can be initialized DOOR / HATCH: POWER BACK DOOR SYSTEM: INITIALIZATION (2008 Sequoia) .

NEXT

3.

CHECK BACK DOOR CLOSER SYSTEM

(a) Check that the back door closer system operates normally.

OK:

Back door closer system operates normally.

OK

4.

CHECK DTC OUTPUT

(a) Check for the DTCs DOOR / HATCH: BACK DOOR CLOSER SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

Result

Result

Proceed to

DTC is not output

A

B2250 is output

B

B2251 is output

C
A

5.

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:

Tester Connection

Condition

Specified Condition

ECU-IG NO. 2

Always

Below 1 Ω

ECU-B1

Always

Below 1 Ω

PBD

Always

Below 1 Ω

(c) Reinstall the fuses.

OK

6.

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:

Tester Connection

Switch Condition

Specified Condition

O30-8 (IG) - Body ground

Ignition switch ON

11 to 14 V

O30-10 (ECUB) - Body ground

Always

11 to 14 V

O30-12 (B) - Body ground

Always

11 to 14 V

(c) Reconnect the power back door ECU connector.

OK

7.

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:

Tester Connection

Condition

Specified Condition

O30-11 (GND) - Body ground

Always

Below 1 Ω

(c) Reconnect the power back door ECU connector.

OK

8.

INSPECT BACK DOOR LOCK


(a) Remove the back door lock DOOR LOCK: BACK DOOR LOCK: REMOVAL (2008 Sequoia) .

(b) Apply battery voltage and check the operation of the door lock motor.

Apply Battery Voltage:

Measurement Condition

Specified Condition

Battery positive (+) → Terminal 2 (ACT-)

Battery negative (-) → Terminal 1 (ACT+)

Latch turns to open-latch position

Battery positive (+) → Terminal 1 (ACT+)

Battery negative (-) → Terminal 2 (ACT-)

Latch turns to full-latch position

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

Standard Resistance:

Latch Switch

Tester Connection

Door Lock Latch Position

Specified Condition

5 (CLS) - 3 (E)

Over-latch

Below 1 Ω

5 (CLS) - 3 (E)

Open-latch

10 kΩ or higher

5 (CLS) - 3 (E)

Full-latch

10 kΩ or higher

5 (CLS) - 3 (E)

Half-latch

10 kΩ or higher

Standard Resistance:

Back Door Courtesy Light Switch

Tester Connection

Door Lock Latch Position

Specified Condition

6 (S) - 3 (E)

Over-latch

10 kΩ or higher

6 (S) - 3 (E)

Open-latch

Below 1 Ω

6 (S) - 3 (E)

Full-latch

10 kΩ or higher

6 (S) - 3 (E)

Half-latch

Below 1 Ω
OK

9.

CHECK HARNESS AND CONNECTOR (BACK DOOR LOCK - POWER BACK DOOR ECU AND BODY GROUND)

(a) Disconnect the V5 door lock connector.

(b) Disconnect the O30 ECU connector.

(c) Disconnect the V2 and V3 ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

V5-2 (ACT-) - O30-2 (DC+)

Always

Below 1 Ω

V5-1 (ACT+) - O30-1 (DC-)

Always

Below 1 Ω

V5-5 (CLS) - O30-22 (HAF)

Always

Below 1 Ω

V5-6 (S) - V3-10 (BDCY)

Always

Below 1 Ω

V5-3 (E) - V3-20 (CTYE)

Always

Below 1 Ω

V2-17 (OCTY) - O30-20 (FULL)

Always

Below 1 Ω

O30-2 (DC+) - Body ground

Always

10 kΩ or higher

O30-1 (DC-) - Body ground

Always

10 kΩ or higher

O30-22 (HAF) - Body ground

Always

10 kΩ or higher

O30-20 (FUL) - Body ground

Always

10 kΩ or higher

(e) Reconnect the door lock and ECU connector.

OK

10.

REPLACE POWER BACK DOOR DRIVE 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 DOOR / HATCH: POWER BACK DOOR DRIVE UNIT: REMOVAL (2008 Sequoia) .

NEXT

11.

CHECK BACK DOOR CLOSER SYSTEM (OPERATION)

(a) Check that the back door closer operates normally.

OK:

It operates normally.

OK