54A-THE DRIVER'S DOOR LOCK ACTUATOR SWITCH SIGNAL IS NOT SENT TO THE ETACS-ECU.

Inspection Procedure 4: ETACS-ECU cannot receive the signal of front door lock actuator (LH) or front door lock actuator (RH).

COMMENTS ON TROUBLE SYMPTOM

The front door lock actuator (LH) or front door lock actuator (RH) <vehicles with KOS> input signal is used for the operation judgment of the functions below. If the signal is abnormal, these functions will not work normally.

Key reminder function
Central door locking
KOS
Keyless entry system
Interior light

PROBABLE CAUSES

The front door lock actuator (LH) may be defective
The front door lock actuator (RH) may be defective <vehicles with KOS>
The ETACS-ECU may be defective
The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:

MB991223: Harness Set
MB992006: Extra Fine Probe

STEP 1. Using scan tool MB991958, check data list.

Check the input signals from the front door lock actuators.

(1)

caution

To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III)

(2) Turn the ignition switch to the "ON" position.

(3) Check the ETACS data list.

Set the driver's door to "UNLOCK."

Item No.	Item name	Normal condition
Item 271	Dr door unlock switch	Unlock

Set the front passenger's door to "UNLOCK." <vehicles with KOS>

Item No.	Item name	Normal condition
Item 272	As door unlock switch	Unlock

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Are normal conditions displayed on the "Dr door unlock switch" and "As door unlock switch"?

<Normal conditions are displayed for all the items> : No action is necessary and testing is complete.

<Normal condition is not displayed for item No.271> : Go to Step 2.

<Normal condition is not displayed for item No.272> : Go to Step 8.

STEP 2. Check front door lock actuator (LH) connector F-14 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Is front door lock actuator (LH) connector F-14 in good condition?

Go to Step 3.

Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection

. Check that the input signal of front door lock actuator (LH) is normal.

STEP 3. Check the front door lock actuator (LH).

Disconnect front door lock actuator (LH) connector F-14. Then check continuity between the terminals.

Lever position	Tester connection	Specified condition
UNLOCK	6 - 8	Less than 2 ohms
LOCK	6 - 8	Open circuit

Is the front door lock actuator (LH) in good condition?

Go to Step 4.

Replace the front door lock actuator (LH). Check that the input signal of front door lock actuator (LH) is normal.

STEP 4. Check the ground circuit to the front door lock actuator (LH). Measure the resistance at front door lock actuator (LH) connector F-14.

(1) Disconnect front door lock actuator (LH) connector F-14 and measure the resistance available at the wiring harness side of the connector.

(2) Measure the resistance value between terminal 6 and ground.

The resistance should be 2 ohms or less.

Is the measured resistance 2 ohms or less?

Go to Step 6.

Go to Step 5.

STEP 5. Check the wiring harness between front door lock actuator (LH) connector F-14 (terminal 6) and ground.

Check the ground wires for open circuit.

note	Also check intermediate connector C-224 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-224 is damaged, repair or replace the connector as described in GROUP 00E, Harness Connector Inspection .

Is the wiring harness between front door lock actuator (LH) connector F-14 (terminal 6) and ground in good condition?

No action is necessary and testing is complete.

The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Check that the input signal of front door lock actuator (LH) is normal.

STEP 6. Check ETACS-ECU connector C-411 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Is ETACS-ECU connector C-411 in good condition?

Go to Step 7.

Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection

. Check that the input signal of front door lock actuator (LH) is normal.

STEP 7. Check the wiring harness between front door lock actuator (LH) connector F-14 (terminal 8) and ETACS-ECU connector C-411 (terminal 22).

Check the input lines for open circuit and short circuit.

note	Also check intermediate connector C-225 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-225 is damaged, repair or replace the connector as described in GROUP 00E, Harness Connector Inspection .

Is the wiring harness between front door lock actuator (LH) connector F-14 (terminal 8) and ETACS-ECU connector C-411 (terminal 22) in good condition?

Replace the ETACS-ECU. Check that the input signal of front door lock actuator (LH) is normal.

STEP 8. Check front door lock actuator (RH) connector F-06 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Is front door lock actuator (RH) connector F-06 in good condition?

Go to Step 9.

Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection

. Check that the input signal of front door lock actuator (RH) is normal.

STEP 9. Check the front door lock actuator (RH).

Disconnect front door lock actuator (RH) connector F-06. Then check continuity between the terminals.

Lever position	Tester connection	Specified condition
UNLOCK	7 - 9	Less than 2 ohms
LOCK	7 - 9	Open circuit

Is the front door lock actuator (RH) in good condition?

Go to Step 10.

Replace the front door lock actuator (RH). Check that the input signal of front door lock actuator (RH) is normal.

STEP 10. Check the ground circuit to the front door lock actuator (RH). Measure the resistance at front door lock actuator (RH) connector F-06.

(1) Disconnect front door lock actuator (RH) connector F-06 and measure the resistance available at the wiring harness side of the connector.

(2) Measure the resistance value between terminal 9 and ground.

The resistance should be 2 ohms or less.

Is the measured resistance 2 ohms or less?

Go to Step 12.

Go to Step 11.

STEP 11. Check the wiring harness between front door lock actuator (RH) connector F-06 (terminal 9) and ground.

Check the ground wires for open circuit.

note	Also check intermediate connector C-211 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-211 is damaged, repair or replace the connector as described in GROUP 00E, Harness Connector Inspection .

Is the wiring harness between front door lock actuator (RH) connector F-06 (terminal 9) and ground in good condition?

No action is necessary and testing is complete.

STEP 12. Check ETACS-ECU connector C-411 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Is ETACS-ECU connector C-411 in good condition?

Go to Step 13.

Repair or replace the damaged component(s). Refer to GROUP 00E, Harness Connector Inspection

. Check that the input signal of front door lock actuator (RH) is normal.

STEP 13. Check the wiring harness between front door lock actuator (RH) connector F-06 (terminal 7) and ETACS-ECU connector C-411 (terminal 10).

Check the input lines for open circuit and short circuit.

note	Also check intermediate connector C-212 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-212 is damaged, repair or replace the connector as described in GROUP 00E, Harness Connector Inspection .

Is the wiring harness between front door lock actuator (RH) connector F-06 (terminal 7) and ETACS-ECU connector C-411 (terminal 10) in good condition?

Replace the ETACS-ECU. Check that the input signal of front door lock actuator (RH) is normal.